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<span>Genetic Conditions: X</span>
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<h1>Genetic Conditions: X</h1>
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<p>Explore the signs and symptoms, genetic cause, and inheritance pattern of various health conditions.</p>
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<span class='blue-label'>Other genetic conditions A-Z</span>
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<ul class="alpha-links">
<li><a href="https://medlineplus.gov/genetics/condition-0/" data-alpha="0-9">0-9</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/" data-alpha="A">A</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-b/" data-alpha="B">B</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-c/" data-alpha="C">C</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-d/" data-alpha="D">D</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-e/" data-alpha="E">E</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-f/" data-alpha="F">F</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-g/" data-alpha="G">G</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-h/" data-alpha="H">H</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-i/" data-alpha="I">I</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-j/" data-alpha="J">J</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-k/" data-alpha="K">K</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-l/" data-alpha="L">L</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-m/" data-alpha="M">M</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-n/" data-alpha="N">N</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-o/" data-alpha="O">O</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-p/" data-alpha="P">P</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-q/" data-alpha="Q">Q</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-r/" data-alpha="R">R</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-s/" data-alpha="S">S</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-t/" data-alpha="T">T</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-u/" data-alpha="U">U</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-v/" data-alpha="V">V</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-w/" data-alpha="W">W</a></li>
<li><span class="active">X</span></li>
<li><a href="https://medlineplus.gov/genetics/condition-y/" data-alpha="Y">Y</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-z/" data-alpha="Z">Z</a></li>
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<section>
<ul class="withident breaklist">
<li>X chromosome-linked sideroblastic anemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-sideroblastic-anemia/">X-linked sideroblastic anemia</a></li>
<li>X linked recessive hereditary spastic paraplegia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/spastic-paraplegia-type-2/">Spastic paraplegia type 2</a></li>
<li>X-ALD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-adrenoleukodystrophy/">X-linked adrenoleukodystrophy</a></li>
<li>X-LAG, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-acrogigantism/">X-linked acrogigantism</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-acrogigantism/">X-linked acrogigantism</a></li>
<li>X-linked acrogigantism syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-acrogigantism/">X-linked acrogigantism</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-adrenal-hypoplasia-congenita/">X-linked adrenal hypoplasia congenita</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-adrenoleukodystrophy/">X-linked adrenoleukodystrophy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-agammaglobulinemia/">X-linked agammaglobulinemia</a></li>
<li>X-linked AHC, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-adrenal-hypoplasia-congenita/">X-linked adrenal hypoplasia congenita</a></li>
<li>X-linked alpha-thalassemia/mental retardation syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/alpha-thalassemia-x-linked-intellectual-disability-syndrome/">Alpha thalassemia X-linked intellectual disability syndrome</a></li>
<li>X-linked arthrogryposis multiplex congenita, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-spinal-muscular-atrophy/">X-linked infantile spinal muscular atrophy</a></li>
<li>X-linked arthrogryposis type I, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-spinal-muscular-atrophy/">X-linked infantile spinal muscular atrophy</a></li>
<li>X-linked autoimmunity-allergic dysregulation syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-dysregulation-polyendocrinopathy-enteropathy-x-linked-syndrome/">Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-cardiac-valvular-dysplasia/">X-linked cardiac valvular dysplasia</a></li>
<li>X-linked centronuclear myopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-myotubular-myopathy/">X-linked myotubular myopathy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-chondrodysplasia-punctata-1/">X-linked chondrodysplasia punctata 1</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-chondrodysplasia-punctata-2/">X-linked chondrodysplasia punctata 2</a></li>
<li>X-linked chronic granulomatous disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/chronic-granulomatous-disease/">Chronic granulomatous disease</a></li>
<li>X-linked congenital nystagmus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-nystagmus/">X-linked infantile nystagmus</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-congenital-stationary-night-blindness/">X-linked congenital stationary night blindness</a></li>
<li>X-linked copper deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/menkes-syndrome/">Menkes syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-creatine-deficiency/">X-linked creatine deficiency</a></li>
<li>X-linked creatine deficiency syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-creatine-deficiency/">X-linked creatine deficiency</a></li>
<li>X-linked CSNB, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-congenital-stationary-night-blindness/">X-linked congenital stationary night blindness</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-dilated-cardiomyopathy/">X-linked dilated cardiomyopathy</a></li>
<li>X-linked dominant chondrodysplasia punctata, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-chondrodysplasia-punctata-2/">X-linked chondrodysplasia punctata 2</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-dystonia-parkinsonism/">X-linked dystonia-parkinsonism</a></li>
<li>X-linked dystonia-parkinsonism syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-dystonia-parkinsonism/">X-linked dystonia-parkinsonism</a></li>
<li>X-linked hydrocephalus syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/l1-syndrome/">L1 syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-hyper-igm-syndrome/">X-linked hyper IgM syndrome</a></li>
<li>X-linked hypergonadotropic ovarian failure, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/fragile-x-associated-primary-ovarian-insufficiency/">Fragile X-associated primary ovarian insufficiency</a></li>
<li>X-linked hyperuricemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lesch-nyhan-syndrome/">Lesch-Nyhan syndrome</a></li>
<li>X-linked idiopathic infantile nystagmus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-nystagmus/">X-linked infantile nystagmus</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-immunodeficiency-with-magnesium-defect-epstein-barr-virus-infection-and-neoplasia/">X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection, and neoplasia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-nystagmus/">X-linked infantile nystagmus</a></li>
<li>X-linked infantile spasm syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/developmental-and-epileptic-encephalopathy-1/">Developmental and epileptic encephalopathy 1</a></li>
<li>X-linked infantile spasm syndrome 1, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/developmental-and-epileptic-encephalopathy-1/">Developmental and epileptic encephalopathy 1</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-spinal-muscular-atrophy/">X-linked infantile spinal muscular atrophy</a></li>
<li>X-linked intellectual deficit due to PQBP1 mutations, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/renpenning-syndrome/">Renpenning syndrome</a></li>
<li>X-linked intellectual deficit with marfanoid habitus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lujan-syndrome/">Lujan syndrome</a></li>
<li>X-linked intellectual deficit, Najm type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/cask-related-intellectual-disability/">CASK-related intellectual disability</a></li>
<li>X-linked intellectual deficit, Renpenning type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/renpenning-syndrome/">Renpenning syndrome</a></li>
<li>X-linked intellectual deficit-dystonia-dysarthria, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/partington-syndrome/">Partington syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-intellectual-disability-siderius-type/">X-linked intellectual disability, Siderius type</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-juvenile-retinoschisis/">X-linked juvenile retinoschisis</a></li>
<li>X-linked lethal infantile SMA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-spinal-muscular-atrophy/">X-linked infantile spinal muscular atrophy</a></li>
<li>X-linked lissencephaly 2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-lissencephaly-with-abnormal-genitalia/">X-linked lissencephaly with abnormal genitalia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-lissencephaly-with-abnormal-genitalia/">X-linked lissencephaly with abnormal genitalia</a></li>
<li>X-linked lissencephaly with ambiguous genitalia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-lissencephaly-with-abnormal-genitalia/">X-linked lissencephaly with abnormal genitalia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-lymphoproliferative-disease/">X-linked lymphoproliferative disease</a></li>
<li>X-linked lymphoproliferative syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-lymphoproliferative-disease/">X-linked lymphoproliferative disease</a></li>
<li>X-linked macrothrombocytopenia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/dyserythropoietic-anemia-and-thrombocytopenia/">Dyserythropoietic anemia and thrombocytopenia</a></li>
<li>X-linked mental retardation and macroorchidism, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/fragile-x-syndrome/">Fragile X syndrome</a></li>
<li>X-linked mental retardation Hamel type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-intellectual-disability-siderius-type/">X-linked intellectual disability, Siderius type</a></li>
<li>X-linked mental retardation Siderius type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-intellectual-disability-siderius-type/">X-linked intellectual disability, Siderius type</a></li>
<li>X-linked mental retardation with dystonic movements, ataxia, and seizures, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/partington-syndrome/">Partington syndrome</a></li>
<li>X-linked mental retardation with marfanoid habitus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lujan-syndrome/">Lujan syndrome</a></li>
<li>X-linked mental retardation, syndromic 13, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ppm-x-syndrome/">PPM-X syndrome</a></li>
<li>X-linked monoamine oxidase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/monoamine-oxidase-a-deficiency/">Monoamine oxidase A deficiency</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-myotubular-myopathy/">X-linked myotubular myopathy</a></li>
<li>X-linked myxomatous valvular dystrophy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-cardiac-valvular-dysplasia/">X-linked cardiac valvular dysplasia</a></li>
<li>X-linked Ohdo syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ohdo-syndrome-maat-kievit-brunner-type/">Ohdo syndrome, Maat-Kievit-Brunner type</a></li>
<li>X-linked Ohtahara syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/developmental-and-epileptic-encephalopathy-1/">Developmental and epileptic encephalopathy 1</a></li>
<li>X-linked primary hyperuricemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lesch-nyhan-syndrome/">Lesch-Nyhan syndrome</a></li>
<li>X-linked pseudoglycogenosis II, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/danon-disease/">Danon disease</a></li>
<li>X-linked pyridoxine-responsive sideroblastic anemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-sideroblastic-anemia/">X-linked sideroblastic anemia</a></li>
<li>X-linked recessive chondrodysplasia punctata 1, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-chondrodysplasia-punctata-1/">X-linked chondrodysplasia punctata 1</a></li>
<li>X-linked retinoschisis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-juvenile-retinoschisis/">X-linked juvenile retinoschisis</a></li>
<li>X-linked SCID, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-severe-combined-immunodeficiency/">X-linked severe combined immunodeficiency</a></li>
<li>X-linked SED, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-spondyloepiphyseal-dysplasia-tarda/">X-linked spondyloepiphyseal dysplasia tarda</a></li>
<li>X-linked SEDT, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-spondyloepiphyseal-dysplasia-tarda/">X-linked spondyloepiphyseal dysplasia tarda</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-severe-combined-immunodeficiency/">X-linked severe combined immunodeficiency</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-sideroblastic-anemia/">X-linked sideroblastic anemia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-sideroblastic-anemia-and-ataxia/">X-linked sideroblastic anemia and ataxia</a></li>
<li>X-linked spinal and bulbar muscular atrophy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/spinal-and-bulbar-muscular-atrophy/">Spinal and bulbar muscular atrophy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-spondyloepiphyseal-dysplasia-tarda/">X-linked spondyloepiphyseal dysplasia tarda</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/x-linked-thrombocytopenia/">X-linked thrombocytopenia</a></li>
<li>X-linked torsion dystonia-parkinsonism syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-dystonia-parkinsonism/">X-linked dystonia-parkinsonism</a></li>
<li>X-linked uric aciduria enzyme defect, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lesch-nyhan-syndrome/">Lesch-Nyhan syndrome</a></li>
<li>X-linked vacuolar cardiomyopathy and myopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/danon-disease/">Danon disease</a></li>
<li>X-linked West syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/developmental-and-epileptic-encephalopathy-1/">Developmental and epileptic encephalopathy 1</a></li>
<li>X-SCID, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-severe-combined-immunodeficiency/">X-linked severe combined immunodeficiency</a></li>
<li>Xanthine dehydrogenase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hereditary-xanthinuria/">Hereditary xanthinuria</a></li>
<li>Xanthine oxidase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hereditary-xanthinuria/">Hereditary xanthinuria</a></li>
<li>Xanthinuria, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hereditary-xanthinuria/">Hereditary xanthinuria</a></li>
<li>XDH deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hereditary-xanthinuria/">Hereditary xanthinuria</a></li>
<li>XDP, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-dystonia-parkinsonism/">X-linked dystonia-parkinsonism</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/xeroderma-pigmentosum/">Xeroderma pigmentosum</a></li>
<li>XGS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/xia-gibbs-syndrome/">Xia-Gibbs syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/xia-gibbs-syndrome/">Xia-Gibbs syndrome</a></li>
<li>XJR, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-juvenile-retinoschisis/">X-linked juvenile retinoschisis</a></li>
<li>XL-SMA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-spinal-muscular-atrophy/">X-linked infantile spinal muscular atrophy</a></li>
<li>XLAAD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-dysregulation-polyendocrinopathy-enteropathy-x-linked-syndrome/">Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome</a></li>
<li>XLAG, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-acrogigantism/">X-linked acrogigantism</a></li>
<li>XLAG, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-lissencephaly-with-abnormal-genitalia/">X-linked lissencephaly with abnormal genitalia</a></li>
<li>XLCM, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-dilated-cardiomyopathy/">X-linked dilated cardiomyopathy</a></li>
<li>XLCSNB, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-congenital-stationary-night-blindness/">X-linked congenital stationary night blindness</a></li>
<li>XLDC, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-dilated-cardiomyopathy/">X-linked dilated cardiomyopathy</a></li>
<li>XLISG, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-lissencephaly-with-abnormal-genitalia/">X-linked lissencephaly with abnormal genitalia</a></li>
<li>XLMR with marfanoid features, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lujan-syndrome/">Lujan syndrome</a></li>
<li>XLMR-hypotonic face syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/alpha-thalassemia-x-linked-intellectual-disability-syndrome/">Alpha thalassemia X-linked intellectual disability syndrome</a></li>
<li>XLMTM, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-myotubular-myopathy/">X-linked myotubular myopathy</a></li>
<li>XLOA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ocular-albinism/">Ocular albinism</a></li>
<li>XLP, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-lymphoproliferative-disease/">X-linked lymphoproliferative disease</a></li>
<li>XLSA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-sideroblastic-anemia/">X-linked sideroblastic anemia</a></li>
<li>XLSA/A, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-sideroblastic-anemia-and-ataxia/">X-linked sideroblastic anemia and ataxia</a></li>
<li>XLSMA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-spinal-muscular-atrophy/">X-linked infantile spinal muscular atrophy</a></li>
<li>XLT, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-thrombocytopenia/">X-linked thrombocytopenia</a></li>
<li>XMEN, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-immunodeficiency-with-magnesium-defect-epstein-barr-virus-infection-and-neoplasia/">X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection, and neoplasia</a></li>
<li>XMTM, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-myotubular-myopathy/">X-linked myotubular myopathy</a></li>
<li>XMVD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-cardiac-valvular-dysplasia/">X-linked cardiac valvular dysplasia</a></li>
<li>XP, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/xeroderma-pigmentosum/">Xeroderma pigmentosum</a></li>
<li>XSCID, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-severe-combined-immunodeficiency/">X-linked severe combined immunodeficiency</a></li>
<li>XX male syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/46xx-testicular-difference-of-sex-development/">46,XX testicular difference of sex development</a></li>
<li>XXX syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/trisomy-x/">Trisomy X</a></li>
<li>XXXXY aneuploidy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/49xxxxy-syndrome/">49,XXXXY syndrome</a></li>
<li>XXXXY syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/49xxxxy-syndrome/">49,XXXXY syndrome</a></li>
<li>XXXY males, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/48xxxy-syndrome/">48,XXXY syndrome</a></li>
<li>XXXY syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/48xxxy-syndrome/">48,XXXY syndrome</a></li>
<li>XXY syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/klinefelter-syndrome/">Klinefelter syndrome</a></li>
<li>XXY trisomy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/klinefelter-syndrome/">Klinefelter syndrome</a></li>
<li>XXYY syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/48xxyy-syndrome/">48,XXYY syndrome</a></li>
<li>XY pure gonadal dysgenesis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/swyer-syndrome/">Swyer syndrome</a></li>
<li>Xylitol dehydrogenase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/essential-pentosuria/">Essential pentosuria</a></li>
<li>XYY karyotype, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/47xyy-syndrome/">47,XYY syndrome</a></li>
<li>XYY syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/47xyy-syndrome/">47,XYY syndrome</a></li>
</ul>
</section>
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