This is a list of diseases starting with the letter "X".

• X, disease
• X chromosome, duplication Xq13 1 q21 1
• X chromosome, monosomy Xp22 pter
• X chromosome, monosomy Xq28
• X chromosome, trisomy Xp3
• X chromosome, trisomy Xpter Xq13
• X chromosome, trisomy Xq
• X chromosome, trisomy Xq25
• X fragile site folic acid type

• Xanthic urolithiasis
• Xanthine oxydase deficiency
• Xanthinuria
• Xanthomatosis cerebrotendinous
• Xerocytosis, hereditary
• Xeroderma
• Xeroderma pigmentosum
  • Xeroderma pigmentosum, type 1
  • Xeroderma pigmentosum, type 2
  • Xeroderma pigmentosum, type 3
  • Xeroderma pigmentosum, type 5
  • Xeroderma pigmentosum, type 6
  • Xeroderma pigmentosum, type 7
  • Xeroderma pigmentosum, variant type
• Xeroderma talipes enamel defects
• Xerophthalmia
• Xerostomia
• Xk aprosencephaly

• X-linked adrenal hypoplasia congenita
• X-linked adrenoleukodystrophy
• X-linked agammaglobulinemia
• X-linked alpha thalassemia mental retardation syndrome (ATR-X)
• X-linked dominance
• X-linked ichthyosis
• X-linked juvenile retinoschisis
• X-linked lymphoproliferative syndrome
• X-linked mental retardation

• X-linked mental retardation and macroorchidism
• X-linked mental retardation associated with marXq2
• X-linked mental retardation Brooks type
• X-linked mental retardation craniofacial abnormal microcephaly club
• X-linked mental retardation De silva type
• X-linked mental retardation Hamel type
• X-linked mental retardation type Gustavson
• X-linked mental retardation type Martinez
• X-linked mental retardation type Raynaud
• X-linked mental retardation type Schutz
• X-linked mental retardation type Snyder
• X-linked mental retardation type Wittner

• X-linked mental retardation-hypotonia
• X-linked severe combined immunodeficiency
• X-linked trait

• XX male syndrome
• XY Female
• XY gonadal agenesis syndrome
• XYY syndrome
• XXXX syndrome
• XXXXX syndrome