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The most common cause for menstrual irregularities is when a woman's ovaries don't release an egg.

Mitochondrial disease is not a single disorder but an umbrella term for dozens of individual disorders in which the body’s cells have problems producing energy.

Moyamoya is a rare condition in which the blood vessels (internal carotid arteries) that supply blood to the brain become narrowed.

Multicystic dysplastic kidney is a condition in which the kidney has been essentially replaced by multiple cysts.

Mumps is a very contagious viral illness that usually makes a child have a fever and swollen salivary glands in his mouth and near his ear.

Children with myopia (nearsightedness) can see close up, but have problems seeing things far away.

Myeloproliferative neoplasms (MPNs) are a rare, closely related group of blood disorders in which the bone marrow overproduces red blood cells, white blood cells, or platelets.

Niemann-Pick disease is a rare genetic condition that affects many of the body’s organs and systems, including the central nervous system.

Necrotizing enterocolitis (NEC) is a serious intestinal illness in babies that results in the death of intestinal tissues.

Nervous system disorders can involve a range of conditions that may be chronic or may be triggered by secondary factors.