This disorder includes nervous system symptoms affecting movement or the senses that are not caused by medical disease. Treatment can help with recovery.
Disease
Post-traumatic stress disorder (PTSD)
This mental health condition, which is caused by being part of or witnessing a terrifying event, leads to symptoms that include flashbacks, nightmares and severe anxiety.
Disease
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Find out what treatments and prevention tips can help.
Disease
Klinefelter syndrome
In this condition, a genetic male has an extra X sex chromosome. This may affect the growth of testicles and result in low testosterone.
Disease
Thalassemia
Some forms of this inherited blood disorder usually show up before the age of 2. Often, they cause anemia. Worse forms of the disease require regular blood transfusions.
Disease
Norovirus infection
This highly contagious virus spreads through contaminated food, water or surfaces and causes vomiting and diarrhea. Learn ways to protect yourself.
Disease
Porphyria
This group of disorders results from a buildup of natural chemicals in the body that affect the nervous system and skin. Learn how to avoid symptom triggers.
Disease
Peutz-Jeghers syndrome
This inherited condition causes polyps to grow in the digestive tract and increases the risk of cancer. Regular screening helps reduce some risks.
Disease
Adrenoleukodystrophy
Find out about diagnosis and treatment of adrenoleukodystrophy — a hereditary disorder that affects the brain, nervous system and adrenal gland.
Disease
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Disease
Mumps
Find out more about the symptoms and treatment of this viral illness and how vaccines can prevent it.
Disease
Toe walking in children
Walking on toes or the balls of the feet is fairly common in children who are learning to walk. Most children outgrow it.