describes uncommon conditions that mainly affect learning, development, and daily skills.

is an uncommon bowel condition that can affect digestion and overall health.

is poisoning caused by medicines or other medical products.

is a rare inherited nearsightedness affecting vision without other health problems.

is a group of uncommon eye conditions affecting the lens and vision.

is an uncommon inflammatory condition causing itchy skin, mouth, or genital lesions.

is a rare disorder where abnormal lymph vessels form fluid-filled swellings.

is a rare disorder of the lymphatic system causing abnormal fluid-filled channels.

is a rare eye condition affecting the macula and central vision.

is an uncommon condition that can make it harder to father a child.

is infertility linked to an adrenal gland disorder affecting hormone production.

is a rare inherited adrenal disorder that can cause male infertility.

causes male infertility when brain-to-testes hormone signaling does not work properly.

is a genetic hormone disorder causing rare male infertility.

is a rare hormonal testicular disorder that can cause male infertility.

is a rare cancerous breast tumor that often grows quickly.

is a rare cancer arising in the liver or bile ducts.

is a rare condition affecting the face and jaws, sometimes needing surgery.

is a group of inherited disorders that affect liver metabolism.

is a rare inherited mitochondrial condition causing permanent inner ear hearing loss.

is an uncommon condition that affects movement, balance, and daily activities.

is a rare inflammatory condition affecting the mouth, genitals, or other linings.

is a rare fungal infection that can affect skin, lungs, or organs.

causes sudden, brief involuntary muscle jerks and may have many causes.