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This test measures the amount of uric acid in the fluid of your joints. The test can help your doctor find out if you have gout, a type of arthritis.

Pheochromocytoma is a tumor of the adrenal glands. The tumor makes hormones called epinephrine and norepinephrine. This leads to an excess of the hormones in the body. These hormones help manage heart rate and blood pressure, and they have other tasks. Too much of these hormones in the body causes problems.

Diabetes is a condition in which the body can't make enough insulin, or can't use insulin normally. Type 1 diabetes is an autoimmune disorder. The body's immune system damages the cells in the pancreas that make insulin. Insulin is a hormone. It helps sugar (glucose) in the blood get into cells of the body to be used as fuel. When glucose can’t enter the cells, it builds up in the blood. This is called high blood sugar (hyperglycemia).

Addison disease is when the adrenal glands don't make enough of two steroid hormones. The hormones are cortisol and aldosterone. Cortisol controls the body's metabolism, blocks inflammatory reactions, and affects the immune system. Aldosterone manages sodium and potassium levels. Addison disease is fairly rare and may first appear at any age.

Biliary atresia is a rare liver disease that occurs in infants. It is often found shortly after birth. The disorder affects tubes in the liver called bile ducts. If not treated with surgery, it can be fatal.

Endoscopic sinus surgery is a procedure to open the passages of the nose and sinuses. It is done to treat long-term (chronic) sinus infections. An ear, nose, and throat specialist (ENT) does the surgery.

A pilomatrixoma is a slow-growing, noncancerous skin tumor of the hair follicle. It's most common on the face and neck, and it's more common in children and young adults. Read on to learn more.

Skin cancer is a type of cancer that grows in the cells of the skin. It can spread to and damage nearby tissue and spread to other parts of the body. Skin cancer is rare in children.

Ticks attach themselves to the scalp, behind the ear, in the armpit and groin, and also between fingers and toes. Find out what to do if you find a tick on your child.