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What is pruritus (itchy skin)? Pruritus is the medical term for itchy skin. Normally, itchy skin isn’t serious, but it can make you uncomfortable. Sometimes, itchy skin is caused by a serious medic...

What is pseudogout? Pseudogout is a type of arthritis that causes painful swelling in one or more of your joints. It can lead to joint damage if left untreated. Pseudogout is similar to a condition...

What is pulmonary hypertension? “Pulmonary” means “in the lungs,” and “hypertension” means “high blood pressure.” Pulmonary hypertension is an increase in pressure in the blood vessels that carry b...

What is Raynaud’s disease? Raynaud’s disease is a rare condition. It is a temporary narrowing of your blood vessels caused by spasm. The condition affects the blood to your skin, mainly to your fin...

What is pica? Pica is a compulsive eating disorder in which people eat nonfood items. Dirt, clay, and flaking paint are the most common items eaten. Less common items include glue, hair, cigarette ...

What is a pilonidal cyst? A pilonidal cyst is a small sac that sticks up from inside the skin. It’s usually located near the tailbone at the top of the buttocks crease. These cysts can contain hair...

What is pinworm infection? Pinworm infection is an intestinal infection caused by small, white worms. Anyone can get it, but it’s most common in young children. It’s easily treated. Symptoms of pin...

What is piriformis syndrome? Your piriformis muscle runs from your lower spine to the top of your thigh bone. Piriformis syndrome occurs when this muscle presses on your sciatic nerve (the nerve th...

What is plagiocephaly? Plagiocephaly is a condition where your baby’s head has a flat spot or is misshapen. There are various levels of severity and can occur during pregnancy or after birth. There...

What is plantar fasciitis? Plantar fasciitis is an inflammatory condition. It occurs in the plantar fascia, which is a band of tissue that runs along the bottom of your foot. The plantar fascia wor...