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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «P»:

  1. Pilonidal cyst Pilonidal cyst
    A pilonidal cyst is a small pit, or dimpled area that can occur anywhere along the crease between the buttocks (sacral area). Considerations Most pilonidal cysts are pits or small depressions that are present from birth. They may range from a small dimple to a deep tract with hair in or around it.T...
  2. Pinguecula Pinguecula
    A pinguecula is a common, non-cancerous growth of the mucus membrane lining the eyeball and underside of the eyelids (conjunctiva). Causes The cause is unknown, but chronic sunlight exposure and eye irritation may contribute to its development. Welding is a significant occupational risk. Symptoms A...
  3. Pinna abnormalities and low-set ears Pinna abnormalities and low-set ears
    Pinna abnormalities and low-set ears refer to abnormalities in the shape or position of the outer ear (pinna or auricle). Considerations During fetal development, the outer ear or "pinna" forms at a time when many other critical organs are developing (such as the kidneys). Abnormalities in the s...
  4. Pinworm test Pinworm test
    This test is used to detect the presence of pinworms. Pinworms are small, thin worms that commonly infect young children, although anyone can be infected. The adult pinworms live in the intestine and colon. At night, the female adult worms deposit their eggs outside the rectum or anal area. How the...
  5. Pinworms Pinworms
    Pinworms are small worms that infect the intestines. Causes Pinworms are the most common worm infection in the United States. They are most common in school-age children. Pinworm eggs are spread directly from person to person. They can also be spread by touching bedding, food, or other items contam...
  6. Piroxicam overdose Piroxicam overdose
    Piroxicam is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain and swelling. Piroxicam overdose occurs when someone takes too much of this drug. This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you sho...
  7. Pituitary infarction Pituitary infarction
    Pituitary infarction is the death of an area of tissue in the pituitary gland, a small gland joined to the hypothalamus (part of the brain). The pituitary produces many of the hormones that control essential body processes. Causes Pituitary infarction is most commonly caused by bleeding due to a no...
  8. Pituitary tumor Pituitary tumor
    A pituitary tumor is an abnormal growth in the pituitary gland, the part of the brain that regulates the body's balance of hormones. Causes Most pituitary tumors are noncancerous (benign). Up to 20% of people have pituitary tumors. However, many of these tumors do not cause symptoms and are never d...
  9. Pityriasis alba Pityriasis alba
    Pityriasis alba is a common skin disorder similar to very mild eczema. Causes The cause is unknown. The disorder is most common in children and adolescents -- particularly in children with dark skin. Symptoms Round or oval, colorless patches of skin appear on the face, upper arms, neck, and upper m...
  10. Pityriasis rosea Pityriasis rosea
    Pityriasis rosea is a common type of skin rash seen in young adults. Causes Pityriasis rosea is believed to be caused by a virus. It occurs most often in the fall and spring. Although pityriasis rosea may occur in more than one person in a household at a time, it is not thought to be highly contagi...
  11. Pityriasis rubra pilaris Pityriasis rubra pilaris
    Pityriasis rubra pilaris is a skin disorder that causes constant inflammation and scaling (exfoliation) of the skin. Causes There are many different types of pityriasis rubra pilaris. The cause is unknown, although genetic factors may play a role. Symptoms Pityriasis rubra pilaris is a chronic skin...
  12. Placenta abruptio Placenta abruptio
    Placenta abruptio is separation of the placenta (the organ that nourishes the fetus) from the site of uterine implantation before delivery of the fetus. Causes The exact cause of a placetal abruption may be difficult to determine. Direct causes are rare, but include: Abnormally short umbilical cor...
  13. Placenta previa Placenta previa
    Placenta previa is a complication of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix. The placenta is the organ that nourishes the developing baby in the womb. Causes During pregnancy, the placenta moves as the uterus...
  14. Placental insufficiency Placental insufficiency
    Placental insufficiency is a complication of pregnancy in which the placenta cannot bring enough oxygen and nutrients to a baby growing in the womb. The placenta is the organ that develops during pregnancy to feed a developing baby. See also: Intrauterine growth restriction Causes Certain medical ...
  15. Plague Plague
    Plague is a severe and potentially deadly bacterial infection. Causes Plague is caused by the organism Yersinia pestis. Rodents, such as rats, spread the disease to humans. People can get the plague when they are bitten by a flea that carries the plague bacteria from an infected rodent. In rare cas...