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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «O»:

  1. Osteomyelitis - discharge Osteomyelitis - discharge
    You have osteomyelitis, a bone infection caused by germs (bacteria). You may have been in the hospital to treat a broken bone or to have some other surgery on your bones. Your surgeon may also have removed some infection from your bones or drained an abscess. What to Expect at Home Your doctor will...
  2. Osteonecrosis Osteonecrosis
    Osteonecrosis is bone death caused by poor blood supply to the area. It is most common in the hip and shoulder. Causes Osteonecrosis occurs when part of the bone does not get blood and dies. After a while the bone can break off. If this condition is not treated, bone damage gets worse. Eventually, ...
  3. Osteopenia - premature infants Osteopenia - premature infants
    Osteopenia is a decrease in the amount of calcium and phosphorus in the bone. This can cause bones to be weak and brittle, and increases the risk for broken bones. Causes During the last 3 months of pregnancy, large amounts of calcium and phosphorus are transferred from the mother to the baby so th...
  4. Osteoporosis Osteoporosis
    Osteoporosis is the thinning of bone tissue and loss of bone density over time. Causes Osteoporosis is the most common type of bone disease. Researchers estimate that about 1 out of 5 American women over the age of 50 have osteoporosis. About half of all women over the age of 50 will have a fractur...
  5. Osteosarcoma Osteosarcoma
    Osteosarcoma is a cancerous (malignant) bone tumor that usually develops during the period of rapid growth that occurs in adolescence, as a teenager matures into an adult. Causes Osteosarcoma is the most common cancerous (malignant) bone tumor in youth. The average age at diagnosis is 15. Boys and ...
  6. Ostomy - resources Ostomy - resources
    The following organizations are good resources for information on ostomies: American Society of Colon and Rectal Surgeons - www.fascrs.org United Ostomy Associations of America, Inc. - www.uoaa.org Alternative Names Resources - ostomy...
  7. Otitis media with effusion Otitis media with effusion
    Otitis media with effusion (OME) is when there is thick or sticky fluid behind the eardrum in the middle ear, but there is no ear infection. Causes The Eustachian tube connects the inside of the ear to the back of the throat. This tube helps drain fluids to prevent them from building up in the ear....
  8. Otosclerosis Otosclerosis
    Otosclerosis is an abnormal bone growth in the middle ear that causes hearing loss. Causes The cause of otosclerosis is unknown. However, there is some evidence that it may be passed down through families. People who have otosclerosis have an abnormal sponge-like bone growing in the middle ear. Thi...
  9. Ovarian cancer Ovarian cancer
    Ovarian cancer is cancer that starts in the ovaries. The ovaries are the female reproductive organs that produce eggs. Causes Ovarian cancer is the fifth most common cancer among women, and it causes more deaths than any other type of female reproductive cancer. The cause is unknown. The risk for d...
  10. Ovarian cysts Ovarian cysts
    An ovarian cyst is a sac filled with fluid that forms on or inside of an ovary. This article is about cysts that form during your monthly menstrual cycle, called functional cysts. Functional cysts are not the same as cysts caused by cancer or other diseases. For more information about other causes o...
  11. Ovarian hyperstimulation syndrome Ovarian hyperstimulation syndrome
    Ovarian hyperstimulation syndrome (OHSS) is a complication occasionally seen in women who take certain fertility medicines that stimulate egg production. See also: Infertility Causes Normally, a woman produces one egg per month. Some women undergoing fertility treatments are given medicines to hel...
  12. Ovarian hypofunction Ovarian hypofunction
    Ovarian hypofunction is reduced function of the ovaries (including decreased production of hormones). Causes Ovarian hypofunction may be caused by genetic factors such as chromosome abnormalities, or it may occur with certain autoimmune disorders that disrupt normal ovarian function. Chemotherap...
  13. Ovarian overproduction of androgens Ovarian overproduction of androgens
    Ovarian overproduction of androgens is a condition in which the female ovaries make too much testosterone. This leads to the development of male characteristics in a woman. Other hormones, called androgens, from other parts of the body can also cause the development of male characteristics in women....
  14. Oven cleaner poisoning Oven cleaner poisoning
    This article discusses the harmful effects from swallowing or breathing in an oven cleaner. 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 should call your local emergency number (such as 911) or the National Poi...
  15. Over-the-counter birth control Over-the-counter birth control
    Over-the-counter birth control methods are used during sex to avoid pregnancy and sometimes to prevent sexually transmitted infections (STIs). Over-the-counter means that they can be purchased by anyone, without a doctor's prescription. For more information about birth control options, see: Birth ...