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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «A»:

  1. Anaphylaxis Anaphylaxis
    Anaphylaxis is a life-threatening type of allergic reaction. Causes Anaphylaxis is a severe, whole-body allergic reaction to a chemical that has become an allergen. After being exposed to a substance such as bee sting venom, the person's immune system becomes sensitized to it. On a later exposure t...
  2. Anaplastic thyroid cancer Anaplastic thyroid cancer
    Anaplastic thyroid carcinoma is a rare and aggressive form of cancer of the thyroid gland. Causes Anaplastic thyroid cancer grows very rapidly and is an invasive type of thyroid cancer. It occurs most often in people over age 60. The cause is unknown. Anaplastic cancer accounts for only about 1% of...
  3. Anastomosis Anastomosis
    An anastomosis is a surgical connection between two structures. It usually means a connection that is created between tubular structures, such as blood vessels or loops of intestine. For example, when part of an intestine is surgically removed, the two remaining ends are sewn or stapled together (an...
  4. Androgen insensitivity syndrome Androgen insensitivity syndrome
    Androgen insensitivity syndrome (AIS) is when a person who is genetically male (has one X and one Y chromosome) is resistant to male hormones called androgens. As a result, the person has some or all of the physical characteristics of a woman, despite having the genetic makeup of a man. Causes Andr...
  5. Anemia Anemia
    Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. See also: Anemia due to B12 deficiency Anemia due to folate deficiency Anemia due to iron deficiency Anemia of chronic disease Hemolytic anemia Idiopathic...
  6. Anemia - B12 deficiency Anemia - B12 deficiency
    Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. Vitamin B12 deficiency anemia is a low red blood cell count due to a lack of vitamin B12. See also: Megaloblastic anemia Pernicious anemia Causes Your body nee...
  7. Anemia of chronic disease Anemia of chronic disease
    Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. There are many types of anemia. Anemia of chronic disease is a blood disorder that results from a long-term (chronic) medical condition that affects the production an...
  8. Anencephaly Anencephaly
    Anencephaly is the absence of a large part of the brain and the skull. Causes Anencephaly is one of the most common neural tube defects. Neural tube defects are birth defects that affect the tissue that grows into the spinal cord and brain. Anencephaly occurs early in the development of an unborn b...
  9. Anesthesia Anesthesia
    Anesthesia is the delivery of medicine to prevent you from feeling pain during surgery and other medical or dental procedures. Information Anesthesia may be given to you by a special doctor called an anesthesiologist or other health care provider. There are three main forms of anesthesia: Local an...
  10. Anesthesia - what to ask your doctor - adult Anesthesia - what to ask your doctor - adult
    You are scheduled to have a surgery or procedure. You will need to talk with your doctor about the type of anesthesia that will be best for you. Below are some questions you may want to ask your doctor. Questions Which type of anesthesia is best for me and the procedure that I am having? General a...
  11. Anesthesia - what to ask your doctor - child Anesthesia - what to ask your doctor - child
    Your child is scheduled to have a surgery or procedure. You will need to talk with your child’s doctor about the type of anesthesia that will be best for your child. Below are some questions you may want to ask. Questions Which type of anesthesia is best for my child and the procedure that m...
  12. Aneurysm Aneurysm
    An aneurysm is an abnormal widening or ballooning of a portion of an artery due to weakness in the wall of the blood vessel. See also: Abdominal aortic aneurysm Cerebral aneurysm Thoracic aortic aneurysm Causes It is not clear exactly what causes aneurysms. Some aneurysms are present at bir...
  13. Aneurysm in the brain Aneurysm in the brain
    An aneurysm is an abnormal widening or ballooning of a section of a blood vessel. When an aneurysm occurs in the brain, it is called a cerebral aneurysm. Causes Aneurysms in the brain occur when there is a weakened area in the wall of a blood vessel. An aneurysm may be present from birth (congenit...
  14. Angina Angina
    Angina is a type of chest discomfort due to poor blood flow through the blood vessels (coronary vessels) of the heart muscle (myocardium). Related topics: Chest pain Stable angina Unstable angina Variant angina Symptoms Some patients (especially women, the elderly, and people with diabete...
  15. Angina - what to ask your doctor Angina - what to ask your doctor
    Angina is pain or pressure in the chest that happens when your heart muscle is not getting enough blood and oxygen. You sometimes feel it in your neck or jaw. Sometimes you may notice only that your breath is short. Below are some questions you may want to ask your doctor or nurse to help you take c...