Diseases & conditions A-Z List
Diseases & Conditions A-Z List - «A»:
Attention deficit hyperactivity disorder (ADHD)
ADHD is a problem with inattentiveness, over-activity, impulsivity, or a combination. For these problems to be diagnosed as ADHD, they must be out of the normal range for a child's age and development.
Imaging studies suggest that the brains of children with ADHD are different from those of ...
Atypical pneumonia refers to pneumonia caused by certain bacteria, including Legionella pneumophila, Mycoplasma pneumoniae, and Chlamydophila pneumoniae.
This article provides a general overview of atypical pneumonia.
Legionella pneumonia (Legionnaire's disease)
An aural polyp is a growth in the outside (external) ear canal. It may be attached to the eardrum (tympanic membrane), or it may grow from the middle ear space.
Aural polyps may be caused by:
Bloody drainage from the ear is the m...
Auscultation is the method of listening to the sounds of the body during a physical examination.
Auscultation is usually done using a tool called a stethoscope. Health care providers routinely listen to a patient's lungs, heart, and intestines to evaluate the frequency, intensity, durat...
Autism is a developmental disorder that appears in the first 3 years of life, and affects the brain's normal development of social and communication skills.
Autism is a physical condition linked to abnormal biology and chemistry in the brain. The exact causes of these abnormalities remain un...
Autoerythrocyte sensitivity means your body is sensitive to its own red blood cells (erythrocytes). This generally results in the destruction of red blood cells.
An autoimmune disorder is a condition that occurs when the immune system mistakenly attacks and destroys healthy body tissue. There are more than 80 different types of autoimmune disorders.
See also: Immune response
Normally the immune system's army of white blood cells helps protect the bo...
Autoimmune hepatitis is inflammation of the liver that occurs when immune cells mistake the liver's normal cells for harmful invaders and attack them.
This disease is associated with other autoimmune diseases, including:
Autoimmune liver disease panel
An autoimmune liver disease panel is a series of tests performed when autoimmune liver disease is suspected. An autoimmune liver disease means that the body's immune system attacks the liver.
These tests include:
Anti-liver/kidney microsomal antibodies
Autoinoculation is a procedure in which cells are removed from a person's body, treated or medically changed, and then placed back into the body. The procedure is done to help prevent an immune reaction or to help diagnose a medical condition or illness.
Autoinoculation can also refer to the movemen...
Autonomic hyperreflexia is a reaction of the autonomic (involuntary) nervous system to overstimulation. This reaction may include high blood pressure, change in heart rate, skin color changes (paleness, redness, blue-grey skin color), and excessive sweating.
The most common cause of autonomi...
Autonomic neuropathy is a group of symptoms that occur when there is damage to the nerves that regulate blood pressure, heart rate, bowel and bladder emptying, digestion, and other body functions.
Autonomic neuropathy is a form of peripheral neuropathy. It is a group of symptoms, not a speci...
Autosomal dominant is one of several ways that a trait or disorder can be passed down through families.
If a disease is autosomal dominant, it means you only need to get the abnormal gene from one parent in order for you to inherit the disease. One of the parents may often have the disease.
Autosomal recessive is one of several ways that a trait, disorder, or disease can be passed down through families.
An autosomal recessive disorder means two copies of an abnormal gene must be present in order for the disease or trait to develop.
Inheriting a specific disease, condition,...
Avian influenza is flu infection in birds. The disease is of concern to humans, who have no immunity against it. The virus that causes this infection in birds can change (mutate) to infect humans. Such mutation could start a deadly worldwide epidemic.
The first avian influenza virus to infec...