Acute bacterial rhinosinusitis (ABRS) is an infection of both your nasal cavity and sinuses. It is caused by bacteria. Here's what you need to know about this condition.

Bronchitis is an inflammation of the large breathing tubes (bronchi) in the lungs. Short-term (acute) bronchitis means that the symptoms often develop quickly and don't last long.

AFLP is a rare, but serious, liver problem in pregnancy. With AFLP the liver cells have too much fat, which can damage the liver.

Acute liver failure is when your liver suddenly starts to not work. This often happens right after an overdose of medicine or poisoning.

Leukemia is cancer that starts in the bone marrow. When a person has leukemia, the body makes too many abnormal blood cells. Learn more about symptoms, diagnosis, and treatments.

Pancreatitis is inflammation of the pancreas. It can be caused by gallstones, alcohol consumption, and certain medicines, among other causes.

Asthma can be unpredictable. But it's important to recognize the difference between a minor flare-up and an attack that could be life-threatening. Read on to learn more.

Car accidents, falls, and other injuries are a common cause of acute spinal cord injury.

Acute spinal cord injury (SCI) is when the spinal cord is damaged from an accident or other situation. An SCI may be a bruise (contusion), a partial tear, or a complete tear (transection) in the spinal cord.

A traumatic injury to the spine can cause a bruise, a partial tear, or a complete tear in the spinal cord. Read on for details about causes, symptoms, treatment, prevention, and management.

Addison disease is when the adrenal glands don't make enough of two steroid hormones. The hormones are cortisol and aldosterone. Cortisol controls the body's metabolism, blocks inflammatory reactions, and affects the immune system. ...

Adenoviruses are a group of viruses that cause a variety of infections. These include the common cold, conjunctivitis, and croup.

An adjustment disorder is an unhealthy emotional or behavioral reaction to a stressful event or change in a person's life. The response happens within 3 months of the stressful event.

Scoliosis is a side-to-side curve in the back. Adolescent idiopathic scoliosis (AIS) occurs at age 10 or later. It may start at puberty or during a growth spurt in the teens.

Adrenal tumors occur when cells in the adrenal gland cause an oversupply of certain powerful hormones. This can cause a variety of conditions, from high blood pressure to panic attacks. Only about five percent of tumors that grow inside ...

Adrenal cancer is a rare cancer that starts in the adrenal glands. You have 2 adrenal glands. One sits on top of each kidney. Learn more about symptoms, diagnosis, and treatments.

Adrenal insufficiency is a disorder that occurs when the adrenal glands don't make enough of the hormone cortisol. This hormone controls blood pressure and affects how your immune system works.

Even after we stop growing, adults still need growth hormone. Growth hormone is a protein made by the pituitary gland and released into the blood. Growth hormone plays a role in healthy muscle, how our bodies collect fat (especially ...

Afferent loop syndrome is a complication of certain types of stomach surgery.

African sleeping sickness (African trypanosomiasis) is a disease caused by a parasite. It is passed on by the bite of the infected tsetse fly.

Age-related hearing loss (presbycusis) is the slow loss of hearing in both ears. It’s a common problem linked to aging.

Age-related macular degeneration (AMD) is a disease that affects a person’s central vision. It's the most common cause of severe eyesight loss among people age 50 and older.

The spine is made up of bones and discs. The discs are like gelatin. As we get older, the discs start to dry out and no longer cushion the bones. Without the cushioning of the discs, the nerve roots or spinal cord (or both) start to get ...

A person who has been infected by the human immunodeficiency virus (HIV) is diagnosed as having AIDS after developing one of the illnesses that the Centers for Disease Control has identified as an indicator of AIDS. An HIV-positive ...

People who have AIDS are much more likely to get certain types of cancer than people without the disease.

AIDS-related lymphoma is a type of cancer called non-Hodgkin lymphoma. It grows in some people with AIDS. AIDS is a disease that weakens the immune system. AIDS raises the risk for long-term (chronic) disease, such as cancer.

AL Amyloidosis is caused by the accumulation of an immunoglobulin light chain protein. Typically, the protein is caused by a malignant or pre-malignant growth of identical, (clonal) lymphocytes or plasma cells that continue to produce ...

Alagille syndrome is an inherited condition in which bile builds up in the liver because there are too few bile ducts to drain the bile. This results in liver damage.

Alcohol septal ablation is a minimally invasive procedure for hypertrophic cardiomyopathy, a condition in which your heart muscle is abnormally thick. The purpose of the procedure is to decrease your symptoms and to reduce future ...

Alcohol-induced liver disease is caused by heavy use of alcohol. The liver's job is to break down alcohol. If you drink more than it can process, it can become badly damaged.