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Heart Attacks

A heart attack (also known as a myocardial infarction) is the death of heart muscle from the sudden blockage of a coronary artery by a blood clot. Coronary arteries are blood vessels that supply the heart muscle with blood and oxygen.   Blockage of a coronary artery deprives the heart muscle of blood and oxygen,causing injury to the ...

Heart Disease

The heart is like any other muscle, requiring blood to supply oxygen and nutrients for it to function.   The heart's needs are provided by the coronary arteries, which begin at the base of the aorta and spread across the surface of the heart, branching out to all areas of the heart muscle.   The coronary arteries are ...

Heat Stroke

Heat stroke is a form of hyperthermia in which the body temperature is elevated dramatically.   Heat stroke is a medical emergency and can be fatal if not promptly and properly treated.   Cooling the victim is a critical step in the treatment of heat stroke.   The most important measures to prevent heat strokes ...

Heel Pain

Heel pain is an extremely common complaint, and there are several common causes. It is important to make an accurate diagnosis of the cause of your symptoms so that appropriate treatment can be directed at the cause.   If you have heel pain, some causes include:   Plantar Fasciitis Plantar fasciitis is the most common ...

Hemorrhoids

A precise definition of hemorrhoids does not exist, but they can be described as masses or clumps ("cushions") of tissue within the anal canal that contain blood vessels and the surrounding, supporting tissue made up of muscle and elastic fibers.   The anal canal is the last four centimeters through which stool passes as it ...

Hepatitis

Hepatitis means inflammation of the liver. Many illnesses and conditions can cause inflammation of the liver, for example, drugs, alcohol, chemicals, and autoimmunediseases.   Many viruses, for example, the virus of mononucleosis and thecytomegalovirus can inflame the liver. Most viruses, however, do not primarily attack the liver; ...

Herniated Discs

The vertebrae are the bony building blocks of the spine. Between each of the largest parts (bodies) of the vertebrae are the discs. Ligaments are situated around the spine and discs.   The spine has seven vertebrae in the neck (cervical vertebrae), 12 vertebrae in the mid-back (thoracic vertebrae), and five vertebrae in the low back ...

Hiatal Hernia

A hiatal hernia is an anatomical abnormality in which part of the stomach protrudes through the diaphragm and up into the chest.   Although hiatal hernias are present in approximately 15% of the population, they are associated with symptoms in only a minority of those afflicted.   Normally, the esophagus or food tube ...

HIV AIDS

The history of the human immunodeficiency virus (HIV) andacquired immunodeficiency syndrome (AIDS) dates back to 1981, when homosexual men with symptoms of a disease that now are considered typical of AIDS were first described in Los Angeles and New York.   The men had an unusual type of lung infection (pneumonia) called Pneumocystis ...

Hives

Hives (medically known as urticaria) appear on the skin as wheals which are red, very itchy, smoothly elevated areas of skin often with a blanched center. They appear in varying shapes and sizes, from a few millimeters to several inches in diameter anywhere on the body.   It is estimated that 20% of all people will develop urticaria ...

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