Definition of Hair Dyes
Consumers considering changing their hair color have a choice of coloring agents to use. What distinguishes them is how long they last and how they color hair. There are at least four basic categories of products: To apply permanent dyes, the ... [... more]
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Definition of Hair Loss
Each hair grows in cycles-it grows, rests, and then falls out. Usually, this cycle repeats approximately yearly. At any time, about ninety percent of a person's scalp hair is growing, a phase that lasts between two and six years. Ten percent of ... [... more]
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Hairy Cell Leukemia
Hairy cell leukemia is a disease in which cancer (malignant) cells are found in the blood and bone marrow. The disease is called hairy cell leukemia because the cancer cells look "hairy" when examined under a microscope. Hairy cell leukemia ... [... more]
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Definition of Halitosis
Halitosis is a common problem that can be a source of embarrassment. Halitosis may be related to a variety of causes, including bacterial infections and medications. Some bacteria in your mouth may produce gaseous compounds that cause bad breath. ... [... more]
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Hammertoes
A hammertoe is marked by a contracture of the tendons, laxity of the ligaments, and angulation of the second and third phalanges of the toe. Hammertoes, one of the most painful foot ailments, can be traced directly to the wearing of narrow, ... [... more]
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Hantavirus Infection
Hantavirus is a virus that is transmitted by rodents and causes infection in humans. The mini-epidemic of hantavirus infection that erupted in the Southwest in 1993 was an ominous new variation of an old theme. In other parts of the world, ... [... more]
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Hashimoto's Disease
Hashimoto's disease is an autoimmune thyroid disorder, characterized by the production of antibodies in response to thyroid antigens (antibody producing) and the replacement of normal thyroid structures with lymphocytes and lymphoid germinal centers. [... more]
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Definition of Head Lice
Head lice are parasites (about the size of a small ant) that often develop in the hair of children and sometimes adults. The head louse, Pediculus capitis humanus, is by no means a new nuisance. The insect has been an unwelcome companion to ... [... more]
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Description of Headache
Except perhaps for head colds, headaches are probably the most common human ailment. Three out of four Americans had a headache during the past year, according to the National Headache Foundation. Usually, headaches are merely passing annoyances ... [... more]
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Headache And Food
In many patients, eating certain foods may cause headaches. For these patients, a change in eating habits is an effective treatment for headaches. The diet-related causes of headaches are numerous and include the following: Headache is one of the ... [... more]
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Hearing Loss
Hearing impairment is a disability affecting about 1 in 10 North Americans. Hearing impairment results from a structural abnormality (such as a hole in the eardrum) that may or may not produce a functional disability (such as diminished ... [... more]
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Heart Arrhythmia
The heart has an intricate electrical system that synchronizes its beating. Controlled by its own pacemaker (the sinoatrial, or sinus node) and a complex conduction system, the heart beats an average of 70 to 80 times a minute over 100,000 times ... [... more]
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