Hairy cell leukemia
A rare type of chronic leukemia in which the abnormal white blood cells appear to be covered with tiny hairs when examined microscopically. The hairy cells are malignant B lymphocytes. There may be too few normal blood cells of all types because of an exc
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- Halitosis
An unpleasant odor from the mouth, commonly referred to as bad breath. Halitosis can be caused by the consumption of certain foods, poor oral hygiene, alcohol or tobacco use, dry mouth, or by certain chronic medical conditions.
- Hallervorden-Spatz disease
A genetic disorder in which there is progressive neurologic degeneration with the accumulation of iron in the brain. The gene for the disease is on chromosome 20 in region 20p13-p12.3. The syndrome was first described by Julius Hallervorden and Hugo Spatz in 1922 in 5 sisters who showed increasing dysarthria (trouble speaking) and progressive dementia […]
- Hallucination
An auditory hallucination is an hallucination involving the sense of hearing. Called also paracusia and paracusis. A gustatory hallucination is an hallucination involving the sense of taste. A hypnagogic hallucination is a vivid dreamlike hallucination at the onset of sleep. Hypnopompic hallucination is a vivid dreamlike hallucination on awakening. Kinesthetic hallucination is an hallucination involving […]
- Hallucinogen
A drug that causes hallucinations (profound distortions in a person’s perceptions of reality). Under the influence of hallucinogens, people see images, hear sounds, and feel sensations that seem real but do not exist. Some hallucinogens also produce rapid, intense emotional swings. Hallucinogens cause their effects by disrupting the interaction of nerve cells and the neurotransmitter […]
- Hallucinogenic
A drug that induces hallucinations. (This is incorrect usage; the noun is hallucinogen.)