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Drugs and diseases reference index

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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «H»:

  1. Hypertrophy, benign prostatic Hypertrophy, benign prostatic
    Hypertrophy, benign prostatic: See: Benign prostatic hyperplasia....
  2. Hyperuricemia Hyperuricemia
    Hyperuricemia: Abnormally elevated blood level of uric acid. Uric acid is a breakdown product of purines that are part of many foods we eat. While hyperuricemia may indicate an increased risk of gout , the relationship between hyperuricemia and gout is unclear. Many...
  3. Hyperventilation Hyperventilation
    Hyperventilation: Overbreathing. This can cause dizziness, lightheadedness, weakness, shortness of breath, a sense of unsteadiness, muscle spasms in the hands and feet, and tingling around the mouth and fingertips. All of these symptoms are the result of abnormally low levels of carbon dioxide in t...
  4. Hypervolemia Hypervolemia
    Hypervolemia: An abnormal increase in blood volume or, strictly speaking, an abnormal increase in the volume of blood plasma. From hyper- + volume + emia (blood)....
  5. Hypervolemic Hypervolemic
    Hypervolemic: Pertaining to hypervolemia, an abnormal increase in blood volume. For example, hypervolemic hyponatremia refers to the lowering of the blood sodium level due to hypervolemia, expansion of the blood volume....
  6. Hypnagogic Hypnagogic
    Hypnagogic: Concerning the drowsiness one commonly feels before sleep, the transitional state preceding sleep, and also the hallucinations that may occur at that time. The original French word "hypnagogique" was derived from Greek roots "hypno-", sleep + "agogos", leading = leading to sleep. In the...
  7. Hypnagogic hallucination Hypnagogic hallucination
    Hypnagogic hallucination: A vivid dreamlike hallucination that occurs as one is falling asleep. The opposite of an hypnopompic hallucination which is a vivid dreamlike hallucination that occurs as one is waking up....
  8. Hypnic Hypnic
    Hypnic: 1. Inducing sleep. 2. Pertaining to sleep. A hypnic jerk is a sleep start or jerk. From the Greek hypnikos, from the Greek hypnos, sleep....
  9. Hypnic headache Hypnic headache
    Hypnic headache: A relatively rare form of headache disorder in which the patient is awakened from sleep nightly, usually between 1 and 3am, with intense dull or throbbing pain over the whole head. Each episode may last up to 1 hour and be associated with nausea. Similar episodes may occasionally st...
  10. Hypnic jerk Hypnic jerk
    Hypnic jerk: The common normal phenomenon of jerking awake, usually accompanied by a feeling of falling, just as one is drifting off to sleep. Also called a sleep jerk or sleep start....
  11. Hypnolepsy Hypnolepsy
    Hypnolepsy: A neurological disorder marked by a sudden recurrent uncontrollable compulsion to sleep. Also known as narcolepsy. The disorder is often associated with cataplexy (a sudden loss of muscle tone and paralysis of voluntary muscles associated with a strong emotion), sleep paralysis (immobi...
  12. Hypnopompic hallucination Hypnopompic hallucination
    Hypnopompic hallucination: A vivid dreamlike hallucination that occurs as one is waking up. The opposite of an hypnagogic hallucination, which occurs as one is falling asleep....
  13. Hypnos Hypnos
    Hypnos: The Greek and Roman god of sleep. From his name is derived the term hypnosis. Hypnos was the twin of Thanatos, the personification of death. Both Hypnos and Thanatos lived in the underworld....
  14. Hypnosis Hypnosis
    Hypnosis: A part of healing from ancient times. The induction of trance states and the use of therapeutic suggestion were a central feature of the early Greek healing temples, and variations of these techniques were practiced throughout the ancient world. Modern hypnosis began in the eighteenth...
  15. Hypo- Hypo-
    Hypo-: Prefix meaning "low, under, beneath, down, below normal" as in hypocalcemia (low calcium in the blood), hypoglycemia (low blood sugar) and hyposensitivity. The opposite of hypo- is hyper-. See also: Sub-....