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Medical Dictionary Starting with H

H1 (Histamine) Blocker

A drug that blocks the action of histamine; used to treat inflammation

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H2 (Histamine) Blocker

A drug used in the treatment of peptic ulcers that blocks histamine from causing acid production in the stomach

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Haemophilus Influenzae

Also Called H Influenzae Represents a group of bacteria that may cause different types of infections in infants and children H influenzae most commonly causes ear, eye, or sinus infections, and pneumo...

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Hair Follicle

A tiny opening in the skin from which a hair grows

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Half Life

The time required for half of the original amount of a drug to be eliminated from the body, or for a drug to decrease to half its original concentration in the blood

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Halitosis

The clinical term for bad breath; commonly caused by poor oral hygiene or eating certain foods; if persistent it can be a sign of illness

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Hallucination

Illusory perception; a common symptom of severe mental disorder; Delusion

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Hamartoma

A focal growth that resembles a neoplasm but results from faulty development in an organ

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Hammer Toe

An abnormality in the tendons of the toe that causes the toe to be flexed at all times

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Hamstring Muscle

A muscle located at the back of the thigh that bends the leg at the knee and moves the leg backward

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Hand, Foot & Mouth Disease

Hand, foot and mouth disease is a viral infection caused by a strain of Coxsackie virus It causes a blister-like rash that, as the name implies, involves the hands, feet and mouth. Symptoms of fever, ...

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Hard Measles

Rubeola; Rubeola; The measle, a disease attended with inflammatory fever, dry cough, sneezing, drowsiness, and an eruption of small red points, perceptible by the touch

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Hard Metal Disease

Cobalt Lung or Tungsten Carbide Disease; A pneumoconiosis caused by inhalation of fine particles of cobalt, usually in conjunction with tungsten carbide In early stages reversible hyperplasia and meta...

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Hardening Of Arteries

The condition of arteriosclerosis

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Hardening Of Bowels

Induration; The hardening of a normally soft tissue or organ, especially the skin, because of inflammation, infiltration of a neoplasm, or an accumulation of blood

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Harvester's Lung

Farmer'S Lung; A type of hypersensitivity pneumonitis caused by inhalation of moldy hay dust, characterized by breathlessness with cyanosis or with a dry cough, anorexia, and weight loss It is most of...

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Hashimoto's Disease

A disease in which the body's immune system attacks cells of the thyroid gland, resulting in a decrease in thyroid hormones

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Hatter's Shakes

Mercurial tremor; Workers in mercury, such as water-gilders, looking-glass makers, and the makers of barometers and thermometers, are apt to suffer from a peculiar form of shaking palsy, known as the ...

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Hay Fever

Hay Asthma; An allergic condition affecting the mucous membranes of the upper respiratory tract and the eyes, most often characterized by nasal discharge, sneezing, and itchy, watery eyes and usually ...

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Head Cold

A common cold mainly affecting the mucous membranes of the nasal passages, characterized by congestion, headache, and sneezing

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Headache

Pain or discomfort in the head or face area Headaches can be single or recurrent in nature, and localized to one or more areas of the head and face also called cephalalgia

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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. If blood flow is not restored within 20 to 40 minutes, irreversible de...

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Heart Block

A disorder of the heart caused by a blockage of the nerve impulses to the heart that regulate heartbeat; may lead to dizziness, fainting, or stroke

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Heart Burn

An esophageal symptom consisting of a retrosternal sensation of warmth or burning occurring in waves and tending to rise upward toward the neck; it may be accompanied by a reflux of fluid into the mou...

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Heart Disease

A structural or functional abnormality of the heart, or of the blood vessels supplying the heart, that impairs its normal functioning

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Heart Failure

The inability of the heart to pump blood effectively

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Heart Rate

The rate at which the heart pumps blood, measured in the number of heartbeats per minute

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Heart Sickness

Condition caused by loss of salt from body Extreme depression of spirits

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Heart Valve

The structure at each exit of the four chambers of the heart that allows blood to exit but not to flow back in

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Heart-Lung Machine

A machine that takes over the functions of the heart and lungs during certain types of surgery

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Heartwater

A serious febrile disease of sheep, goats, and cattle that is caused by Cowdria (C ruminantium) transmitted by a bont tick (Amblyomma hebraeum) called also heartwater disease, heartwater fever

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Heat Cramps

Caused by sweating heavily and inadequate electrolytes intake Usually manifested by spasms in arms, legs, and abdomen

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Heat Exhaustion

Characterized by weakness, vertigo, headache, nausea, and peripheral vascular collapse

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