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High Cholesterol
Cholesterol is a waxy, fat-like substance your body needs to build cells and make certain hormones. High cholesterol, also called hyperlipidemia, means…
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Hirschsprung Disease
Hirschsprung disease is a condition present at birth in which nerve cells are missing from a segment of the colon, or large…
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Hives
Hives are a temporary skin reaction that causes raised, itchy welts, also called urticaria. Individual welts can change shape, fade, and reappear…
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Hydrocephalus
Hydrocephalus is an abnormal buildup of cerebrospinal fluid in or around the brain. This extra fluid can enlarge the brain’s ventricles and…
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Hypercholesterolaemia
Hypercholesterolaemia means having higher-than-healthy levels of cholesterol in the blood. It often causes no noticeable symptoms, so many people discover it during…
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Hyperdontia
Hyperdontia is a dental condition in which one or more extra teeth develop in addition to the normal set. These extra teeth…
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Hyperlipidemia
Hyperlipidemia is a condition in which fats in the blood are higher than is healthy. These fats include cholesterol and triglycerides, which…
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Hypernatraemia
Hypernatraemia is an abnormally high level of sodium in the blood. It usually happens when the body has too little water compared…
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Hyperopia
Hyperopia, also called farsightedness or hypermetropia, is a refractive error in which light focuses behind the retina instead of directly on it.…
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Hyperparathyroidism
Hyperparathyroidism occurs when one or more of the four parathyroid glands make too much parathyroid hormone. This hormone helps control calcium levels,…
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Hypertension
Hypertension, also called high blood pressure, means that pressure remains higher than healthy levels inside the arteries. It can affect adults of…
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Hypertensive Crisis
A hypertensive crisis is a dangerously high rise in blood pressure that needs prompt medical attention. Very high blood pressure can damage…
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Hypertensive Nephrosclerosis
Hypertensive nephrosclerosis is kidney damage caused by long-term, poorly controlled high blood pressure. Persistent pressure can narrow and stiffen the small arteries…
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Hyperthyroidism
Hyperthyroidism occurs when the thyroid gland makes too much thyroid hormone, causing many body processes to speed up. It can lead to…
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Hypertrophic Scar
A hypertrophic scar is raised, thickened scar tissue caused by an overactive healing response after the skin is injured. It forms when…
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Hypertrophy Of Nasal Turbinates
Hypertrophy of nasal turbinates means that one or more turbinates inside the nose have become enlarged or swollen. The turbinates are structures…
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Hypertropia
Hypertropia is a type of eye misalignment in which one eye appears higher than the other. The eyes may not work together…
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Hypervitaminosis A
Hypervitaminosis A is a condition caused by having too much vitamin A in the body. It can happen suddenly after a very…
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Hypodontia
Hypodontia is a developmental condition in which one or more permanent teeth do not form. The missing teeth are present from birth…
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Hypokalemia
Hypokalemia is the medical term for a potassium level in the blood that is lower than the body needs. Potassium helps muscle…
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Hyponatremia
Hyponatremia is a lower-than-normal concentration of sodium in the blood. Sodium helps control the balance of water in and around cells and…
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Hypopituitarism
Hypopituitarism occurs when the pituitary gland produces too little of one or more important hormones. The pituitary is a small gland at…
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Hypospadias
Hypospadias is a congenital difference in which the opening of the urethra is not at the usual tip of the penis. It…
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Hypothyroidism
Hypothyroidism is an underactive thyroid that does not produce enough thyroid hormone. This hormone helps regulate metabolism, which affects how the body…
