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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «H»:

  1. Hyperkalemic periodic paralysis Hyperkalemic periodic paralysis
    Hyperkalemic periodic paralysis is a disorder that involves occasional episodes of muscle weakness and, sometimes, higher than normal levels of potassium in the blood. It is one of a group of genetic disorders that includes hypokalemic periodic paralysis and thyrotoxic periodic paralysis. Causes Hy...
  2. Hypermobile joints Hypermobile joints
    Hypermobile joints are joints that move beyond the normal range with little effort. Joints most commonly affected are the elbows, wrists, fingers, and knees. Considerations Children generally tend to be more flexible than adults, but those with hypermobile joints can flexing and extend their joints...
  3. Hyperparathyroidism Hyperparathyroidism
    Hyperparathyroidism is excessive production of parathyroid hormone (PTH) by the parathyroid glands. See also: Primary hyperparathyroidism Secondary hyperparathyroidism Causes The parathyroid glands are located in the neck, near or attached to the back side of the thyroid gland. They produce p...
  4. Hyperplasia Hyperplasia
    Hyperplasia is increased cell production in a normal tissue or organ. Hyperplasia may be a sign of precancerous changes. This is called pathologic hyperplasia. It can also be due to the growth of completely normal cells. This is called physiologic hyperplasia. Alternative Names Hypergenesis...
  5. Hypersensitivity pneumonitis Hypersensitivity pneumonitis
    Hypersensitivity pneumonitis is inflammation of the lungs due to breathing in a foreign substance, usually certain types of dust, fungus, or molds. Causes Hypersensitivity pneumonitis usually occurs in those who work in places where there are high levels of organic dusts, fungus, or molds. For exam...
  6. Hypersplenism Hypersplenism
    Hypersplenism is a condition in which the spleen is overactive. Causes Hypersplenism can be caused by: Cirrhosis Lymphoma Malaria Tuberculosis Various connective tissue and inflammatory diseases Symptoms Symptoms include: Enlarged spleen Low level of one or more types of blood cells Pre...
  7. Hypertension Hypertension
    Hypertension is the term used to describe high blood pressure. Blood pressure is a measurement of the force against the walls of your arteries as the heart pumps blood through the body. Blood pressure readings are measured in millimeters of mercury (mmHg) and usually given as two numbers -- for exam...
  8. Hypertensive heart disease Hypertensive heart disease
    Hypertensive heart disease refers to heart problems that occur because of high blood pressure. These problems include: Coronary artery disease Heart failure Thickening of the heart muscle See also: Hypertension Malignant hypertension Causes High blood pressure increases the pressure in...
  9. Hypertensive retinopathy Hypertensive retinopathy
    Hypertensive retinopathy is damage to the back part of the eye (retina) caused by high blood pressure. Causes High blood pressure can cause damage to blood vessels in the eyes. The higher the blood pressure and the longer it has been high, the more severe the damage is likely to be. Your health car...
  10. Hyperthyroidism Hyperthyroidism
    Hyperthyroidism is a condition in which the thyroid gland makes too much thyroid hormone. The condition is often referred to as an "overactive thyroid." Causes The thyroid gland is an important organ of the endocrine system. It is located in the front of the neck just below the voice box. The gland...
  11. Hypertrophic cardiomyopathy Hypertrophic cardiomyopathy
    Hypertrophic cardiomyopathy (HCM) is a condition in which the heart muscle becomes thick. The thickening makes it harder for blood to leave the heart, forcing the heart to work harder to pump blood. Causes Hypertrophic cardiomyopathy is often asymmetrical, meaning one part of the heart is thicker t...
  12. Hyperventilation Hyperventilation
    Hyperventilation is rapid or deep breathing that can occur with anxiety or panic. It is also called overbreathing, and may leave you feeling breathless. See also: Rapid shallow breathing Considerations When you breathe, you inhale oxygen and exhale carbon dioxide. Excessive breathing leads to low ...
  13. Hyperviscosity - newborn Hyperviscosity - newborn
    Hyperviscosity of the newborn is the slowing and blockage of blood flow that results when there are too many red blood cells in an infant's blood. Causes Hyperviscosity can occur when the percentage of red blood cells (RBCs) in the infant's blood is greater than 65%. This may result from various co...
  14. Hypervitaminosis A Hypervitaminosis A
    Hypervitaminosis A is having too much vitamin A in the body. Causes There are two types of vitamin A hypervitaminosis: Acute -- caused by taking too much vitamin A over a short period of time Chronic -- occurs when too much of the vitamin is present over a longer period Chronic vitamin A toxicit...
  15. Hypervitaminosis D Hypervitaminosis D
    Hypervitaminosis D is a condition that occurs after taking excessive doses of vitamin D. Causes An excess of vitamin D causes abnormally high levels of calcium in the blood, which can eventually severely damage the bones, soft tissues, and kidneys. It is almost always caused by forms of vitamin D t...