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H2-Blockers
Medicines that block histamine2 reducing the amount of acid the stomach produces. Histamine causes the stomach to make acid. 
Heartburn  
A painful, burning feeling in the chest. Heartburn is caused by stomach acid flowing back into the esophagus. 
Helicobacter pylori (H. pylori)  
damages stomach and duodenal tissue, causing ulcers.
Hemoglobin A1C (HbA1C)  Increased levels are seen in poorly controlled diabetics.  As glucose attached to red cells for 120 days, a test to measure hemoglobin A1C shows what the person's average blood glucose level was for that period of time.
Hemochromatosis  
Body absorbs too much iron. 
Hemorrhoidectomy
An operation to remove hemorrhoids.
Hemorrhoids  
Engorged blood vessels in and around the anus and lower rectum occurs usually with constipation. 
Hemorrhagic
relating to bleeding
Hepatic Encephalopathy  
A condition that may cause loss of consciousness and coma. It is usually the result of advanced liver disease. Also called hepatic coma.
Hepatitis  
Irritation of the liver that sometimes causes permanent damage. Hepatitis may be caused by viruses , medicines or alcohol. 
Hepatotoxicity  
Damage to liver
Hernia
The part of an internal organ that pushes through an opening in the organ's wall. 
Herniorrhaphy  
An operation to repair a hernia.
Hiatal Hernia (Hiatus Hernia)
A small opening in the diaphragm that allows the upper part of the stomach to move up into the chest. 
High Blood Pressure
When the blood flows through the vessels at a greater than normal force.  Also called hypertension.
Hirschsprung's Disease  
A birth defect in which some nerve cells are lacking in the large intestine. The intestine cannot move stool through, so the intestine gets blocked. Causes the abdomen to swell.
Homeostatis
When the body is working as it should because all of its systems are in balance.
Host
a plant or animal harboring another organism.
Hyperbilirubinemia  
Excess bilirubin in the blood resulting in jaundice. 
Hyperglycemia
Too high a level of glucose (sugar) in the blood.
Hyperkeratosis
a disease resulting in the abnormal growth of the corneous layer of the skin
Hyperlipidemia
Incrased level of fats (lipids) in the blood.
Hyperpigmentation
abnormally increased pigmentation
Hyperplasia
an abnormal increase in the number of normal cells in a tissue
Hypertension
Blood pressure that is above the normal range. See also: High blood pressure.
Hypoglycemia
Decreased level of glucose (sugar) in the blood. 
Hypogonadism
Decreased gonad (sex gland) function.
Hypotension
Low blood pressure or a sudden drop in blood pressure. 
Hypothalamus
an area of the forebrain which regulates pituitary gland and other functions.
Hypoxemia
Decreased oxygen content in arterial blood