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Medical Dictionary

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HDL
HDL is the acronym for high-density lipoprotein. HDL is a type of cholesterol found in the blood and is commonly referred to as the "good" cholesterol.
Heart Attack
A heart attack is when one of the arteries that supplies blood to the heart muscle (myocardium) becomes suddenly blocked and causes the death of the affected area of the heart muscle. Heart attack is a common term for myocardial infarction (MI).
Heart Disease
Heart disease refers to any number of conditions that affects the normal structure or function of the heart muscle, heart valves, or blood vessels of the heart.
Heart Failure
Heart failure is when the heart is not pumping blood like it should and fluid builds up in the body. Failure doesn't mean that the heart has stopped pumping but that it is not pumping as effectively as it should. Also called congestive heart failure (CHF).
High Blood Pressure
High blood pressure is when there is too much force exerted on the blood vessel walls as the heart pumps blood thru the body. High blood pressure is also called hypertension.
High-Density Lipoprotein
High-Density Lipoprotein (HDL) is a type of cholesterol found in the blood. It is commonly referred to as the "good" cholesterol because it transports cholesterol to the liver where it is broken down and then eliminated from the body. High HDL levels decrease the risk of heart disease.
Hormone
A hormone is a chemical messenger that travels in the bloodstream that controls various bodily functions.
Hydrogenation
Hydrogenation is a chemical process that changes liquid fat (oil) into a solid fat (trans fatty acids). Trans fatty acids are found in margarine, shortening, and some commercial baked foods like cookies, crackers, muffins, and cereals. Eating trans fatty acids may raise heart disease risk.
Hypertension
Hypertension is when there is too much force exerted on the blood vessel walls as the heart pumps blood thru the body. Hypertension is also called high blood pressure.
Hyperthermia
Hyperthermia is a serious medical condition in which the body's temperature reaches higher than normal levels, often due to prolonged exposure to heat or excessive physical activity. When body temperatures are above 104 degrees Fahrenheit or 40 degrees Celsius it is considered life-threatening.
Hypothermia
Hypothermia is a serious medical condition in which when the body's core temperature falls below normal. The body's normal core temperature is 98.6 degrees Fahrenheit or 37 degrees Celsius. When the core temperature starts to drop, usually due to prolonged exposure to cold and wet conditions, the body's metabolism is not able to function properly. Symptoms include uncontrollable shivering, loss of coordination, and confusion; all symptoms become more severe as the condition worsens and can lead to coma and death if not treated.
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