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A decibel (dB) is a unit used to measure how loud a sound is (intensity). For example, a whisper usually measures about 15 dB to

Depression is an illness that makes you feel sad, lose interest in things you used to enjoy, withdraw from others, and have little

Dementia is a loss of mental skills—such as memory, problem solving, and learning—that's bad enough to interfere with your daily

Delusions are firmly held but false beliefs. The most common delusion people have is that someone is trying to steal from them.

Delirium (acute confusional state) is a sudden change in a person's mental status, leading to confusion and unusual behavior

Severe dehydration means: Your mouth and eyes may be extremely dry. You may pass little or no urine for 12 or more hours. You may

Diastolic pressure is the pressure of blood against the artery walls between heartbeats, when the heart is relaxed and filling

The diaphragm is a large sheet of muscle that separates the chest cavity (containing the lungs and heart) from the abdominal

Dialysis is a treatment for kidney failure that helps filter waste products from the blood when the kidneys are not working

Diabetes is a condition in which sugar (glucose) remains in the blood rather than entering the body's cells to be used for energy