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Hyperparathyroidism is overactivity of the tiny glands in the neck that are next to the thyroid gland (parathyroid glands). The

Hyperthyroidism means that your body has too much thyroid hormone, which controls how your body uses energy. Too much thyroid

Hyperventilation is breathing that is deeper and more rapid than normal, which causes the amount of carbon dioxide (CO2) in the

The hypothalamus is a region of the brain that regulates sleep cycles, body temperature, pituitary gland activity, and other

Hypothyroidism happens when your thyroid gland doesn't make enough thyroid hormone. Thyroid hormone controls the way your body

Hysteroscopy is a procedure that allows a doctor to look at the inside of the uterus. During hysteroscopy, a lighted viewing

Hysterectomy is the surgical removal of the uterus. It is done to treat certain gynecological conditions, such as endometriosis

A person with diabetes uses a home blood sugar (glucose) test to measure the level of glucose in their blood. The test can be done

Hyperbaric oxygen therapy is a treatment to increase a person's blood oxygen level, which can prevent tissue death, promote

Heart valve disease occurs when a heart valve is damaged or narrowed and does not control or allow the normal flow of blood