Hamartoma
A benign (noncancerous) tumor-like growth consisting of a disorganized mixture of cells and tissues normally found in the area of the body where the growth occurs.
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- Hamartoma, hypothalamic
A benign tumor of the hypothalamus, the area of the brain that controls body temperature, hunger, and thirst. (In technical terms, the hypothalamus lies beneath a structure known as the thalamus and forms the floor of the third ventricle of the brain.) A small hypothalamic hamartoma can cause the patient to feel as though they […]
- Hammer toe
A condition in which the toe is flexed (curly), but with no abnormal rotation of the toe. Hammer toe may require surgical correction.
- Hamstring
One of the prominent tendons at the back of the knee. The hamstrings are the side walls of the hollow behind the knee (popliteal space). Both hamstrings connect to muscles that flex the knee. The term is sometimes used to refer to the muscles in the back of the thigh. A pulled hamstring is a […]
- Hand, foot, and mouth disease
A common illness of infants and children under 10 years old characterized by fever, sores in the mouth, and a rash with blisters due to infection most commonly with coxsackievirus A16 or less often enterovirus 71 or another enterovirus. The disease begins with a mild fever, poor appetite, malaise (“feeling sick”), and frequently a sore […]
- Hand-arm vibration syndrome
A disorder resulting from prolonged exposure to vibration, specifically to the hands and forearms while using vibrating tools. Symptoms include numbness, tingling, and loss of nerve sensitivity. The hand-arm vibration syndrome (HAVS) is a painful and potentially disabling condition of the fingers, hands, and arms due to vibration. There is initially a tingling sensation with […]