A group of headaches felt to involve abnormal sensitivity of the blood vessels (arteries) in the brain to various triggers, resulting in rapid changes in the artery size due to spasm (constriction). Other arteries in the brain and scalp then open (dilate), and throbbing pain is perceived in the head. Migraine headaches are the most common type of vascular headache.
See also migraine headache.
- Headache, thunderclap
A sudden and excruciatingly painful headache. Some physicians feel that in the absence of a known headache disorder, such as migraines, a thunderclap headache may sometimes signal a ruptured aneurysm in the brain. A person who experiences this type of headache should immediately seek medical attention.
As officially defined by the World Health Organization, a state of complete physical, mental, and social well-being, not merely the absence of disease or infirmity.
- Health care proxy
An advance medical directive in the form of a legal document that designates another person (a proxy) to make health care decisions in case a person is rendered incapable of making his or her wishes known. The health care proxy has, in essence, the same rights to request or refuse treatment that the person would […]
- Health for All
A global health movement undertaken by the World Health Organization (WHO) in the late 20th century. In 1977, the World Health Assembly decided that the major social goal of governments and WHO should be the attainment by all people of the world by the year 2000 of a level of health that would permit them […]
- Health outcomes research
Research that measures the value of a particular course of therapy.