1. Interruption of awareness of oneself and one’s surroundings, lack of the ability to notice or respond to stimuli in the environment. A person may become unconscious due to oxygen deprivation, shock, central nervous system depressants such as alcohol and drugs, or injury.
2. In psychology, that part of thought and emotion that happens outside everyday awareness.
- Unconsciousness, temporary
Abnormal heart rhythms (heart beating too fast or too slow). Abnormalities of the heart valves (aortic stenosis or pulmonic valve stenosis). High blood pressure in the arteries supplying the lungs (pulmonary artery hypertension). Tears in the aorta (aortic dissection). Widespread disease of the heart muscle (cardiomyopathy). To be sure, many of the causes of temporary […]
- Under the weather
Colloquial expression for sick or ill as, for example, to be under the weather with the flu. The phrase “under the weather” came from British sailing ships. When a sailor became ill he was confined below deck out of the weather, so it was said that he was under the weather.
- Underwater weighing
A method for determining the lean body mass. This method weighs a person underwater and then calculates the lean body mass (muscle) and body fat. This method is one of the more accurate ones. However, it is generally done in special research facilities, and the equipment is costly. Also called hydrostatic weighing.
- Undifferentiated cancer
A cancer in which the cells are very immature and “primitive” and do not look like cells in the tissue from it arose. As a rule, an undifferentiated cancer is more malignant than a cancer of that type which is well differentiated. Undifferentiated cells are said to be anaplastic.
- Undulant fever
An infectious disease due to the bacteria Brucella that characteristically causes rising and falling fevers, sweats, malaise, weakness, anorexia, headache, myalgia (muscle pain) and back pain. The disease is called undulant fever because the fever is typically undulant, rising and falling like a wave. It is also called brucellosis after its bacterial cause. The disease […]