Any blood pressure that is below the normal expected for an individual in a given environment. Low blood pressure is also referred to as hypotension.
Low blood pressure is a relative term because the blood pressure normally varies greatly with activity, age, medications, and underlying medical conditions.
Low blood pressure can result from conditions of the nervous system, conditions that do not begin in the nervous system, and drugs.
Neurologic conditions that can lead to low blood pressure include changing position from lying to more vertical (postural hypotension), stroke, shock, lightheadedness after urinating or defecating, Parkinson’s disease, neuropathy and simply fright.
Nonneurologic conditions that can cause low blood pressure include bleeding, infections, dehydration, heart disease, adrenal insufficiency, pregnancy, prolonged bed rest, poisoning, toxic shock syndrome, and blood transfusion reactions.
Hypotensive drugs include blood pressure drugs, diuretics (water pills), heart medications (especially calcium antagonists-nifedipine/PROCARDIA, beta blockers-propranolol/INDERAL and others), depression medications (such as amitriptyline/ELAVIL), and alcohol.
- Low blood sugar
A low blood level of the sugar glucose. Also called hypoglycemia. Hypoglycemia is only significant when it is associated with symptoms. It has many causes including drugs such as insulin, liver disease, surgical absence of the stomach, pre-diabetes, and rare tumors that release excess insulin.
- Low placenta
Location of the placenta in the lower part of the uterus (womb) so that the placenta partially or completely covers the cervix. Also known as a placenta previa.
- Low testosterone
Abnormally low levels of the male sex hormone testosterone in the blood. Testosterone is produced by the testes and to a lesser extent by the adrenal glands. Testosterone encourages the development of male sexual characteristics at puberty, stimulates the activity of the male secondary sex characteristics, drives the production of sperm, and is involved in […]
- Low vision
A visual impairment, not corrected by standard glasses, contact lenses, medicine, or surgery, that interferes with the ability to perform everyday activities. Low vision can be a result of eye conditions such as nystagmus, intraocular trauma, inflammation or retinal conditions such as diabetic retinopathy or age-related macular degeneration (AME). Low vision primarily affects people over […]
- Low vision device
A devise to help to improve visual ability of a person with low vision. Low vision devices may be optical or non-optical. Optical devices such as a magnifying glass involve the use of lenses to improve vision whereas non-optical devices such as large print help bring images closer to the eyes.