An uncommon type of hives (urticaria) that occurs after the skin has been under pressure, often the feet after standing or the buttocks after sitting for a long time or areas where clothing is tight. The hives may begin hours after the pressure on the skin has ceased. The hives last 8 to 72 hours and may be painful, itchy, or burning. They may be accompanied by low fever, chills, fatigue, joint and muscle aches, and/or headaches. Triggers include pressure from using tools (such as a screwdriver or a hammer), clapping the hands, carrying a bag or suitcase, sexual intercourse, and the use of tampons. Antihistamines may not help. Nonsteroidal anti-inflammatory drugs (NSAIDs) or oral steroids may be used. The disease tends to be chronic and last for years. The cause is unknown.
- Pressure, intraocular
The pressure created by the continual renewal of fluids within the eye. The intraocular pressure is increased in glaucoma. In acute angle-closure glaucoma, the intraocular pressure rises because the canal into which the fluid in the front part of the eye normally drains is suddenly blocked. In chronic glaucoma, there is a gradual imbalance between […]
- Pressure, low blood
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 proportion of individuals in a population having a disease or characteristic. Prevalence is a statistical concept referring to the number of cases of a disease that are present in a particular population at a given time, whereas incidence refers to the number of new cases that develop in a given period of time.
Abnormally persistent erection of the penis in the absence of desire. Treatments include medications, anesthesia, and drainage of blood from the penis.
- Preventive medicine
Medical practices that are designed to avert and avoid disease. For example, screening for hypertension and treating it before it causes disease is good preventive medicine. Preventive medicine takes a proactive approach to patient care.