But 1 in 1,000 African-Americans have the disease, which causes chronic episodes of debilitating pain.
The man suffers from a disease that causes recurrent episodes of total paralysis.
The knees may be affected, causing episodes of severe pain and swelling.
Some normal water use conditions may cause short episodes of discharge.
Excessive alcohol consumption can also cause episodes of incontinence in otherwise healthy adults.
Teeth which have caused multiple episodes of acute pericoronitis are more likely to benefit from removal.
It can cause serious, recurring episodes of wheezing and breathlessness, known as asthma attacks.
Make sure that any medicines you take for other problems are not causing episodes of high blood pressure.
Other dystrophies may cause repeated episodes of pain without leading to permanent loss of vision.
Things that cause asthma symptoms, episodes or attacks are called triggers.