What reason is urticaria on the body long

summary

Now the most common problem is allergy, but many people will have urticaria allergy, urticaria common situation is itching, if you have urticaria what are the causes? Let's take a look at it.

What reason is urticaria on the body long

First: physical factors: if it is caused by physical and mechanical stimulation of external factors such as cold, heat, sunlight, friction and pressure.

Second: mental factors: mental tension or excitement, after exercise will cause the release of acetylcholine, causing urticaria.

Third: genetic factors: urticaria and heredity are related, such as familial cold urticaria, hereditary familial urticaria syndrome.

matters needing attention

Drugs are also one of the causes of urticaria. Drugs can be divided into two categories. One is the drugs that can form antigens, such as penicillin, serum, vaccine, sulfanilamide, furazolidone, etc. the other is histamine releasing agents, such as aspirin, morphine, codeine, pethidine, polymyxin, vitamin B, quinine, hydrabendazine, etc.