Having urticaria does not necessarily mean you have an allergy.

Urticaria is a common skin disease. Various factors cause temporary inflammatory congestion and massive fluid exudation in the blood vessels of the skin and mucous membranes. This causes local edema. It occurs and disappears quickly, with severe itching. There may be fever, abdominal pain, diarrhea or other systemic symptoms. So what types of urticaria are caused?

Types of hives that cause hives.

1. Non-allergic histamine release.

For example, some drugs (aspirin, morphine, sulfa drugs, penicillin, atropine, etc.) and other biological, chemical and physical factors can directly act on mast cells, causing them to release histamine and cause urticaria without going through an allergic mechanism.

2. Genetic factors.

Such as familial urticaria syndrome, delayed familial localized febrile urticaria, and hereditary vascular edema are relatively rare.

3. Direct stimulation of blood vessels can cause urticaria.

Some factors can directly stimulate blood vessels to dilate and produce urticaria, such as drinking, mental stress, insomnia, and drugs that can dilate blood vessels.

4. Cholestatic urticaria.

Warmth, exercise, emotional excitement, etc. can cause the choleretic nerve endings of the autonomic nervous system to release acetylcholine. Acetylcholine can directly cause vasodilation and can also promote the release of histamine, triggering urticaria.

What are the taboos in daily life for patients with measles?

Don't scratch: Most people's instinctive reaction to itchy skin is to scratch it immediately, but you may not know that this action not only cannot stop the itching, but may make the itching worse. This is mainly because when you scratch the itchy area, it will increase the local temperature and cause the blood to release more histamine (allergen), which will make the condition worse.

Don't use hot compresses: Some people want to use hot compresses when they are itchy. Although heat can make the local itching temporarily less sensitive, it is actually another kind of stimulation because heat can dilate blood vessels and release more allergens. For example, soaking in an overheated hot spring or bathtub, or wrapping in a heavy quilt to keep warm are likely to cause urticaria.

Avoid eating foods containing artificial additives, eat more fresh fruits and vegetables, and eat less fried, deep-fried, or spicy foods that are more likely to cause thermal reactions in the body.