What is the reason for the erythema on the body when it is hot?

This is cholinergic urticaria. Cholinergic urticaria (heat type): It is a symptom of urticaria after heat. Sweating during exercise, sweltering indoors, taking a hot bath, the environment getting hot, the surrounding temperature rising, eating hot food or drink, the body temperature slightly rising when the spirit is excited, and the heated blood flow stimulates the brain temperature regulation center, excites cholinergic nerves and releases acetylcholine. It is precisely because people are allergic to acetylcholine that we call the symptoms caused by allergies cholinergic urticaria.

Symptoms and characteristics of cholinergic urticaria ① There is obvious acupuncture sensation and severe itching. ② Generally, it appears after encountering high temperature (hot drink, hot bath), emotional excitement and exercise. When you stop exercising or calm down, the symptoms can gradually subside. In severe cases, symptoms may take months or years to completely subside. (3) Red wheals of about 2 mm often appear on the skin of the trunk and proximal limbs (except armpits, palms and soles), and there is no trace after the wheals subside. Severe cases may be accompanied by digestive tract symptoms, such as abdominal pain and diarrhea.

When skin appears urticaria symptom, what method can let you alleviate temporarily?

Cold compress: local ice compress on the itchy part is the best way to fight skin itching, which can not only shrink local blood vessels, but also relieve itching, but only to stop itching.

Antipruritic ointment: Antipruritic ointment containing antibiotics and steroids.

What are the taboos in daily life:

Don't scratch: Most people's intuitive response to skin itching is to scratch with their hands, but you may not know that this action can not only stop itching, but also make the skin itch more and more, mainly because when you scratch locally, it will raise the local temperature and release more histamine (allergen) in the blood, which will aggravate the condition.

Don't apply hot compress: Some people itch enough to apply hot compress. Although heat can temporarily make local itching less sensitive, it is actually another stimulus, because heat will dilate blood vessels and release more allergens, such as soaking in overheated hot springs or bathtubs, or wrapping in thick quilts to keep warm, which can easily cause urticaria.

Avoid eating foods containing artificial additives and eat more fresh fruits and vegetables. Fried, fried or spicy foods are unlikely to cause thermal reactions in the body.

Urticaria is a physical problem, which is not easy to cure. In the past, many people had to let go because of the poor response to drug treatment. Anyway, people with urticaria constitution should learn how to get along with them, which is the fundamental way. In addition to avoiding contact with allergens, we should also pay attention to several principles in daily nursed back to health:

Eat more fresh fruits and vegetables rich in vitamins or take vitamins C and B, or B 6 in group B..

Eat more alkaline foods, such as grapes, green tea, kelp, tomatoes, sesame seeds, cucumbers, carrots, bananas, apples, oranges, radishes, mung beans and nuts.

Rest more, don't be tired, and exercise moderately.

congratulations