I feel hot, and my back and head will itch very much. How can this happen?

According to the description, it can be preliminarily diagnosed as cholinergic urticaria, which belongs to a kind of rash that people often say. When heated, nervous, eating hot food or drink, or after exercise, the body temperature slightly increases cholinergic urticaria. If you are allergic to this chemical, an allergic reaction will occur.

there will be no rash, but you obviously feel acupuncture and itching. Most of them occur in youth, and usually appear after encountering heat (hot drinks, hot baths), emotional excitement and exercise. When you stop exercising or calm down, the symptoms will subside. In severe cases, it may take months or years for the symptoms to completely subside.

The main treatment is to avoid contact with allergens. Oral chlorpheniramine can relieve it, and antiallergic drugs can be used appropriately.

Pay attention to control emotions and avoid strenuous exercise at ordinary times.

some vitamins b and c can be taken orally, which has an auxiliary therapeutic effect. Vitamin B1, also known as thiamine, can inhibit cholinesterase activity, reduce skin inflammatory reaction, prevent and treat seborrheic dermatitis and eczema, and improve skin health. Try to have a light diet, don't smoke and drink, avoid spicy, greasy and sweet food, and eat more fruits and vegetables.