Heat urticaria, also known as cholinergic urticaria, is a type of hives. It is caused by the release of acetylcholine due to high heat, which acts on mast cells and can be relieved by lifestyle adjustments and medication. Cholinergic urticaria is caused by high body surface temperature, and common triggers include hot baths, emotional stress, hot weather, and eating spicy food. So don’t eat spicy food and avoid strenuous exercise. When symptoms appear, you need to take anti-allergic drugs, such as levocetirizine tablets, compound glycyrrhizin tablets and so on. If the effect of medicine is not good, you can cooperate with hormone for short-term treatment, such as oral prednisone and other drugs. Usually pay attention to stay away from allergens. For example, avoid taking hot baths, so as not to irritate the affected area and aggravate the symptoms.