What is hot urticaria?

I believe everyone should be familiar with urticaria. It is a common skin disease, which often occurs in summer. Hot weather can also cause urticaria when the skin is stimulated by heat. Let's take a look at what is hot urticaria. Hot urticaria is a relatively rare urticaria. Thermal stimulation can induce the occurrence of thermal urticaria, especially in summer. How about hot urticaria? There are many kinds of urticaria, so patients should distinguish between them, recognize their symptoms and prescribe the right medicine. Therefore, it is necessary to introduce the symptoms of urticaria for timely diagnosis and treatment. The main symptoms of hot urticaria are: conscious itching, accompanied by abdominal pain, nausea, vomiting, chest tightness, palpitation, dyspnea, and a few symptoms such as fever, joint swelling, hypotension, shock, laryngeal edema and suffocation. The rash is wheal and flush, with different sizes and shapes. It often happens suddenly, appears in batches, and quickly fades after a few hours, leaving no trace after fading. But it will recur. The course of acute urticaria is less than 1 month; 1 month or more is chronic, and skin scratch test is positive in some cases. There are many factors that cause hot urticaria, mainly food: mainly animal protein foods, such as fish, shrimp, crab, eggs, milk and other seafood, are common pathogenic factors. Some fruits and vegetables can also be sensitized. Adding condiments, preservatives and pigments to food, and natural or synthetic substances in food can also cause urticaria. Drug-induced: Most drugs are caused by allergic reactions, and the common drugs themselves are histamine release agents, which can directly stimulate mast cells to release histamine and cause urticaria. Such as bacterial infection, fungal infection, viral infection and parasitic infection. The above is an introduction to urticaria fever, hoping to deepen everyone's understanding of urticaria and avoid this disease in peacetime. For patients and friends, knowing more about this knowledge can better treat diseases.