Feet itch when it is hot, consider ringworm of the foot, frostbite, cholinergic urticaria and other diseases. 1. Tinea pedis: this disease is a common clinical infectious skin disease, mainly due to fungal infection. If the patient often wear breathable shoes, socks, or feet often sweat, will also induce the disease. The disease will lead to the patient’s feet appear peeling, dry, blisters with itching symptoms, and when the patient’s feet are hot, capillary expansion, the release of more inflammatory mediators, aggravate the itching symptoms, thus appearing feet itchy symptoms when hot. 2. Frostbite: usually associated with cold, and underweight, wearing tight clothing, skin exposure to cold environments and other factors can increase the risk of the disease. Generally can occur in the end of the limbs and exposed parts, can appear blisters, itching, purple and red plaques, etc., and some patients can also be accompanied by skin swelling, burning sensation, which can appear when the feet are hot, itchy phenomenon. 3. Cholinergic urticaria: mainly due to stress, alcohol, exercise and other factors to make the center of the body temperature, so that the cholinergic nerve impulses, appropriate acetylcholine, and the role of mast cells and the onset. And also with hot baths, emotional stress, eating spicy food and other factors. Patients often fever will appear after the skin erythema, wind mass with itching symptoms. Clinical can lead to patients feet itch when hot more reasons, it is recommended that the patient first seek medical examination to clarify the specific causes of the disease.