The most common factor is infectious. 1. In summer, the feet are particularly susceptible to bacteria, viruses, fungi and other pathogenic microorganisms, such as mycoplasma and chlamydia, which cause localized redness, swelling, heat and pain, and are accompanied by joint dysfunction, resulting in very hot feet. 2, The clinical symptoms and manifestations of the increased basal metabolic rate, such as hyperthyroidism, will increase sweating and heat dissipation in the summer, resulting in particularly hot feet. 3, patients with peripheral neuritis, such as diabetes combined with peripheral neuritis of the foot, the nerves in the feet are abnormally sensitive in the summer, and there will be an increase in local heat production, the clinical symptoms and manifestations of particularly hot feet. The clinical symptoms and performance of the feet will be particularly irritable and hot.