Body edema in hot weather may be caused by allergy, bacterial infection, renal insufficiency and other conditions. 1. Allergy: If the body is exposed to allergic substances in hot weather, it may trigger allergic symptoms, which may cause edema in the limbs, and may be accompanied by strong itching symptoms. 2. Bacterial infection: Bacteria can easily grow in hot weather, and if there is bacterial infection, it may cause edema under the influence of inflammation. 3. Renal insufficiency: If the patient has renal insufficiency, it will affect the normal excretion of the body, and the intake of hot water in hot weather is generally more, which may lead to excessive accumulation of water in the body, thus leading to edema in the body. There are a lot of circumstances that lead to edema in hot weather, so if you find edema in the body, it is recommended to go to the hospital as soon as possible to check the physical condition.