Summer leg pain is considered to be caused by cold, muscle injury, rheumatoid arthritis and other reasons. 1. Catching a cold: the summer weather is hot, the patient wears less clothing or long time in the air-conditioned environment, resulting in the leg tissues are cooled, resulting in abnormal spasm of the local muscles, the symptoms of summer leg pain may occur. 2. Muscle injury: in the summer time, often outdoor sports, if the patient exercise excessively, resulting in local muscle injury, may appear summer leg pain symptoms. 3. Rheumatoid arthritis: when suffering from rheumatoid arthritis disease, summer rainy, humid weather more, will increase the sensitivity of local tissues, may cause the symptoms of summer leg pain. When the body appears uncomfortable symptoms, it is recommended to go to the hospital for examination and diagnosis in a timely manner, under the guidance of a professional physician to carry out targeted treatment, in order to avoid adverse reactions, the impact on the health of the body.