The most common causes of heavy body and tired soles are over-exercise, viral infections, prolonged braking and osteoporosis. 1. Excessive exercise: If the patient is engaged in strenuous sports, such as running a marathon, it is easy to cause lactic acid to accumulate in the muscles of the whole body, which in turn causes the body to be heavy and fatigue of the soles of the feet. 2. Viral infection: If the patient suffers from viral infection, with the progress of the disease can appear generalized symptoms, such as body aches and swelling, limb weakness, plantar fatigue, etc., and need to be timely antiviral treatment. 3. Prolonged braking: If the patient is bedridden for a long time due to other reasons, it is easy to cause the loss of muscle mass in the whole body and muscle atrophy, which in turn causes heavy body and tired soles. 4. Osteoporosis: this disease is prevalent in the middle-aged and elderly people, patients can show a slight pain in the whole body discomfort, may also show the body and the soles of the feet heavy. Caused by heavy body and feet feel very tired causes more, if the symptoms continue to no relief, it is recommended to go to the hospital in a timely manner to identify the cause of the disease, by the doctor targeted treatment.