Causes of sore and sleepy legs include physiological causes, lumbar spine diseases, and lower limb joint diseases. 1. Physiological reasons: walking or standing for a long time will cause fatigue and soreness in the lower limbs, which can be relieved after resting. 2. Lumbar spine diseases: lumbar spine diseases such as lumbar disc herniation, lumbar spine slippage, lumbar spinal stenosis, etc., which oppress the sciatic nerve and lead to the symptoms of soreness and fatigue of the legs, and need to be treated according to the specific conditions. 3. Lower extremity joint diseases: hip, knee, ankle and other osteoarthropathies can cause upper and lower extremities, heavy, aching symptoms, for the specific conditions of the treatment can alleviate the symptoms. There may be other causes of leg pain, if the leg pain is not relieved for a long time, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.