Sore feet are considered to be caused by overwork, but it is not excluded that it is caused by flat feet, lumbar disc herniation, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Overexertion: If you have been walking frequently, standing for a long time or overworking recently, it may cause muscle strain, resulting in the accumulation of lactic acid and leading to the symptoms of sore feet. 2. Flat feet: Insufficiency of ankle muscles, tendons and ligaments caused by congenital or acquired factors, abnormal bone structure, inability to maintain the normal physiological structure of the foot arch, resulting in arch collapse, the formation of flat feet, walking too much can lead to symptoms of sore feet. 3. Herniated lumbar intervertebral disc: Degeneration of the intervertebral disc is the root cause of lumbar intervertebral disc herniation, which is related to the accumulation of injuries, pregnancy, hereditary factors and psychological factors. The herniated nucleus pulposus of the lumbar intervertebral disc compresses and stimulates the nerve roots, leading to numbness and soreness in the lower limbs, including the feet. Sore feet can also be caused by varicose veins in the lower limbs, sciatica, etc. If physiological causes are ruled out, you should consult a doctor in time to clarify the specific cause and get appropriate treatment if necessary.