The reasons for sore and weak feet are: first, muscle strain caused by walking or standing more, which can be significantly relieved by rest. Second, may be due to lumbar disc herniation or lumbar spinal stenosis nerve compression, in addition to soreness will be accompanied by numbness, weakness, need to take lumbar spine MRI to see if there is compression of the nerve, if the compression of the nerve can apply nerve-nourishing drugs, do acupuncture, physical therapy. Third, if the feet are symmetrical acidity and weakness, caused by hypokalemia or hypocalcemia, it is necessary to test potassium, sodium, chloride, calcium, to see if there is a decrease in the phenomenon, if there is a decrease in the need to supplement these nutrients, later can be significantly relieved. Fourth, neurological diseases, such as cerebral infarction or cerebral hemorrhage causing hemiplegia symptoms on one side, in addition to foot weakness, can also be manifested as upper limb weakness, usually need to do cranial CT to further clarify.