The pain in the back of the foot is a very common clinical symptom, the specific causes can be analyzed through the following aspects: 1, lumbar disc herniation, because the nerves of the lower limbs are issued from the lumbar region, patients with herniated discs, nerve compression, will cause pain and discomfort in the corresponding parts of the lower limbs. 2, lower limb vascular problems, such as varicose veins, vasculitis, arteriosclerosis or vascular The pain is caused by the inaccessibility of the blood vessels and the lack of blood flow. 3, rheumatic pain, such as rheumatoid arthritis or rheumatoid arthritis, such pain is often aggravated when the weather becomes cooler, and there will be morning stiffness after waking up, and the pain will improve through a series of measures such as activity or warmth. The specific need to go to the hospital for further examination, clear diagnosis, through the lumbar spine CT or MRI, lower extremity vascular ultrasound or lower extremity angiography to further clarify the diagnosis.