There is a piece of skin numbness on the back of the foot for reasons that vary from person to person, sedentary, squatting can cause poor blood circulation leading to numbness in the back of the foot, this situation can be alleviated after appropriate activities. Certain diseases can also cause numbness in the feet, patients should go to the hospital for examination to clarify the specific causes, the common causes of numbness in the back of the foot are three major categories: 1, skin ischemia: common local vascular sclerosis, vasculitis, saphenous varicose veins, etc.. Occlusive vasculitis can also appear dorsalis pedis artery pulsation weakened or disappeared, varicose veins can be accompanied by the appearance of lower limb cyanosis, veins cyanosis-like protrusion of the skin caused by bleeding rupture and other symptoms, patients should promptly seek medical attention, through the lower limb ultrasound and other tests can confirm the diagnosis; 2, nerve sensory abnormalities: sedentary, squatting or local pressure and other circumstances leading to poor blood circulation caused by numbness of the feet, patients can rest and adjust or hot compresses to observe Recovery, if the patient’s symptoms continue for several days does not subside, should promptly seek medical advice. Lumbar disc herniation compression of the sacral plexus nerve caused by numbness in the back of the foot, the patient can also appear dorsal foot nerve sensory numbness, pulling pain, weakness and other complications; 3, cerebrovascular disease: if the patient has numbness in the back of the foot and accompanied by numbness in the upper limbs, may also be cerebrovascular disease, should promptly consult the neurology department for symptomatic treatment. In addition, hypertension, diabetes caused by peripheral neuropathy, peripheral neuritis, etc. can also lead to a certain degree of numbness in the feet, but the specific cause should be diagnosed by the doctor after the appropriate examination. If the numbness of the back of the foot is caused by disease, patients should be properly treated under the guidance of a doctor, regular rest and rest, and can exercise reasonably, including walking and jogging after meals, to help recovery.