Possible reasons for numbness of the feet after running include over-tightened or improperly worn shoes, edema of the fascia or ligament, and foot fasciitis. 1. Too tight or improper shoes: It may be due to the shoes are too tight or improperly worn, resulting in insufficient blood supply to the feet, especially when running, due to the strong contraction of the muscles, so that it is difficult for the blood circulation to reach the end of the limbs, which will lead to numbness of the feet after running. 2. Edema of fascia or ligament: It may be because the fascia and ligament have been overstretched in the process of running, resulting in edema of the ligament or fascia, which may lead to numbness of the feet after running. 3. Plantar fasciitis: If you suffer from plantar fasciitis, and in the process of running, the foot movement time is too long or subject to excessive tension, resulting in muscle and fascia overstrain, may also appear after running foot numbness. There may be other reasons for numbness after running, if the symptoms are not relieved or gradually aggravated, it is recommended to go to the regular hospital in a timely manner to improve the relevant examination, to clarify the cause of the disease, under the guidance of the doctor for targeted treatment or treatment.