Finger swelling after running may be caused by the following reasons: 1, due to longer running time and larger amplitude, the blood circulation of the arm is impaired, triggering finger swelling. 2, it may also be due to lumbar spine disease that presses on the nerves, leading to finger swelling. If the finger swelling is accompanied by itching, it is mostly due to the contact with certain allergic substances during running, causing skin allergy symptoms. 2, it may also be due to lumbar spine disease compression to the nerves, resulting in finger swelling. 3, it may also be due to renal disease, such as the glomerular filtration rate is lowered or due to the problem of their own insulin, which results in swelling. Finger swelling after running, patients had better go to the hospital in time.