Rheumatoid arthritis for more than 20 years foot numbness, may be physiological factors, rheumatoid arthritis peripheral neuropathy, lumbar intervertebral disc herniation, diabetes and other factors. 1. Physiological factors: rheumatoid arthritis patients in the daily poor posture, may lead to the feet of the blood flow is impeded, there will be physiological numbness of the feet, adjust the bad posture will be improved on their own, only occasionally, and rheumatoid arthritis has little to do. 2. Rheumatoid arthritis peripheral nervous system lesions: rheumatoid arthritis treatment is unreasonable, the lesions continue to aggravate, may cause peripheral nervous system lesions, resulting in damage to the nerves innervating the feet, which will cause numbness. 3. Lumbar intervertebral disc herniation: foot numbness may also be related to other lesions, such as lumbar intervertebral disc herniation, which may also be accompanied by lower extremity radiating pain, numbness of the lower extremities, lumbar pain and other symptoms. 4. Diabetes: diabetes, blood sugar repeatedly increased, may cause peripheral neuropathy, there will be numbness of the feet, numbness of the hands, accompanied by fatigue, drinking and other symptoms. Rheumatoid arthritis for more than 20 years foot numbness, accompanied by other discomforts, it is recommended to seek medical examination and treatment, to avoid aggravation of lesions.