Numbness of the right foot may be caused by keeping a posture for a long time, which is a normal physiological phenomenon. It may also be caused by lumbar disc herniation, ankle joint lesions and diabetes. 1. Normal physiological phenomenon: If you sit for a long time or sleep on your stomach, it may trigger the symptoms of numbness of the right foot, and it will be relieved after changing the posture. 2. Lumbar disc herniation: when the lumbar disc degenerative changes, the protruding nucleus pulposus compresses the surrounding nerve roots or spinal cord, and the symptoms of pain and numbness in the right foot will appear. 3. Ankle joint lesions: If you suffer from ankle joint lesions such as ankle arthritis and soft tissue lesions around the ankle joint, it may lead to compression of the nerves and symptoms of numbness in the right foot. 4. Diabetes: right foot numbness may be caused by diabetes, diabetes can cause peripheral neuropathy, nerve damage in the foot, manifested as numbness. The symptoms of numbness of the right foot is excluded from the physiological phenomenon, you should go to the hospital in a timely manner to do the relevant examination, to avoid delaying the condition of the adverse consequences.