For patients with numbness in the foot thumb, i. Crush injuries in the thumb area, thus causing significant swelling, bruising, pain and numbness in the thumb area. Second, patients with lumbar disc herniation, especially patients with lumbar 4-5 disc herniation, which leads to nerve root compression, will cause obvious numbness in the foot bunion and weakness in the dorsal extension of the bunion. Third, nerve damage in the thumb area of the foot, resulting in weakened nerve conduction, causes significant numbness in the thumb of the foot. Fourth, poor peripheral circulation in the thumb area, a condition that can also lead to impaired blood supply to the nerves in the thumb area, causing spasm and resulting in numbness in the thumb. Fifth, seen in patients with diabetes, this condition can also lead to damage to the peripheral nerves of the thumb, thus causing numbness in the thumb of the foot.