Thumb numbness is mainly caused by lumbar spine diseases such as lumbar intervertebral disc herniation compression of the corresponding nerve root, various factors leading to the foot thumb nerve injury, peroneal nerve injury, diabetes mellitus and other factors.
1. Lumbar spine lesions: such as lumbar disc herniation, lumbar spine spondylolisthesis, lumbar spine tumor lesions and infected lesions, these causes will lead to lumbar spine nerve damage, thus causing numbness of the bunion.
2. Bunion nerve injury: such as nerve injury caused by cutting injury, excessive bunion caused by the finger nerve pulling.
3. Peroneal nerve injury: usually accompanied by the inability to dorsiflex the foot thumb, combined with electromyography can be clearly diagnosed.
4. Medical diseases such as diabetic foot: diabetes mellitus can cause peripheral neuropathy, resulting in numbness of the bunion, usually with a clear history of diabetes mellitus and poor glycemic control in the past.
If the numbness of the thumb is transient, it may be caused by physiological factors of excessive pressure, if the numbness is recurrent or more persistent, it is necessary to go to the hospital in a timely manner to diagnose and treat the cause of the disease, and rational treatment.