What causes numbness in the big toe?

Foot thumb numbness may be caused by various factors, mainly including:

1. Trauma: Such as being struck by heavy objects, compression, or cuts, which may injure the nerves that control the big toe, leading to local sensory abnormalities and numbness.

2. Nerve compression: For example, lumbar disc herniation may compress nerve roots, affecting nerve conduction in the lower limbs and causing numbness in the foot thumb. In addition, maintaining poor posture for long periods, such as crossing legs, may also compress local nerves, causing numbness.

3. Vascular abnormalities: Lesions such as vascular sclerosis, narrowing, or plaques may lead to insufficient arterial blood supply or embolism in the lower limbs, thereby causing ischemic numbness in the foot thumb.

4. Multiple peripheral neuritis: This condition can be caused by various factors such as nutritional and metabolic disorders or infections, leading to abnormal sensory and autonomic nerve function in the distal limbs, resulting in symptoms such as numbness and tingling.

5. Diabetes: Long-term high blood sugar may damage peripheral nerves, causing peripheral neuropathy, leading to numbness in areas such as the foot thumb.

If persistent or unexplained thumb numbness occurs, it is recommended to seek medical attention promptly.