Numbness of the lateral side of the thumb may be caused by physiological factors, acute injury, peripheral neuritis, lumbar spine lesions and other factors.
1. Physiological factors: for example, the lateral side of the thumb is subjected to persistent compression, which will cause numbness, should be lifted to relieve the compression, reasonable activities, numbness can disappear on its own.
2. Acute injury: Acute injury to the thumb area of the foot, resulting in local nerve damage, can cause numbness on the lateral side of the thumb, local pain, swelling and other symptoms.
3. Peripheral neuritis: it may be related to diabetes, prolonged alcohol consumption and other factors, which can lead to peripheral nerve damage, and then there will be numbness of the lateral side of the thumb, which may be accompanied by sensory loss, tingling and other symptoms.
4. Lumbar spine lesions: such as lumbar disc herniation, lumbar spinal stenosis, etc., after the aggravation of the lesion, it is easy to cause compression of the nerves innervating the lower limbs, after the damage to the nerves, can lead to numbness of the outside of the foot thumb, accompanied by radiating pain in the lower limbs, lumbar pain, numbness of the lower limbs and other symptoms.
Numbness of the lateral side of the thumb, the presence of other abnormal symptoms, exclude the physiological factors, it is recommended to consult a doctor in time for examination and treatment.