Why Does My Right Thumb Feel Numb?
Finger numbness, similar to many other parts of the body, is most prone to occur when compressed. If fingers become numb unexpectedly and frequently, it may be caused by an underlying disease. Clinically, many diseases share similar characteristics. It is advisable to understand them first, then make judgments based on your own condition or seek prompt medical attention. So, what could be the cause of numbness in the right thumb? Let's explore it together.
1. Peripheral Neuritis
Inflammation of the peripheral nerves in the fingers can be caused by poisoning, infection, vitamin B deficiency, or blood supply obstruction, leading to numbness and pain. This often occurs in both hands simultaneously and can be resolved after addressing the underlying cause. Oral or injectable vitamin B1, acupuncture, and other treatments can aid in recovery.
2. Ulnar Nerve Injury
Trauma, compression, or tumors affecting the ulnar nerve in the forearm and upper arm can cause numbness and pain in the little and ring fingers on the same side, as well as partial finger movement disorders. The ulnar nerve is particularly vulnerable to injury or compression at the ulnar groove in the posterior elbow. Most injuries gradually recover within about six months, but surgical intervention may be necessary in cases of tumors, complete ruptures, or severe compression.
3. Median Nerve Injury
Trauma, tumors, or compression affecting the median nerve in the forearm and upper arm can cause numbness and pain in the palm, thumb, index finger, and middle finger. The wrist is particularly susceptible to injury or compression, known as carpal tunnel syndrome, and the treatment principles are similar to the aforementioned cases.
4. Radial Nerve Injury
The radial nerve is vulnerable to injury in the middle and lower outer segments of the upper arm, resulting in numbness and pain on the back of the thumb and index finger, as well as finger and wrist drooping. The treatment principles are similar to the previous cases.
5. Brachial Plexus Injury
Lesions or damage in the axilla or anterior neck can cause mixed symptoms affecting all or part of the ulnar, median, and radial nerves. The treatment principles are similar to the aforementioned cases.
6. Cervical Spondylosis
Cervical vertebral hypertrophy, hyperplasia, or disc degeneration can compress the cervical nerve roots or spinal cord, leading to unilateral or bilateral finger numbness and pain. In severe cases, the entire arm and shoulder may experience intolerable numbness and pain, making it difficult to perform tasks like writing or knitting. If the numbness and pain disappear when the arm is relaxed and not in use, it suggests that the lesion is relatively mild.
