What causes numbness in the left little finger?

Generally, numbness in the left little finger may be caused by poor blood circulation, prolonged poor posture, peripheral neuritis, ulnar nerve entrapment syndrome, or cervical spondylosis of the nerve root type. It is recommended to seek timely medical attention and follow medical advice for treatment. Details are as follows:

1. Poor blood circulation: Maintaining the same posture for extended periods of work or exerting pressure on one limb may lead to poor peripheral blood circulation. Affected by impaired venous blood return and insufficient oxygen supply to tissues, symptoms such as numbness and soreness in the left little finger may occur. Appropriate movement of the left hand, along with local massage or heat application, can help improve blood circulation. For heat application, a wrung-out hot towel can be placed on the affected area for 10–15 minutes, repeated 2–3 times daily.

2. Prolonged poor posture: Maintaining the same posture for extended periods, such as prolonged fist clenching or excessive wrist use, may intensify discomfort in the left little finger, leading to nerve compression or impaired blood circulation, accompanied by hand fatigue. Regular rest and appropriate hand exercises can help relax muscles and avoid prolonged static postures.

3. Peripheral neuritis: Factors such as poisoning, infection, or impaired blood supply may trigger peripheral neuritis, causing numbness in the left little finger. Inflammation of the peripheral nerves may lead to abnormal nerve conduction and may be accompanied by a burning sensation in the hand. Under medical guidance, medications such as vitamin B1 tablets, mecobalamin tablets, or dexamethasone acetate injection may be used to nourish the nerves and reduce inflammation.

4. Ulnar nerve entrapment syndrome: Compression or trauma to the ulnar groove behind the elbow joint may cause ulnar nerve entrapment, resulting in finger numbness. Compression or injury of the ulnar nerve at the elbow may lead to abnormal nerve conduction and may be accompanied by weakness in the hand. Under medical guidance, medications such as ibuprofen sustained-release capsules, celecoxib capsules, or indomethacin sustained-release capsules may be used for antipyretic and analgesic effects.

5. Cervical spondylosis of the nerve root type: Lesions caused by cervical disc herniation compressing the cervical nerve roots may lead to numbness and pain in the left little finger. Nerve root compression caused by cervical spondylosis may result in abnormal nerve conduction and may be accompanied by neck pain. Medications such as glucosamine hydrochloride capsules, calcium gluconate oral solution, or diclofenac sodium sustained-release tablets may be used as directed by a physician.

It is important in daily life to maintain good habits, including proper lifestyle and dietary practices, and to avoid prolonged computer use.