What causes numbness in the tip of the left index finger?

Numbness in the tip of the left index finger is a common symptom that may be caused by various factors.

1. Prolonged improper posture: If the left index finger remains in one position for a long time, such as typing, holding a pen, or being compressed, it may lead to poor local blood circulation, causing numbness in the fingertip. This condition usually improves with rest and postural adjustment.

2. Nerve compression: The most common cause is carpal tunnel syndrome, where the median nerve becomes compressed at the wrist, possibly causing numbness or tingling in the fingers. Additionally, cervical spondylosis may compress the nerve roots in the neck, affecting sensation in the arms and fingers.

3. Cervical spondylosis: Degenerative changes in the cervical spine may compress the nerve roots of the upper limbs, leading to finger numbness. Symptoms may become more pronounced when moving the neck or changing posture.

4. Tendon sheath inflammation (tenosynovitis): Tenosynovitis is a chronic aseptic inflammation of the tendon sheaths in the fingers caused by mechanical friction. It mainly presents with joint pain, limited movement, and numbness in the fingers. People who use electronic devices such as computers and mobile phones for prolonged periods are more susceptible to this condition.

If discomfort occurs, prompt medical attention is recommended.