Causes of Weakness and Soreness in the Left Arm in Women
Arm fatigue, weakness, and soreness are generally attributed to either physiological or pathological causes. So, what are the possible reasons for left-arm fatigue and weakness in women? Below, we address this question.

Causes of Left-Arm Fatigue and Weakness in Women
Common causes of left-arm fatigue and weakness in women include cervical spondylosis, adhesive capsulitis (frozen shoulder), and improper sleeping posture. Symptoms can often be alleviated through massage, acupuncture, and other conservative therapies.
1. Cervical Spondylosis
Prolonged forward head posture—such as when using smartphones or reading—can lead to straightening of the normal cervical lordosis and disc bulging in female patients. This may narrow the spinal canal and compress cervical nerve roots, resulting in fatigue, weakness, and soreness in the left arm. Acupuncture and massage may help relieve these symptoms.
2. Adhesive Capsulitis (Frozen Shoulder)
This condition involves injury or degeneration of soft tissues surrounding the shoulder joint—including muscles, ligaments, and tendons—and may cause left-arm fatigue, weakness, pain, and swelling. Treatment options include acupuncture, massage, topical analgesic plasters (e.g., pain-relieving patches), and anti-rheumatic, pain-relieving ointments.
3. Improper Sleeping Posture
Lying on the left side for extended periods during sleep may compress nerves in the left arm, impair local blood circulation, and lead to fatigue, weakness, and numbness. Gentle massage can help alleviate these symptoms.
The above outlines the primary causes of left-arm fatigue and weakness in women. We hope this information is helpful to you.