What are the causes of weakness and soreness in a woman's left arm?

Under normal circumstances, weakness and soreness in a woman's left arm may be caused by prolonged repetitive labor, improper posture, cervical spondylosis, shoulder periarthritis (frozen shoulder), multiple sclerosis, and other conditions. Treatment under medical guidance may include general management and medication. Specific causes are analyzed as follows:

1. Prolonged Repetitive Labor

Prolonged repetitive movements cause continuous muscle contraction, leading to the accumulation of metabolic byproducts such as lactic acid. When these substances build up excessively, they can stimulate muscle nerves, potentially causing soreness and weakness in the left arm. Muscle relaxation techniques such as warm compresses and massage may help improve blood circulation.

2. Improper Posture

Incorrect posture may place muscles and nerves under abnormal tension. Prolonged pressure can interfere with nerve signal transmission, preventing the muscles in the left arm from receiving proper neural commands, resulting in feelings of fatigue and weakness. It is important to improve work and lifestyle habits by changing body positions regularly and avoiding maintaining the same posture for extended periods.

3. Cervical Spondylosis

Cervical spondylosis is generally a degenerative condition affecting the cervical spine. Changes in the cervical vertebrae can impair the function of spinal nerve roots. When these nerves are compressed, the muscles they control may lose normal innervation, possibly leading to weakness and soreness in the left arm. Symptoms may include neck pain, numbness in the fingers, and dizziness. Patients may use medications such as ibuprofen gel, Jingkang capsules, or eperisone hydrochloride tablets as directed by a physician.

4. Shoulder Periarthritis (Frozen Shoulder)

Shoulder periarthritis is usually caused by chronic shoulder injury. In female patients, inflammation and adhesions in the soft tissues surrounding the shoulder joint may restrict joint movement. When the left arm is moved, it may experience pulling and strain, leading to sensations of weakness and soreness. Symptoms may also include shoulder pain, stiffness, and limited range of motion. Treatment should follow medical advice and may include medications such as loxoprofen sodium tablets, Huoxue Zhitong capsules, or celecoxib capsules.

5. Multiple Sclerosis

Multiple sclerosis is typically triggered by factors such as viral infections, autoimmune responses, genetic predisposition, and environmental influences. In this condition, the immune system mistakenly attacks the myelin sheath surrounding nerves. Damage to the myelin slows nerve conduction, potentially causing muscle weakness and coordination difficulties, which may manifest as the symptoms described. Other possible symptoms include blurred vision, balance problems, and muscle spasms. Treatment should follow medical recommendations and may involve medications such as methotrexate tablets, dexamethasone acetate tablets, or prednisone tablets.

In daily life, it is important to get adequate rest, avoid spicy or irritating foods, and engage in regular exercise to strengthen the immune system.