What causes numbness and cold sensation in the left arm?

Generally, coldness and numbness in the left arm may be caused by conditions such as periarthritis of the shoulder, cervical spondylosis, diabetes, and other diseases.

1. Periarthritis of the shoulder: People in certain professions, such as teachers, drivers, and chefs, often overuse their shoulder muscles, causing the muscles to remain fatigued for prolonged periods, which may lead to periarthritis of the shoulder. In addition to numbness and coldness in the arm, this condition may also present with swelling, pain, and difficulty lifting the arm. It is generally recommended to pay close attention and consider physical therapy under a physician's guidance.

2. Cervical spondylosis: Prolonged writing, computer use, or similar activities may lead to cervical spondylosis. Symptoms include headache, dizziness, and neck stiffness. As the condition progresses, it may cause numbness and coldness in the left arm, or even affect both arms. It is recommended to take medications such as Jingfukang granules or ibuprofen sustained-release capsules under medical supervision to relieve symptoms.

3. Diabetes: If a patient has diabetes, numbness and coldness in the left arm could be due to the disease. Diabetes can lead to peripheral neuropathy, manifesting as numbness, tingling, or burning sensations in the extremities. Treatment should be administered under a doctor’s guidance using medications such as metformin tablets or insulin.