Deep ache in the left shoulder. normal movement.
A deep ache in the left shoulder with normal movement is often due to muscle strain, poor posture, or overuse. Rest the shoulder, apply a warm compress, and do gentle stretching exercises; mild pain relievers can help if needed. Maintain proper posture, especially if you sit for long hours. If the pain persists, worsens, or is associated with chest pain, numbness, or weakness, seek medical advice promptly.