Latissimus dorsi muscle strain

A latissimus dorsi muscle strain is an overstretch or tear in a large back muscle, treated with protection, gradual movement and rehabilitation. Pain may appear in the side of the back, around the shoulder blade or near the armpit, especially during pulling or overhead activity.

The latissimus dorsi helps draw the upper arm down and backwards and contributes to trunk and shoulder control. A sudden pull, lifting effort, throwing motion or repeated training can overload it. Local tenderness, pain with resisted arm movement, weakness and muscle guarding may occur. Back muscle spasm can add a tight or gripping sensation.

A strain is different from ordinary muscle soreness after exercise, which often feels more diffuse and follows unfamiliar activity. The location and trigger still need an examination because shoulder, rib and spine problems can feel similar.

Pause the movement that caused pain and keep the arm and trunk gently mobile within a comfortable range. Cold or warmth may feel useful at different stages; protect the skin and stop if either worsens symptoms. Resume light daily activity gradually, then add stretching and strengthening when basic movement is comfortable. A physiotherapist can progress pulling and overhead work without a sudden load increase.

Arrange an assessment if pain is severe, bruising or swelling develops, strength drops noticeably, or symptoms do not begin settling with sensible activity changes. Seek urgent care after major trauma, or for chest pain, breathing difficulty, numbness, a visibly deformed shoulder or an arm that cannot be moved. Those signs may indicate an injury beyond a simple muscle strain.

Ask which movements should be limited, when strengthening can begin, whether imaging is needed, and how to return to swimming, climbing, lifting or sport. Mention any neck pain, lower back pain, thigh pain, calf pain or muscle cramps if they are occurring as well, since the wider pattern can guide assessment.