What Causes Left Shoulder Pain?

Left shoulder pain may result from exposure to cold—for instance, if the shoulder becomes chilled, discomfort or pain can develop; thus, chilling of the left shoulder typically leads to left-sided shoulder pain. Stress or strain is another potential cause: lifting heavy objects with the left shoulder, for example, may lead to overuse injury or trauma, resulting in intra-articular damage—commonly involving tears of the glenohumeral ligaments or rotator cuff tendons. Alternatively, left shoulder pain may stem from pathologies affecting the shoulder girdle, such as adhesive capsulitis (frozen shoulder), rotator cuff injury, or calcific tendinitis—all of which commonly manifest as shoulder pain.

Cardiovascular disorders are also a notable cause of left shoulder pain. If cardiovascular disease is suspected, lifestyle modifications become essential: maintaining regular sleep-wake cycles (e.g., going to bed and waking early), avoiding late-night activities, and ensuring adequate rest. Chronic sleep deprivation not only imposes significant physiological stress but also impairs the body’s ability to efficiently eliminate metabolic waste and toxins. Prompt medical evaluation is crucial—patients should consult a cardiologist for comprehensive assessment. Diagnostic testing—including coronary angiography—may be warranted to precisely identify the nature and extent of any underlying cardiovascular pathology.