Pain beneath the left shoulder blade can be caused by side sleeping, poor posture when sitting at a desk and driving with bent elbows for extended periods of time, according to Fort Collins Massage. These positions increase pressure and create holding patterns in the shoulders that can result in pain.
Left shoulder blade pain can be caused by medical conditions, including heart attack, inflammation of the heart lining and certain cancers, explains Dr. Lynne Eldridge of About.com. Pancreatic conditions may also cause localized pain in the left shoulder blade. It is important for individuals to consult with a medical professional if symptoms of shoulder blade pain are persistent or accompanied by chest discomfort or breathing difficulties.
The underlying causes of shoulder blade pain are commonly diagnosed by visual examinations, medical history analysis and X-rays, according to the National Institute of Arthritis and Musculoskeletal and Skin Diseases. Shoulder blade pain caused by injury or strain can often be relieved with home remedies such as ice therapy and resting the shoulder for at least 48 hours. Wrapping the area with a bandage can help to minimize swelling and keep the shoulder immobilized. Additional treatments include corticosteroid injections, anti-inflammatory medications, ultrasound therapy and stretching exercises.