According to WebMD, pain in the left arm or shoulder can indicate an injury, muscle strain, a degenerative disease, an instability in the joint, tendonitis, pinched nerves or a tumor. These causes occur equally on the le... More »

Pain in the left shoulder and rib cage potentially is caused by physical injury, spleen irritation, ulcers, costochondritis and heart complications, according to MedGuidance. A doctor should be consulted when sharp pains... More »

If you are experiencing unilateral pain in your neck, shoulder and arm, it could be the result of problems ranging from some form of arthritis, trauma or other nerve-related problem, explains WebMD and Cleveland Clinic. ... More »

Arthritis, tendinitis, rotator cuff injuries, broken bones and pinched nerves are possible causes of upper arm and shoulder pain, says Healthline. Some other causes include dislocation or separation of tendons and ligame... More »

Common causes for stabbing shoulder pain include fracture, arthritis, and instability or inflammation of the tendons, according to OrthoInfo. The pain associated with these conditions can also be dull or throbbing. More »

A sharp pain on the left side of the neck may indicate bone or joint abnormalities, poor posture, muscle strain, tumors or degenerative diseases, explains WebMD. An injury to the rotator cuff in the shoulder may also be ... More »

Possible causes of arm pain, which may affect the upper limb and start anywhere from the fingers to the shoulder, include an injury, overuse of the limb or referred pain from another body part, according to Healthline. A... More »