Neck pain and stiffness can have many causes, but in most cases, the pain is a symptom of tight, tired, or injured muscles. However, an accident can lead to neck pain, as can poor posture and ...

Neck pain on the left side usually results from a benign cause, like muscle strain from sleeping in an awkward position. Sometimes, a more serious cause may be a tumor or rheumatoid arthritis. The ...

Neck pain and shoulder pain that occur together typically happen due to an injury, but it can also be due to certain health conditions, including a heart attack. Treatment can depend on the cause.