Sometimes shoulder blade pain can be a sign of a heart attack especially in woman.
Shoulder blade pain is usually only a sign of a heart attack when you experience other symptoms of a heart attack such as chest tightness, arm numbness, shortness of breath, sweating etc.
Most times shoulder blade pain is just caused by muscle strain or a pulled muscle and also bulging discs or herniating discs can also cause shoulder blade pain.
The shoulder blade pain should go away within a few hours but if it comes back or doesn't go away then a doctors visit is recommended to rule out anything more serious.