Have you done any activities that might have set off some severe muscle spasms?

Some of us on the thoracic outlet forum have had severe chest muscles spasms and/or the inter coastal nerve gets irritated and can cause a feeling like that.
Many have gone to ER and had all the tests for heart and come out as OK.
But it has to be checked out to be sure...

Do any of your upper back, neck or chest muscles feel very tight or locked up??
If it is and lasts days/weeks then it is most likely a spasm.