My dad s has a history of an MI about 6 years back, and a stent placement a couple of years ago and most recently, 3 months ago he had another stent placed in. But since then he s been having some left shoulder pain and chest pain and was admitted to the hospital for a possible heart attack. The cardiologist at the hospital did a cath lab and found everything to be okay, and that it wasn t a heart attack. After the cath lab my dad s shoulder pain diminished, but now that about a month s passed since his admission his shoulder pain is back and his cardiologist say that it s not heart related. He also complains a bit of chest pain as well, and the pain is usually exacerbated by extreme temperatures. I would like to know what you think is a possible explanation. Thank you.