One time I came back from a ski week with friends, I was feeling weak and had pain in my chest on the left. I fall gently on the floor and said to my friends I had pain on my heart, they panicked a little and quickly called the emergencies, I described my symptoms to the operator and they promptly told me it only was intercostal pain, that I should eat and rest for the day. The pain sometimes come back when I lift or run an move my arms, it is slythly annoying, I just hope it won't dull me from a real sign.