I am 22 year old male and Ive been experiencing tightness all the time in my rear left shoulder. Also there is a feeling of tightness or heaviness in the left side of my chest. It just a discomfort all day long and it wont stop bothering me. Also I have headaches everyday along with occasional tingling and loss of feeling in my left arm towards my hand. I never stop thinking about it and it always bothers me. Do you think it could be heart related? blood pressure is normal and i went in to the ER a while ago for chest pain, but they said everything was normal. It feels almost as if the left side of my body gets more blood than the right? any ideas??