I will make an appointment to go to GP so I am not expecting anyone to diagnose me but for some time I sometimes experience chest pains when exercising (usually on right hand side) Today I was walking fast up a steep hill and experienced a slight pain. It is usually a fleeting couple of seconds and passes it off and I guess it happens when I am quite out of breath. I had a ecg last year for palpitations but everything came back clear. I do seem to injure my chest muscles quite easily as I am very tiny but still lug a 4 year old around a lot. Does anyone else get chest pains from heavy breathing ie muscular or do you think it is more likely something to do with my heart.