I have been having a pain in the left of my chest (behind, slightly above my left breast) on and off for over a year and half which I'm pretty sure is my heart; I've seen 2 doctors (one in the UK and one in Greece) and the first (UK) said she can hear a slight swishing sound but thought it was nothing to worry about as I'm very fit and active and the second (Greece) did an ECG and after asking if I am taking any drugs/medication (I'm not) he said that my heart beat appears slower than it should be but because of my age, I have nothing to worry about (I am 30, 5'.6", 11st.7lbs). Today the pain is quite acute and feels like my heart is bruised, or has been squashed during the night... today, it feels worse when I lift my left arm and move around to the right and also when I push my shoulders back when stretching my chest open, my breathing doesn't affect it. It's quite hard to explain the sensation... Recently (4 weeks ago) my father had a heart attack (he is 50), he had a steint fitted and feels much better now as he thought he had chronic indigestion for months and his father has also had 3 heart attacks (survived all of them and has a pace maker now) so I guess it is hereditary in our family. I do smoke which I am working on stopping! I am very active and always have been; I run for more than 30 minutes at a time, take spinning classes, swimming in the sea, yoga, weights and eat a very healthy diet of vegetables, fruits, fish, lean meats, lentils, beans, wholegrains etc... I live in Greece, by the sea and have a very idyllic lifestyle so wouldn't say I'm under any form of stress or worry! Before I take myself to hospital, I wanted to get some advice on what you think it might be and perhaps some tests that you could recommend I ask for.