<s>[INST] Hello! I have a question about a possible heart problem. As a teenager I was diagnosed with mitral (?) valve prolapse, which was causing some discomfort. I was told I would outgrow it and it never bothered me much. I am a 30 year old, generally healthy woman, my lifestyle is rather stressful (due to job). In the last year I have been getting episodes of heart palpitations (heart rate drastically increases for no apparent reason, feeling very tired and also having a tired feeling in the chest/heart area - I guess it could be pressure, it's just a feeling of tiredness, also in the left arm). 2 months ago I had a surgery due to rapture in which I lost 400ml of blood. I am taking Iron as a supplement and still feeling very tired most days. Could this be a heart problem that needs immediate attention? [/INST] Mitral valve prolapse is known to cause to palpitations. but the feeling of tiredness and weakness may be due to some other reason like low Hb!So please get yourself checked by a physician as you need certain blood tests like complete bleed counts, thyroid function test. Also an echocardiography to see the status of mitral valve prolapse as this can lead to leakage in the mitral valve in some people over a period of time. </s>