<s>[INST] i have been getting a darting pain (lasting no nonger than a second) on the left saide of my chest for the past 16 hours. Sometimes 3 per minute and then a gap of perhaps two hours.   The dart is halfwaw between my left nipple and centre of chest. Have you any suggestions as to what it may be? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Darting pain on left side of chest should always be looked for heart diseases. So first get done blood pressure monitoring, ECG and 2d echo. If all these are normal then no need to worry about heart diseases. Sometimes pulled muscle can also cause similar kind of pain. So apply warm water pad on affected areas of chest. Take painkiller and muscle relaxant Chat Doctor. Avoid movements causing pain.Don't worry, you will be alright with all these. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>