I have mild to moderate pains on the right side of my chest, under the nipple.  The pain is concentrated in an area about half the size of a fist.  It seems the pulse as well.  The pulse of pain will last a few seconds and then dissipate.  This will happen a few times and then go away for 30 - 60 mins.  Not sure what this is caused from.  I have not injured myself recently and this has been going on for about a month.
Thanks for your question on Chat Doctor. I can understand your concern. Well, in my opinion, we should first rule out cardiac cause for your chest pain because you are having pulsating chest pain. So get done ECG, 2d echo and stress test. If all these are normal then no need to worry about heart diseases. Sometimes without injury, pulled muscle is there. This is due to awkward sleeping position or bending or jerky movements. So follow these steps for better symptomatic relief in such chest pain. 1. Avoid movements causing pain. 2. Avoid bad postures in sleep. 3. Avoid heavyweight lifting and strenuous exercise. 4. Take painkiller like ibuprofen. 5. Apply warm water pad on affected areas. Don't worry, you will be alright with all these. But first rule out heart diseases. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.