<s>[INST] Im a 50 year old female.  Today after church a man sitting 2 rows behind me that he could see my head moving slightly to the beat of my pulse.  Is this anything to be concerned about?  I have also had (for a few weeks) sharp pain in my chest. It hits me about onece a day and then is gone. [/INST] Thanks for your question on Chat Doctor. I can understand your concern. What you are describing is called as head nodding. Chest pain with head nodding are commonly seen with hypertension and heart diseases. So better to consult doctor and get done blood pressure monitoring, ECG, 2d echo and stress test (trade mill test). If all these are normal then no need to worry about heart diseases. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>