<s>[INST] I have been having intermittent chest pain for months. I've noticed that sometimes the pain is accompanied by indigestion, but not always. It hurts worse when I'm in bed and it often wakes me up at night. I was diagnosed with inappropriate sinus tachycardia about a year ago and take a beta blocker? Any ideas what could be causing this? [/INST] Hi welcome to HCM...As you have positive cardiac history , your case should be investigated through ....1.Blood pressure measurement 2.EKG 3.Echo (if needed )If any significant cardiac cause present than treated accordingly ....Meanwhile if you are suffering from gastritis like or acidity problem than also pain can occur as reffered pain....For that pantoprazole tablet given ....If still no significant cause found than pain can be musculoskeletal pain...Take care Advise : pulmonologist consultation </s>