<s>[INST] I had an endoscopy 10 days ago with biopsies. Diagnosed with GERD, hiatal hernia, and Barrett s esophagus. I have been taking nexium 40mg daily and made dietary changes. My reflux seems well controlled, but I have a constant burning in my chest which was not there before the procedure. Any clue what this could be? Could this be from the biopsies? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Yes, biopsies can cause similar kind of burning sensations. Biopsy sites will cause burning when they come in contact with stomach acid. So burning is expected up to 2 weeks after Biopsy. Along with medium and dietary changes, you should follow these steps also for better symptomatic relief. 1.  Go for walking after meals. 2.  Chat Doctor.  </s>