Does doxycycline cause burning in the middle of the chest, traveling up to the throat? It's really uncomfortable and I'm not sure if it's something I should be concerned about, or what I should do about it. Could it be acid reflux? I didn't know acid reflux/heartburn could be so intense... Does warm lemon water work or make it worse? I tried to eat some rice crackers but that didn't help. I'd appreciate ANY advice that you have! Thanks!