You didn't say your age or gender but if you are a female between 30-48 (give or take a few years either side) you may be experiencing perimenopause. I am no doctor but that is the only thing that has caused me to have this symptom. I am always saying, "Is it hot in here, or is it just me?" After a battery of tests I learned that I am going through perimenopause.
It would not be safe for any of us here at the forums to tell you that it is GERD or a digestive problem. You can't diagnose yourself with one symptom for any condition.
Having said that I will say that since I was diagnosed with GERD I have researched ALOT and have not heard of this being a symptom. Best thing to do would be to write down any other symptoms you might be having and take the list to your doctor and let him/her give you a proper diagnosis.
I told my psychiatrist that everyone hates me. He said, "That cannot be true. You haven't met everyone yet!"