I am a 39 year old male, from the past few months I observed that while having one sip of alcohol it causes red face , red eyes and rapid heart rate. This seems the first time that has happened to me as I have been drinking for almost 10 years never such symptoms occurred. I have a slim body , go for running and exercise regularly. I did my full medical check , everything is right , as vegetarian which resulted in b12 deficiency, so I had few b12 shots. Right now I just stopped as it's causing more worry rather than pleasure. I read on web that it's something alcohol intolerance or asian flushing but don't know why it's happening now. Any advice or might be some allergy developed which is causing it.