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You must have developed a conditioned taste aversion to tuna fish. Eating tuna triggers a physiological response to throw it up because you must have eaten tuna when you were sick once or consumed bad tuna, which made you throw up, but only because you were sick or the tuna was bad. So now, every time you eat tuna, you throw it up automatically because you had a bad experience with it. The problem may not be the tuna at all or your GERD but purely psychological, which can manifest into physiological response (throwing up). A lot of us have conditioned taste aversions but it's something we're usually not aware of. And you can help yourself by trying to unlearn the conditioned response or fight your mind. Google Conditioned Taste Aversion and see what it's all about. Maybe that's what you're dealing with here :)

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Usually, heartburnThe most common symptom of acid reflux disease (also known as gastroespohageal reflux disease, or GERD). Heartburn feels like a burning pain in the center of the chest. It is caused by acid from the stomach backing up into the esophagus. is a symptom of acid reflux disease (GERD) Also known as Gastroesophageal Reflux Disease (GERD). Describes the condition of backflow of stomach acid into the esophagus which frequently happens when the lower esophageal sphincter (LES) relaxes more often than it should and/or at inappropriate times. The symptoms of acid reflux disease typically occur on 2 or more days a week.. And if you suffer from persistent heartburn on two or more days a week—and you’ve treated it and changed your diet—it could be due to acid refluxBackflow of stomach acid into the esophagus. Acid reflux frequently happens when the lower esophageal sphincter (LES) relaxes more often than it should and/or at inappropriate times. This allows harsh stomach juices to back up into the esophagus. disease. But only your doctor can tell you if these are signs of acid reflux disease.

You can never be too young for an acid reflux disease. It is also common in children. You can take Ranitidine HCL 150mg 3x a day for a period of 1 month. DO NOT skip meals and DO NOT aeat large meals, instead eat more frequent but take smaller portions. Avoid acidic food (sodas, coffee). STOP smoking.

It sounds like you have tried Tuna more than once and had the same reaction. It possibly could be from a food allergy rather than the acid reflux disease from eating Tuna.

So..

The most common symptom of GERD is persistent heartburn. Heartburn is experienced as an unpleasant and painful burning sensation in the esophageal area.

If you have already been diagnosed with GERD / acid reflux you can also try out this natural remedy http://www.goobypls.com/r/rd.asp?gid=568

Best

gees don't eat tuna fish. when people have acid reflux all ways eat early at least four hrs before bed time. an have the head of the bed raised four inch's or more i have mine 8=10 inches an of course eat food that is EASY on the stomach no hamburger meat or any thing that is hard to digest