Y'all are describing the symptoms of gastroesophageal reflux disease (GERD). The foods that cause symptoms (aka 'trigger foods') are numerous; per WebMD, the top 10 offenders are:
For some individuals, GERD is related to a chronic bacterial infection (Helicobacter pylori) in their stomach. Another risk factor for GERD is a hiatal hernia--a defect in the diaphragm at the junction of the esophagus and stomach that allows a portion of the stomach to slide through the diaphragm into the thoracic cavity. Who gets hiatal hernias?
There are several risk factors, one of which is repeated bouts of increased intra-abdominal pressure such as can occur during weightlifting. (Hmm, does that apply to anyone here?) I'm unable to find any data on the incidence/prevalence of H-H in weightlifters, but it's widely accepted to be higher than that of the general population.
GERD should not be taken lightly. In addition to causing discomfort, chronic GERD puts the sufferer at increased risk of esophageal cancer. (This risk goes up markedly if the sufferer is a smoker and/or heavy drinker.) Fortunately, in the vast majority of cases GERD can be controlled via lifestyle moderation and/or OTC meds. (A few individuals with GERD + H-H require surgery.)
I would encourage anyone who has experienced chronic and/or frequent GERD to mention it to their physician, who will likely recommend treatment, and maybe an upper endoscopy to check for pre-cancerous dysplasia of the lining of the lower esophagus (a condition called 'Barrett's esophagus').
(Edited for clarity)