Our expert says:
There can be a number of reasons;
With exercise you can increase intra-abdominal pressure causing the pressure to build up in the abdomen. If you have a loose lower oesophagus, or hiatus hernia, then this increased pressure can causse food and fluid back up. This may improve with loss of weight. But also not to eat for at least 4 hours before exercise (eg do it in the AM after an evenings sleep)
However, it could also be from a heart origin especially if you get pain in the left arm as well.
get your GP to check it out.
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