Heartburn will appear when the sphincter muscle at the lower end of the esophagus to the stomach does not work properly and it doesn't close. Therefore, the acidic gastric juices can flow back again, producing this nasty burn behind the breastbone. This dysfunction of the locking mechanism can occur when too much pressure is exerted on the abdominal cavity, for example in a bad body condition, pregnancy or even overweight.
Heartburn
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