When a person frequently suffers from signs and symptoms of indigestion, such as abdominal pain, bloating, belching, etc., for a month or more, and the doctor cannot determine the exact cause, it is called functional dyspepsia (FD). Dyspepsia means indigestion, and the term functional indicates that there is nothing wrong with the upper digestive system structurally, but still, symptoms appear. The signs and symptoms resemble a stomach ulcer, but there is no ulcer present. Therefore, FD is also called non-ulcer dyspepsia or non-ulcer stomach pain.
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