Functional Dyspepsia is the term used to describe recurring upset stomach, bloating, discomfort or pain in the belly that occurs in people when there is no evidence of an underlying disease that is likely to explain the symptoms.
Symptoms include chronic or recurring pain in the upper abdomen often accompanied by bloating, discomfort and early satiety with meals. Functional Dyspepsia is a relatively common problem in North America affecting as many as 20% of adults.
Treatments include symptomatic medical management using acid suppression, prokinetics drugs, anti-gas preparations and neuromodulator drugs to reduce chronic pain.
More detailed information can be found here and at the Gastroparesis and Dysmotilities Association website.