When a cause for MUPS is found, the symptom(s) are no longer medically unexplained. Some cases of ulcers and dyspepsia were considered MUPS until bacterial infections were found to be their cause.
When a reason for MUPS is identified, the symptom(s) are no longer medically unaccounted. Some cases of ulcers and dyspepsia were classified as MUPS until bacterial infections were discovered to be their cause.