<unk>  may be classified according to etiology into seven subtypes include gastrointestinal, neurologic, metabolic, endocrine, psychiatric, drug-induced, and idiopathic.
Constipation classification
Nausea and vomiting classification
Dyspepsia classification
Short bowel syndrome classification
Anal fissure classification
Peptic ulcer classification
Dysphagia classification
Anal fistula classification