<unk>  and<unk>  can be classified into acute or chronic
Acute<unk>  which typically lasts from a few hours to few days is the most common presentation in the emergency department. Acute<unk>  needs an extensive workup to exclude life-threatening conditions like bowel obstruction, mesenteric ischemia, acute pancreatitis, and possibly myocardial infarction.
Chronic<unk>  which lasts from weeks to months is initially evaluated in an outpatient setting. Cyclical<unk>  syndrome is the most common cause of chronic<unk>  and<unk> .
Nausea and vomiting classification
Constipation classification
Bleeding classification
Dyspepsia classification
Headache classification
Anxiety classification
Lower gastrointestinal bleeding classification
Syncope classification