Nausea and vomiting classification
Nausea and vomiting Microchapters
Nausea and vomiting classification On the Web
American Roentgen Ray Society Images of Nausea and vomiting classification
Risk calculators and risk factors for Nausea and vomiting classification
Nausea and vomiting can be classified into acute or chronic
Acute nausea and vomiting
Acute vomiting which typically lasts from a few hours to few days is the most common presentation in the emergency department. Acute vomiting needs an extensive workup to exclude life-threatening conditions like bowel obstruction, mesenteric ischemia, acute pancreatitis, and possibly myocardial infarction.
Chronic nausea and vomiting
Chronic vomiting which lasts from weeks to months is initially evaluated in an outpatient setting. Cyclical vomiting syndrome is the most common cause of chronic nausea and vomiting.
Based on the duration of symptoms it can be classified as
Acute nausea and vomiting can be caused by food allergies, viral gastroenteritis etc
It typically lasts from few hours to few days
Chronic nausea, vomiting can last from weeks to months. 
Chemotherapy is one of the most common cause of nausea and vomiting, and
Chemotherapy induced nausea and vomiting can be classified as
Acute Chemotherapy induced nausea and vomiting (CINV) occur with in 24 hours of chemotherapy administration
Delayed CINV can occur at least 24 hours after chemotherapy and peaks between 48-72 hours 
Nausea and vomiting that is triggered by stimuli associated withchemotherapy and can be due to prior poor control of nausea and vomiting during chemotherapy  
CINV that occurs despite maximum antiemetics
CINV that occurs within 5 days of chemotherapy despite of antiemetics. May require rescue therapy
- ↑ Lacy BE, Parkman HP, Camilleri M (May 2018). "Chronic nausea and vomiting: evaluation and treatment". Am J Gastroenterol. 113 (5): 647–659. doi:10.1038/s41395-018-0039-2. PMID 29545633.
- ↑ Navari RM (2003). "Pathogenesis-based treatment of chemotherapy-induced nausea and vomiting--two new agents". J Support Oncol. 1 (2): 89–103. PMID 15352652.
- ↑ . doi:10.1002/j.1875-9114.1990.tb02560.x. Missing or empty
- ↑ Jordan K, Kasper C, Schmoll HJ (January 2005). "Chemotherapy-induced nausea and vomiting: current and new standards in the antiemetic prophylaxis and treatment". Eur J Cancer. 41 (2): 199–205. doi:10.1016/j.ejca.2004.09.026. PMID 15661543.