Asymptomatic small intestinal ulcerative lesions: Obesity and Helicobacter pylori are likely to be risk factors

Table 4 Disease and/or cause of small intestinal ulcer with multiple reports

Category	Disease and/or cause	Ref.
Inflammatory disease	Crohn’s disease	Gomollón et al[3], 2017
	Behçet's disease	Lee et al[23], 2012
	polyarteritis nodosa	Perlemuter et al[24], 1996
	Schönlein-Henoch purpura	Nishiyama et al[25], 2008
Vascular disease	Ischemic enteritis	Iwai et al[26], 2018
Systemic disease	Amyloidosis	Tada et al[27], 1994
Heridetary disease	Chronic enteropathy associated with SLCO2A1 gene	Umeno et al[28], 2015
Bacterial infection	Yersinia enterocolitica	Matsumoto et al[29], 1990
	Campylobacter jejuni	Duffy et al[30], 1980
	Salmonella typhi	Goel et al[31], 2017
	Salmonella typhmurium	Boyd[32], 1985
	Salmonella enteritidis	Dworkin et al[33], 2001
	Mycobacterium tuberculosis	Lu et al[34], 2020
Viral infection	Epstein-Barr virus	Watanabe et al[35], 2020
	Cytomegalovirus	Matsumura et al[36], 2020
	COVID-19	Sahu et al[37], 2021
Drug induced	Various drugs included NSAIDs	Scarpignato and Bjarnason[38], 2019
Immunodeficiency	Acquired immunodeficiency syndrome	Zeitz et al[39], 1998
	Graft-versus-host disease	Peled et al[40], 2016

Reference searched as much as possible for new, review, and important ones. COVID-19: Coronavirus disease-2019; NSAID: Nonsteroidal anti-inflammatory drugs.