Table 1.

The medical causes of UGB as per age group.

Causes of UGB as Per Age Group
Neonates	1–6 Months	6 Months–5 Years	5 Years and Older
Swallowed maternal blood *	Cow’s milk protein allergy	Mallory Weiss tears	Gastritis
Vitamin K deficiency	Esophagitis	Dieulafoy’s lesions	Esophagitis
Stress gastritis/sepsis	Gastritis	Esophageal varices	Peptic Ulcer
Trauma (Nasogastric tubes)	NSAID-induced ulcer	Gastric varices	Esophageal varices
Duplication cyst	Esophageal varices	Foreign body ingestion	Gastric varices
Necrotising Enterocolitis	Gastric varices	NSAID-induced ulcer	Crohn’s disease (rare)

* Swallowed maternal blood is not the cause of UGB but has the same clinical manifestations.