呕血可由多种疾病引起，以呕血为首发症状的流行性乙型脑炎（以下简称乙脑）病例，甚为少见．现将我院收治的1例报道如下．患者男，43岁．因呕血2天于1994年7月20日急诊入院．两天中在有轻度发热的情况下呕血3次，每次约200ml，伴有黑便、头痛及恶心．入院时又呕血1次．约100ml Hematemesis can be caused by a variety of diseases, with vomiting as the first symptom of encephalitis (hereinafter referred to as JE) cases, is very rare. Now in our hospital one case reported as follows. Male patient, 43 years old. Due to hematemesis two days in July 20, 1994 emergency admission. Hematemesis three times in two days in the case of mild fever, each about 200ml, accompanied by melena, headache and nausea. Hematemesis 1 time on admission. About 100ml