病历摘要：男.36岁主诉：纳差3个月。现病史：3月余前无明显诱因纳差，间伴有恶心、呕吐胃内容物，无呕血。<img src="/Image1/8b/8b8c9a5614c378ce4753cb5083f04272.jpg" /><img src="/Image1/7b/7bd6ee613f33b231354500ef851e4292.jpg" /><img src="/Image1/3e/3e48e09e420f2b503a8e941aa9473d38.jpg" /><img src="/Image1/2b/2b8ae7e414fe9eecf076b7b9159b802c.jpg" /> 2、诊断依据是什么？