青年人大肠癌的临床表现不典型,易漏诊、误诊。近8年来,我们曾遇3例误诊为上消化道出血。现报告如下。例1:男,22岁。入院前3个月出现黑便,时有右上腹隐痛,在外院诊为上消化道出血,给予甲氰咪胍及去甲肾上腺素等治疗,未见明显效果。入本院后经胃镜检查未见明显异常,X线钡透... The clinical manifestations of colorectal cancer in young people are not typical, and are easily missed and misdiagnosed. In the past 8 years, we have encountered 3 cases of misdiagnosis of upper gastrointestinal bleeding. The report is as follows. Example 1: Male, 22 years old. 3 months before admission, there was melena, there was pain in the right upper abdomen. In the out-patient clinic, upper gastrointestinal hemorrhage was given. Treatment with cimetidine and norepinephrine was not effective. After entering the hospital, there was no obvious abnormality after gastroscopy;