本文报告103例30岁以下青年人大肠癌,占同期大肠癌的8.75％,发病到确诊时间最短11天,最长9年。癌肿多位于直肠和乙状结肠(87.4％),有记录的63例直肠癌,其病灶距肛门9cm以下占95.2％,如对这类病人作常规肛门指检,80％以上可以发现病变。青年人大肠癌以恶性程度较高的粘液癌多见,占32.4％,较中、老年组6％为高。由于癌肿生长活跃,增殖迅速,短期浸润肠壁或有远处转移,较易出现肠梗阻症状(26.1％)。便血是最常见症状,早期容易误诊,本组病例大多数已属晚期,手术切除率为47.2％。 This article reports 103 cases of colorectal cancer in young people under the age of 30, accounting for 8.75% of colorectal cancer in the same period, the shortest onset time of 11 days, up to 9 years. The tumors were located in the rectum and sigmoid colon (87.4%). There were 63 rectal cancers recorded. The lesions were 95.2% below the anus and 9 cm below the anus. If routine anal examinations were performed on these patients, more than 80% of lesions could be found. Young people with colorectal cancer with high degree of malignancy are more common, accounting for 32.4%, higher than the 6% of middle and old age groups. Due to the active growth of cancer, rapid proliferation, short-term infiltration of the intestinal wall or distant metastasis, intestinal ileus symptoms (26.1%) are more prone to occur. Blood in the stool is the most common symptom. It is easy to be misdiagnosed in the early stage. Most of the cases in this group have been advanced and the surgical resection rate is 47.2%.