正常人出血,除月经外,一般来说都是一种疾病现象,比如外伤、炎症、溃疡、血液疾病、癌肿等,都可以引起出血。癌肿会引起出血是因为它和人体的正常组织不一样,它生长迅速。在这些迅速生长的组织中,还会长出一些新生血管以供给组织营养,这种新生血管没有血管的调节机能,比较脆。如果肿瘤突出腔内,受到腔内细菌的感染,或者肿瘤组织本身脱落坏死,再 Normal bleeding, in addition to menstruation, in general, are a disease phenomenon, such as trauma, inflammation, ulcers, blood diseases, cancer, etc., can cause bleeding. Cancer causes bleeding because it is not the same as the body's normal tissue, it grows rapidly. In these rapidly growing tissues, there are also some new blood vessels that grow to feed the tissues. These new blood vessels have no vascular regulatory function and are relatively brittle. If the tumor prominent intracavitary cavity by bacterial infection, or tumor necrosis itself, and then