很早以前,医生们就困惑于引起癌症的原因,几千年来,研究者提出了各种各样关于癌症的假说。体液理论:古希腊医生希波克拉底(约公元前460～前377)认为人体有4种体液:血液、黏液、黄胆汁和黑胆汁。这四种体液平衡,人就健康;如果某一种太多或太少,都会引起疾病。这个说法被古罗马医生盖伦(129～199)发扬光大,认为癌症 Very early on, doctors were confused about the causes of cancer. For thousands of years, researchers have put forward a variety of hypotheses about cancer. Body Fluid Theory: Ancient Greek physician Hippocrates (circa 460 BC – before 377 BC) believed that the human body has four body fluids: blood, mucus, yellow bile, and black bile. If these four fluids are in balance, one will be healthy; if one is too much or too little, it will cause illness. This statement was carried forward by the ancient Roman doctor Galen (129-199) and considered cancer