Cancer, as a chronic and frequent disease, also affects the normal physiological activities of the organism to a greater or lesser extent at an early stage, causing the organism to show certain symptoms or signs. Such as lumps, persistent indigestion, unexplained weight loss, persistent hoarseness, dry cough, difficulty in swallowing, unexplained bleeding from the nose, ears, bladder, intestines, and vagina. Even very mild symptoms can be a clue to diagnosing a tumor. Therefore, when certain symptoms appear in a certain part of the body, you should go to the hospital for examination. It is best to go to a hospital specializing in tumors to rule out the diagnosis of tumors. 1. One should go to the hospital immediately. Through the doctor’s comprehensive physical examination and detailed questioning of medical history, some tumors can often be detected and a preliminary diagnosis of their nature and further relevant examinations can be made. 2. Laboratory tests, including three major routine tests of blood, urine, stool and some specific laboratory tests. 3.Imaging examination, including x-ray, ultrasound, CT, magnetic resonance imaging and so on. 4.Various endoscopic examinations. 5. Cellular and pathologic examination, etc. Doctors selectively adopt certain methods of examination according to different nature and parts of tumors, so that tumor patients can get clear diagnosis and corresponding treatment in time. In addition, in order to achieve early detection and early diagnosis, it is necessary to educate the public about cancer, popularize the basic knowledge of cancer prevention, let everyone understand the causes of cancer, its early manifestations and methods of self-checking, and go to specialized hospitals for further examination and diagnosis in a timely manner when they find suspicious symptoms. For units and regions with the conditions, there should also be planned tumor census, which can achieve twice the result with half the effort.