It is very important to know what kind of conditions will occur in the body before cancer, because many patients come to the hospital after their symptoms appear, and then after examination and diagnosis, they are diagnosed with malignant tumor. If early detection and early treatment can be achieved, it is very important for the diagnosis of tumor. The following points are often suggested to patients: 1. cough persistently does not relieve: progressive aggravation, not cough symptoms or tumor. If the symptoms of cough appear, but they are not relieved continuously, and after a short period of time, such as 1 week, 2 weeks, 1 month, 2 months later, they are still not relieved, and in the process of coughing, the symptoms will continue to aggravate, and in the past, the cough was not accompanied by chest pain and wheezing, but now there is cough, chest tightness, chest pain and wheezing, which means that it is not relieved continuously and is aggravating, then we should suspect that it may be a malignant change; 2. Persistent unrelieved headache: In addition to headache, there was no dizziness but now there is dizziness, or there was no change in seeing things during the headache but now there is change in seeing things. Do not think that it is the usual cold pain or habitual pain, but make sure to do professional examination to clarify the treatment. 3. Frequent pain: Pain symptoms often occur in many patients, at many different times. If the nature of the pain has changed, the original vague pain, now become stabbing pain, stabbing pain and colic-like pain, the nature is changing, the scope of pain is expanding, after the pain and other symptoms, such as fever, dispersive pain, or pain to other parts of the shift, it is reasonable to suspect that it is not the previous pain, it is possible that the nature of pain is changing, to go to the hospital to do a comprehensive Weight: If weight loss is too fast, accompanied by continuous aggravation of symptoms and expansion of the scope of non-remission, we should suspect that the disease may have changed in nature, especially in a short period of time, there is no weight control, or no major physical exercise process, there is a more rapid weight loss, we should suspect the possibility of tumor.