1. Problems with urination As men age, problems with urination are becoming more common, with frequent urination, urgency, or inability to urinate being more common. If the symptoms worsen, especially a strong sense of urgency to urinate, you should be alert to prostate cancer. Rectal fingerprinting should usually be done for prostate enlargement, which is the main symptom of prostate cancer. 2.Bloating Many women think that bloating is extremely common and no need to make a fuss. However, it may be a symptom of ovarian cancer. Continuous swelling, pressure and pain in the abdomen, gastrointestinal discomfort, difficulty in eating or a feeling of fullness that lasts for several weeks may be signs of ovarian cancer. Irregular bleeding Abnormal vaginal bleeding between menstrual cycles and bleeding from urine and feces are easily neglected by women. They are likely to be a big sign of endometrial cancer, a common gynecological cancer, and at least 3/4 of women with this sign have been examined for endometrial cancer. 4, inexplicable weight loss If there is no increase in exercise and no reduction in diet within a month, but the weight drops 10% inexplicably, you should consult a doctor in time. Sharp weight loss, anorexia and repeated diarrhea are the most common symptoms of lung cancer, stomach cancer, kidney cancer and colorectal cancer. Nasal discharge with blood Nasal discharge with blood is mainly manifested as a small amount of blood in nasal discharge, especially in the morning, which is often an important signal of nasopharyngeal cancer, and there is often nasal congestion, which is due to the compression of nasopharyngeal cancer mass. This is due to the compression of nasopharyngeal cancer mass. If the cancer presses the Eustachian tube, tinnitus will also occur, so bloody nasal mucus, nasal congestion, tinnitus, headache, especially one-sided migraine, are all dangerous signals of nasopharyngeal cancer. Fatigue Fatigue is a sign that cancer has developed, but for leukemia, intestinal cancer and stomach cancer, fatigue may be felt at the early stage of development. What is the difference between cancer fatigue and common fatigue? Generally speaking, ordinary fatigue will disappear after taking a rest, while cancer fatigue will find it hard to improve no matter how to take a rest. 7.Irritating cough If the inexplicable cough lasts for more than 3-4 weeks and gradually worsens with occasional bloody sputum and chest pain, you should see a doctor in time, which may be a sign of lung cancer or laryngeal cancer. Difficulty in swallowing Long-term difficulty in swallowing may be a sign of laryngeal cancer, esophageal cancer and stomach cancer, and you should receive X-ray chest X-ray or gastroscopy as soon as possible. The so-called dysphagia generally refers to the pain behind the sternum when eating, foreign body sensation in the esophagus, and the feeling of slow downward movement of food or even staying in the esophagus after swallowing food. Skin changes Sudden appearance of lumps or pigmentation on skin and obvious changes may be the signs of skin cancer. In addition, no matter how old or young you are, once your skin suddenly bleeds or peels abnormally, you should see a doctor. Changes in testicles Testicular cancer is most common in the age group of 20-39 years old. Men should self-check their testicles every month, including changes in size of testicles, obvious enlargement or shrinkage, appearance of lumps in scrotum, sensation of falling pain in scrotum, etc. Especially, if you feel falling and swelling in scrotum which lasts for more than a week, this is the most typical precursor of testicular cancer, and you should seek for doctor’s diagnosis at once. Blood in stool, blood in urine Besides hemorrhoids, blood in stool is likely to be a symptom of bowel cancer and should be screened by colonoscopy when necessary. Besides blood in stool, bowel cancer may also cause symptoms such as thinning of stool, increased frequency, and even cause difficulty in bowel movement. middle-aged and old people over 40 years old should be alerted to bladder cancer or kidney cancer if they have painless blood in urine or difficulty in urination. Headache and vomiting Headache occurs in the morning or at night, and is often obvious in the forehead, occiput and both sides. Vomiting has nothing to do with eating and often appears with the aggravation of headache. Headache and vomiting are common clinical symptoms of brain tumor, and should be regarded as danger signals of intracranial tumor. 13. Long-term unexplained fever. Cancers of hematopoietic system, such as malignant lymphoma and leukemia, often have fever. The clinical manifestation of malignant lymphoma is painless progressive lymph node enlargement, and the patient may have fever, emaciation, anemia and other symptoms at the same time. 14, breast lumps If women find redness of breast skin and lumps, they should be very careful. Non-lactating women, nipple depression, and often outflow of liquid, is also a bad sign. For men, if the breast skin is wrinkled, the nipple is contracted or asymmetrical, the nipple shape changes, and hard lumps appear in the breast, it may also be a symptom of breast cancer. 15. Pain Pain in a certain part of the body for no reason may be a sign of cancer. For example, long-term abdominal pain is a symptom of colorectal cancer, chest pain may be caused by lung cancer, pain under the right rib cage may be caused by liver cancer, and bone pain may be a symptom of cancer metastasis.