Cancer is becoming more and more common in modern times, and environmental pollution and food pollution may bring the risk of cancer. Early detection is crucial to the treatment of cancer, and 1/3 of cancers can be cured through early detection and diagnosis. 1. Unexplained wasting Sudden wasting is most common in breast cancer and lung cancer patients, others include liver cancer and intestinal cancer. If there is an inexplicable weight loss of 10% in a short period of time, you should seek medical attention promptly. 2.Frequent fever or infection Infections in the body can lead to fever, while unexplained persistent fever may be a sign of cancerous diseases such as lymphoma. 3.Weakness A variety of cancers may cause this symptom. If you feel weak and tired despite adequate sleep and rest, you should see a doctor. 4.Shortness of breath or breath Intense, obvious shortness of breath, chest pain or coughing up blood may be symptoms of lung cancer. 5.Chronic cough and chest pain Symptoms similar to cough or bronchitis may be symptoms of leukemia and lung cancer. Coughing and hoarseness for more than 6 weeks should be considered as laryngeal cancer, thyroid cancer, esophageal cancer or lung cancer. 6. bloating and abdominal pain Unexplained abdominal bloating should be borne in mind for ovarian cancer; severe pelvic distension and pain may be common symptoms of fibroids, ovarian cysts and other reproductive system diseases. In addition, inexplicable stomach pain or bloating after meals may be a sign of stomach cancer. 7.Chronic heartburn Long-term heartburn (heartburn) should be investigated whether it is caused by excessive stomach acid, and then the possibility of esophageal cancer and liver cancer should be investigated. 8.Intestinal problems Patients with intestinal cancer have more frequent stools and have the feeling of not being able to get rid of them. Early symptoms of pancreatic cancer are white and smelly stools. 9.Swallowing problem Mostly related to esophageal cancer and laryngeal cancer, difficulty in swallowing is sometimes one of the early symptoms of lung cancer. 10.Jaundice Sudden yellowing of the skin or whites of the eyes is mainly considered as liver or gallbladder disease, but it may also be a symptom of pancreatic cancer, bile duct cancer and liver cancer. 11.Abnormal lumps Abnormal lumps in breast, testicles, groin, neck, abdomen, armpit or other parts should be promptly investigated by medical doctors for cancer risk. 12.New skin spots or mole changes New skin spots or mole changes, or skin sores that do not heal for a long time, scabs but bleed easily should be considered as skin cancer. 13.Change of nail The appearance of brown or black streaks or spots under the nail should be considered as skin cancer. Suddenly larger finger ends and bent nails may be symptoms of lung cancer. Significantly white nails are sometimes a sign of liver cancer. 14.Long-term unexplained pain If you have unexplained pain for more than 4 weeks, you should be concerned about bone cancer or testicular cancer. 15.Abnormal bleeding Blood in urine may be a symptom of urinary tract infection, bladder cancer or kidney cancer. Blood in stool may be both hemorrhoid and bowel cancer symptom. Abnormal vaginal bleeding between menstrual cycles in women may be a symptom of endometrial cancer. Vomiting blood and coughing up blood should be beware of stomach cancer, esophageal cancer or lung cancer.