Many cancers come without any sound. Experts remind that the following 7 symptoms occur without pain, be alert because they are the early symptoms of cancer. Painless hematuria Blood in urine without abdominal pain is an early symptom of kidney cancer and bladder cancer. If blood in urine with abdominal pain is accompanied by abdominal pain, it may be urinary stones. Therefore, the difference between benign and malignant diseases mainly depends on the presence or absence of abdominal pain in the same hematuria. Painless breast lump A breast lump without pain, with uneven surface when touched by hand, without obvious boundary with surrounding normal tissues and with hard texture, suggests that it may be breast cancer. Painless vaginal bleeding In middle-aged and elderly women, if painless contact bleeding occurs suddenly, it may be a symptom of cervical cancer or uterine cancer. Painless nasal bleeding No symptoms such as headache, sore throat and nasal pain, but frequent blood or blood clots in the nasal mucus suggest the possibility of nasopharyngeal cancer occurrence. Painless skin keratosis Prevalent on the face and back of hands, with round rash-like skin changes, local flattening or slightly elevated, with brownish yellow or black crust attached to the surface, but no pain, which is a precancerous manifestation of skin cancer. Painless lymph node enlargement If one or more lymph nodes in the groin, submandibular, axilla, neck, back of occipital bone and around the ear are painlessly enlarged and hard, chronic lymphocytic leukemia or lymphoma should be alerted. Painless gastric ulcers Some elderly people with gastric ulcers have no abdominal pain but suddenly have black stools. Therefore, elderly people should try to do gastroscopy or upper gastrointestinal barium angiography during physical examination, if it belongs to painless gastric ulcer, early detection and early treatment can avoid cancer.