According to statistics, the incidence of most tumors tends to increase with age, and more than 51% of tumor patients are elderly people over 65 years old. Why is the incidence of tumors higher in the elderly? Medical research believes that there are several reasons as follows: (1) There is a large latent period before the occurrence of tumor. After the cancer-causing factors act on human body, the tumor will not develop immediately, and it is often necessary to go through the “latent period of cancer” of 15-30 years. (2) With old age, the body’s immune function is weakened, and thus the immune surveillance effect on lesions has been gradually reduced since the age of 40. The weakening of immune function is conducive to the occurrence and development of tumor. (3) The older you are, the more chances you will be exposed to cancer-causing factors, and the impact of cancer-causing factors on the body will be greater and greater, such as smokers, the longer the number of years of smoking, the likelihood of cancer will of course increase. (4) Lung cancer, stomach cancer, prostate cancer, colorectal cancer, cervical cancer, etc. in the elderly may be caused by a variety of chronic inflammatory diseases originating from the elderly themselves that have existed for a long time, chronic bronchitis, gastritis and ulcerative diseases, prostatitis, intestinal inflammation, inflammation of the cervix and so on. At present, although the occurrence of tumors in the elderly is unstoppable, it is possible to strive for early detection and early treatment. Tumors can appear some skin manifestations in the process of occurrence and development, and some manifestations will appear before the occurrence of cancer. Mastering the relationship between these skin lesions and tumor occurrence is of great significance to the early detection, diagnosis and treatment of certain tumors. Jaundice If the old people have jaundice without obvious reasons, they should be alert to the possibility of cancer of relevant organs in the body, such as liver cancer, pancreatic cancer, cholangiocarcinoma and gallbladder cancer. White sweat hairs are characterized by their sudden appearance, starting from the face and then spreading to the whole body and growing rapidly. Therefore, if you find that many white soft hairs suddenly appear on your face, you must check your body as soon as possible. According to the report, in the past 40 years, patients with hyperhidrosis cases all over the world invariably developed cancer, including lymph node cancer, liver cancer, breast cancer, cervical cancer, colon cancer and so on. 3.Erythema of the skin starts as erythematous papules, which are centrifugal enlargement, and the center gradually fades away, and it occurs on the trunk, especially on the buttocks, and the itching is obvious. This kind of skin lesion is mostly seen in breast cancer and lung cancer. There is also a kind of creeping gyriform erythema, which is in the shape of wood grain, can be moved and the morphology changes rapidly, and has obvious itching, which is mostly a comorbidity of breast cancer, lung cancer, and malignant tumors of head and neck. In addition, generalized erythroderma may be the early lesion of lymphocytic leukemia, Hodgkin’s lymphoma and malignant histiocytosis. 4, itchy skin, itchy skin all over the body, which is a common symptom of Hodgkin’s lymphoma, leukemia, myeloma and many other malignant tumors. 5, skin darkening Current research has found that pituitary tumor can cause melanocyte stimulating hormone secretion increase, leading to skin melanin increase, skin color darkening; malignant melanoma widespread metastasis, skin darkening; adrenal glands, if infringed by cancerous tissues, can lead to adrenocortical insufficiency, can not inhibit the pituitary melanocyte stimulating hormone, skin darkening will also occur. 6, spider sores medical name herpes zoster, manifested as a number of groups of dense small blisters in a band-shaped distribution on one side of the body. If the blisters are systemic distribution, herpes subsides still have severe neuralgia, lasting six months or more, should be alert to the possibility of malignant neoplastic lesions of internal organs. According to statistics, about 12% of cancer patients have herpes zoster-like lesions, and the older the patients are, the higher the rate of combination, mainly lymphatic system malignant tumors, stomach cancer, lung cancer, intestinal cancer, prostate cancer and esophageal cancer will also be accompanied by such lesions. 7. Acanthosis nigricans manifests as symmetrical melanin deposition in neck, armpit, perineum, umbilicus and other places, and local skin shows keratosis. The lesions are progressive and extensive, and the oral mucosal lesions are more closely related to cancer. Those who have this symptom should pay attention to check whether they have digestive tract tumor, especially gastric cancer. Dermatomyositis is an inflammatory disease characterized by symmetrical, progressive proximal muscle weakness and typical skin damage, which is manifested as purplish-red spots on eyelids, bridge of nose, cheeks, forehead and skin around nails. The incidence of visceral malignant tumor combined with dermatomyositis is 20%~30%, among which lung cancer is the most common. Keratinization of palm of hand is divided into two categories. One is diffuse keratosis, in which the whole palm and the abdomen of fingers are thickened with keratosis and slightly yellow color, and the esophagus should be examined because patients with esophageal cancer often have diffuse palm keratosis. Another kind of keratosis is punctate keratosis, i.e. the palm of the hand suddenly appears more pimple-like keratosis with small hard nodules, and the area of keratosis is harder when stroked with the hand. The breast, uterus, bladder, colon, etc. can be carefully examined in the context of one’s own situation, because cancers in these areas are likely to present with pitting keratosis of the palms. 10.Wandering phlebitis Symptoms of redness, swelling and pain in the venous area, characterized by wandering, are usually alleviated after 2 to 3 weeks. It is mostly seen in pancreatic cancer, especially pancreatic body cancer and pancreatic tail cancer. In addition, purpura is common in leukemia and myeloma; spider nevus is common in hepatocellular carcinoma; pestle finger is common in lung cancer; multiple warts in the elderly is common in gastric cancer; generalized vitiligo is common in prostate cancer; psoriasis-like keratosis of fingertips is common in carcinoma of upper whistling tract and so on.