Lung cancer is one of the malignant tumors with the fastest growing incidence and mortality rate and the greatest threat to the health and life of the population, and it also tops the list of tumors that men are vulnerable to. In the past 50 years, many countries have reported a significant increase in the incidence and mortality of lung cancer, with men accounting for the first place in incidence and mortality of all malignant tumors, and women accounting for the second place in incidence and mortality. The cause of lung cancer is still not completely clear, but a lot of information shows that long-term heavy smoking has a very close relationship with the occurrence of lung cancer. Studies have proven that long-term heavy smokers are 10-20 times more likely to develop lung cancer than non-smokers, and the younger the age when smoking begins, the higher the chance of developing lung cancer. In addition, smoking not only directly affects one’s own health, but also has a negative impact on the health of the surrounding population, leading to a significant increase in the prevalence of lung cancer in passive smokers. The incidence of lung cancer is higher in urban than rural areas, which may be related to urban air pollution and the presence of carcinogenic substances in the smoke. Therefore, we should promote non-smoking and strengthen urban environmental health. Urological system tumors Urological system tumors refer to tumors that occur in any part of the urinary system. They include tumors of kidney, renal pelvis, ureter, bladder and urethra. Therefore, uroepithelial tumors of renal pelvis, ureter, bladder and urethra all have their commonality and may develop in multiple organs. Because urine stays in the bladder for the longest time, it also causes the most common bladder cancer. Urological tumors are often issued after the age of 40 and are about twice as common in men as in women. Besides men-specific tumors such as prostate cancer, testicular cancer, and penile cancer, bladder tumors are the most common tumors of the system. Testicular cancer mostly occurs in young men and people should check themselves once a month. Be alert if there is a significant difference in the size or weight of the testicles on both sides. If there is an ulcer or lump in the glans or foreskin, and antibiotic treatment does not work after 10 to 14 days, penile cancer should be suspected. Bladder cancer will have painless hematuria in early stage, which can be confirmed by ultrasound and cystoscopy. Liver cancer refers to malignant tumors occurring in the liver, including primary liver cancer and metastatic liver cancer, and most people refer to primary liver cancer in daily life. Primary liver cancer is one of the most common malignant tumors in clinical practice. According to the latest statistics, there are about 600,000 new liver cancer patients worldwide every year, ranking fifth among malignant tumors. Primary liver cancer can be divided into hepatocellular liver cancer, cholangiocellular liver cancer and mixed liver cancer according to cellular typing. According to the morphology of tumor, it can be divided into nodular type, giant type and diffuse type. Primary liver cancer is a high incidence in China, and generally more men than women. From hepatitis – cirrhosis – liver cancer, the “three steps of liver disease” has been a nightmare for men. China is a big country of hepatitis B. Most of the liver cancers in China develop on the basis of hepatitis B cirrhosis, and the number of hepatitis C patients is also increasing gradually, and hepatitis B can also develop into liver cancer afterwards. At present, the number of patients in China accounts for more than half of the global incidence and 55% of the global liver cancer patients, which has become a major killer that seriously threatens the health and lives of Chinese people and its danger should not be underestimated. Kidney cancer accounts for about 2%-3% of adult malignant tumors and 80%-90% of adult kidney malignant tumors. The incidence rate varies from country to country or region to region worldwide, generally speaking, the incidence rate in developed countries is higher than that in developing countries, urban areas is higher than that in rural areas, and there are more men than women, and the ratio of male to female patients is about 2:1. According to the National Cancer Prevention and Treatment Research Office and the Health Statistics Information Center of the Ministry of Health, the incidence and death of tumors in pilot cities and counties in China show that the incidence of kidney cancer in China is increasing year by year, and by 2008, it has become the 10th incidence of malignant tumors in men. The cause of kidney cancer is unknown, but the factors related to the development of kidney cancer are genetics, smoking, obesity, hypertension and anti-hypertensive treatment, etc. Oral cancer is a general term for malignant tumors occurring in the oral cavity, most of which belong to squamous epithelial cell carcinoma, which is the so-called mucosal metaplasia. In clinical practice, oral cancer includes gum cancer, tongue cancer, hard and soft palate cancer, jaw cancer, floor of mouth cancer, oropharyngeal cancer, salivary cancer, lip cancer, and maxillary sinus cancer, as well as cancers of the skin mucosa of the face. Oral cancer is one of the more common malignant tumors of the head and neck. Oral cancer is the most common cancer among young and middle-aged men, with an incidence rate 10 times higher than that of women. Smoking, drinking alcohol and eating betel nut are all causative factors. He reminded that if oral ulcers are found to be bad for 2 weeks, it is important to consult a doctor in time, which is the most important signal of oral cancer. Rectal cancer is the cancer between the dentate line and the junction of rectum and sigmoid colon, which is one of the most common malignant tumors in the gastrointestinal tract. The location of rectal cancer is low, and it is easily diagnosed by rectal diagnosis and sigmoidoscopy. However, because of its location deep into the pelvic cavity and complex anatomical relationship, surgery is not easy to be complete and the recurrence rate after surgery is high. The proximity of lower and middle rectal cancer to the anal sphincter makes it difficult to preserve the anus and its function during surgery, which is a difficult problem in surgery and is also the most debated disease in terms of surgical methods. The median age of rectal cancer incidence in China is around 45 years old. There is a trend of increasing incidence in young people. Men generally eat more fatty and protein-based foods than women, and scientific studies have shown that they are one of the major causes of rectal cancer. Therefore, it is important to have foods rich in fiber such as vegetables and fruits on the table regularly. Gastric cancer is 1.5 times-2.5 times more common in men than in women, especially in middle-aged men. The reason why stomach cancer is more “favored” by men is that they smoke and drink more, and it is also related to their lack of estrogen protection. On the one hand, we should prevent cancer from occurring in common stomach diseases. On the other hand, diet should not be too salty, less smoked food, quit smoking and limit alcohol, avoid eating too fast and eating hot and hard food.