Breast cancer: Breast cancer is the first malignant tumor among women, accounting for 23% of all malignant tumors suffered by women. It is one of the most important diseases that threaten women’s health. In China, the peak age of breast cancer incidence is around 45-50 years old, 5-10 years earlier than that of western countries. Although it cannot be detected before cancer and cannot be cured yet, early treatment can lead to long-term survival. Early detection mainly depends on women’s knowledge of breast cancer and frequent breast self-examinations, as well as annual ultrasound or mammogram. In addition, breast cancer is an estrogen-dependent tumor, so perimenopausal and postmenopausal women should not take estrogen supplements or health supplements blindly, but should do so under the guidance and monitoring of a doctor if necessary, especially if they have a family history of breast cancer. Cervical cancer: It is the second most common malignant tumor in women, and its incidence has increased sharply in recent years in China, and it is significantly younger, the youngest patient we treated is around 20 years old. Bleeding during sex is the most common symptom of cervical cancer or precancerous lesions, and should be seen immediately if it occurs. It is now well established that cervical cancer and precancerous lesions are infectious diseases and the cause is HPV infection. The absence of HPV infection can prevent cervical cancer. Vaccines for HPV are now available, just like the measles or BCG vaccinations we received as children, but they need to be used before age 16 when there is no history of sexual intercourse or no HPV (human papillomavirus) infection. In addition, HPV infection is usually transient and most clear on their own, taking an average of 8 months. CIN (cervical precancer) or cervical cancer usually occurs only with persistent HPV infection. It usually takes an average of 8-24 months after HPV infection to develop CINI-III (classified as mild, moderate, or severe) and then an average of 8-12 years for cervical cancer to develop. Therefore, in the United States, cervical cytology should be initiated for women with a sexual history of more than 3 years or older than 21 years of age, and once a year. For women older than 30 years of age cytology combined with high-risk HPV screening every 3 years can be applied instead of cytology screening every 1-2 years. There are also countries where only high-risk HPV screening for women with a history of sexual intercourse is considered to be better for cervical cancer screening as well. In conclusion, cervical cancer is a preventable, treatable and curable disease that can even be eradicated. It just requires us women to spend less money on a dress or a piece of jewelry and get a health screening every year! It can be detected and treated at the precancerous stage or early stage. Endometrial cancer: It is the third most common malignant tumor in women, and also estrogen-dependent tumor, the incidence of which has been gradually increasing in recent years, as it occurs mostly after menopause, and is considered to be a disease of older women, and those with the triad of obesity, hypertension and diabetes are the high-risk group. However, in recent years, there is a trend of younger age group, especially women with irregular menstruation (scanty menstruation), infertility and obesity are the high incidence group, and the youngest endometrial cancer patient we have treated is a 20-year-old girl. Women entering perimenopause (menopause) will have recurrent menstrual irregularities and scanty menstruation, which will easily lead to endometrial cancer. Those who have irregular menstruation, irregular vaginal bleeding or postmenopausal vaginal bleeding during perimenopause should go to the hospital in time for ultrasound examination to rule out endometrial cancer. In addition, women who have estrogen supplementation during perimenopause and postmenopause should be under the guidance of a doctor as in the case of breast cancer. Ovarian cancer: It is also a common malignant tumor in women, and although it has the fourth highest incidence rate, it has the highest mortality rate and is the most threatening tumor to women. There are no symptoms in the early stage and there is no method for early diagnosis, and 70% of patients are found to be in advanced stage. Therefore, the only way to prevent it is to have a gynecological examination and a pelvic ultrasound once a year, and early surgery should be performed for solid masses in the adnexal area and cystic masses reaching 5 cm or more. In addition, women with abdominal distension, loss of appetite and abdominal discomfort should have a pelvic ultrasound in addition to gastrointestinal examination, because many ovarian cancer patients show the above symptoms at an early stage.