According to studies, infertility due to inability to ovulate is much more common in obese women than in ordinary women. Moreover, in case of abdominal obesity, the likelihood of infertility increases. One study found that for every 0.1 increase in the waist/hip ratio, the chance of conception decreases by 30%. In addition to the waist/hip ratio affecting conception, another important factor that can affect conception is polycystic ovary syndrome (PCOS), which is almost a roadblock to conception. According to research, obesity-related factors account for about 70% of non-organic infertility in women, and polycystic ovary syndrome is the most common in obese women, which is characterized by irregular menstruation, hirsutism, acanthosis nigricans, and infertility after marriage. And some data show that the infertility rate of obese women is as high as 76%. Polycystic ovary syndrome tends to cause irregular menstrual cycles and infertility, and most obese women have polycystic ovary syndrome, so if you want to conceive successfully, you need to lose weight first! Weight loss surgery will improve fertility. A group of data showed that weight loss surgery significantly improved the manifestations of PCOS such as irregular menstruation, hirsutism and infertility. The incidence of PCOS decreased by 40%. In obese patients with PCOS, menstrual irregularities improved after weight loss surgery, while androgens decreased, sex hormone binding globulin increased, luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels increased, and ovulation function improved. Studies have shown that patients with PCOS have higher pregnancy rates and lower miscarriage rates after weight loss surgery. 69 of 110 infertile obese patients became pregnant after surgery, and a decrease in BMI after surgery5 predicted an increased chance of pregnancy within the next 2.5 years. After the weight loss surgery in 2016, her menstrual period was normal 3 months after the surgery and her polycystic ovary syndrome was cured, and she got pregnant 4 months after the surgery.