1. Physiological reasons 1.1 Abnormal ovarian function Abnormal ovarian function is one of the main reasons for infertility. If the ovaries cannot discharge eggs normally, or the eggs discharged are of poor quality, pregnancy will be affected. 1.2 Problems Endometriosis, fibroids and other problems can affect pregnancy. These problems may cause difficulty in embryo implantation or miscarriage. 2. Reasons for physical health 2.1 Malnutrition The body lacks necessary nutrients, such as vitamins, protein, etc., which will affect pregnancy. It is recommended to eat more nutritious foods on a daily basis. 2.2 Diseases Suffering from certain diseases may also affect pregnancy. Such as hyperthyroidism, diabetes, etc.