Infertility is divided into primary infertility and secondary infertility. Primary infertility refers to never having been pregnant before, which is called primary infertility. Secondary infertility generally occurs in individuals who have had children or a history of miscarriage and have been unable to conceive again after trying for a year, thus constituting secondary infertility. It is essential for those with secondary infertility to undergo relevant fertility tests at a hospital. Typically, the clinical evaluation includes a semen analysis for the male partner, and for the female partner, tests such as Mycoplasma and Chlamydia detection, endocrine examinations, immunological tests, and assessments for fallopian tube patency and related endocrine tests. Generally, through these tests, the cause of secondary infertility can be identified, and treatment can be tailored based on the results. In cases of secondary infertility, the vast majority can achieve conception through targeted treatment.