What are the causes of infertility?

The causes of infertility are complex and diverse, mainly including the following aspects: 1. Age factor: Fertility declines with age, and older couples are more likely to experience infertility issues. 2. Unhealthy lifestyle: Unhealthy habits such as smoking, excessive alcohol consumption, drug abuse, and long-term late-night activities can negatively affect fertility. 3. Male factors: Poor sperm quality, sexual dysfunction, blocked vas deferens, and other male factors can all potentially lead to infertility. 4. Female factors: Female reproductive system disorders such as ovarian dysfunction, fallopian tube blockage, and abnormal uterine development can contribute to infertility. 5. Other factors: Immune factors, genetic factors, chromosomal abnormalities, and others may also cause infertility. The specific cause must be determined through professional examinations tailored to the individual's circumstances.