Infertility in couples can occur due to several medical and lifestyle-related reasons, affecting both men and women equally. Common causes of infertility in couples include ovulation disorders, hormonal imbalance, blocked fallopian tubes, endometriosis, and PCOS in women. On the male side, male infertility causes such as low sperm count, poor sperm motility, abnormal sperm shape, and erectile dysfunction may reduce the chances of natural conception. Age is another important factor, as fertility declines with time in both partners. Unhealthy habits like stress, poor diet, smoking, alcohol consumption, and lack of physical activity can also impact reproductive health. In some cases, genetic conditions or chronic health issues play a role. Sometimes, even after detailed testing, no clear reason is found, known as unexplained infertility. Understanding the causes of infertility helps couples choose the right infertility treatment, seek timely care, and move forward with informed decisions