What are the most common medical and lifestyle factors that contribute to infertility in both men and women, and how do these factors impact a couple’s ability to conceive? What are the different diagnostic methods used to identify the underlying causes of infertility, and what treatment options are available, such as medication, assisted reproductive technologies (ART), and lifestyle changes, to help couples achieve pregnancy? Additionally, how effective are these treatments, and what are the potential risks and success rates associated with each option?