It is one of the most common causes of infertility. It leads to the development of scar tissue which in turn can prevent the ovaries, uterus and fallopian tubes from functioning (which is essential for implantation and fertilization to occur). Premature ovarian failure Known as early menopause. It is usually due to smoking, medications, and cancer treatments. she stops producing eggs many years earlier than normal (around age 50). Male Sperm Problems Low sperm production can result from low testosterone. Poor quality sperm can result from drugs, alcohol abuse and poor nutrition. If sperm are limited, the chances of them successfully fertilizing an egg decrease. If the sperm is not fully developed, it would be difficult for its tail to reach the egg. Couple's infertility/unidentified infertility Combined infertility could be due to overweight and insufficient physical activity Higher risks of having sexual intercourse