Fertility leads to pregnancy or successful fertilization leads to pregnancy. Whereas, infertility is when there results in no pregnancy, despite the mating pair trying to conceive for a period of 12 months, despite trying continuously.
There are many reasons to infertility – illnesses, weight of a person, drug abuse, lifestyle etc. Infertility in men and women are different and needs to be understood in detail. Thus, the treatments offered are also different.