There are two types of infertility:
Primary infertility – occurs when someone who has never conceived a child has difficulty conceiving.
Secondary infertility is where a woman has had one or more pregnancies but is having difficulty conceiving again.
There are many potential causes of infertility, and fertility problems can affect either the man or the woman. However, it is not always possible to identify the cause.
Common causes of infertility in women include lack of regular ovulation (the monthly release of an egg), blockage of the fallopian tubes and endometriosis; although in quite a few cases the cause is unexplained. In men, the most common cause is poor quality of semen (the fluid containing sperm that is ejaculated during intercourse).
For some people, leading a healthy lifestyle and having regular health checks and tests may help to prevent infertility.