Читать книгу Need to Know Fertility, Conception and Pregnancy - Harriet Sharkey - Страница 109

• In a third of cases, there is a problem with sperm quantity or quality.

• In around a quarter of cases, there may be a problem in producing eggs.

• In a fifth of cases, problems with the fallopian tubes prevent transport of the eggs to the womb.

Furthermore, it is not uncommon for more than one factor to be present and in almost 1:5 couples, both partners contribute to the problem. However, in about a quarter of cases, no cause can be found in either partner. This is called unexplained infertility. In addition, the problem can be something that you might not consider to be a medical issue, like being underweight or overweight, experiencing rapid weight loss or smoking.