There are so many causes for infertility and some of them are also because of the medical intervention.
Women who are fertile may experience a natural period of fertility before and in the process of ovulation and they are infertile during the rest of the menstrual cycle. Many awareness methods for fertility are used in order to discern when these changes are occurring in females. Though, infertility is not only found in females.

Infertility can occur from male or female both. Around 20% of couples in USA are facing such problems as the present year report shows. Around 40% problems are from males as there sperm is not fertile to make the women pregnant. While, other 40% is because of women as there ovulation period is disturbed, tubal problems, endometriosis or they having other problems.

Some men have low sperm count which can be cause of infertility. A healthy sperm has about twenty million of semen in one millimeter of sperm. A man who produces sperm less than 5 million semen is reported to be infertile. A man, who can produce sperm semen between 5 to 20 million, is a sub-fertile. Some sperms have abnormal structures or their head/tail have unusual shape and they are unable to attract to ovum thus they are infertile as well. Testosterone is a good medication used for making sperm fertile but it is necessary to ask doctor for every medication or solution.

In women, ovulatory problems are much common and this means that they are unable to produce fertile eggs. Thyroid and pituiary glands can cause this problem as they release hormones that help regulate menstrual cycle. Women can check whether ovum is produced every month in order to make sure they are not facing ovulatory problems. Body temperature is high after sleep during ovulation.
Reasons for infertility are really varied and only doctor can help in this regard to tell you what’s your actual problem.