Infertility can be present from birth (congenital) or can be acquired as you age.
Some of the causes may include:
Problems with ovulation: Certain conditions, like polycystic ovarian syndrome (ovaries secrete excessive amounts of male hormone testosterone) and hyperprolactinemia (produce high amounts of prolactin, a hormone that induces the production of breast milk), can prevent your ovaries from releasing eggs. Damaged fallopian tubes: Fallopian tubes carry the eggs from the ovaries to the uterus. Any damage to them can affect the fertilisation of the egg by the sperm. Pelvic surgeries and infections can cause formation of scar tissue that can damage your fallopian tubes.
Abnormalities of the cervix and uterus: Abnormal mucus production in the cervix, problems with the cervical opening, abnormal shape and presence of benign tumors in the uterus can all contribute to infertility. Premature menopause: Mostly caused by a condition known as primary ovarian insufficiency, premature menopause occurs when menstruation stops before the age of 40. The exact cause of this condition is unknown, though various treatments for cancer and abnormalities with the immune system have been known to contribute to it.
Adhesions: Bands of scar tissue can form in the pelvis after an infection or surgery. Other medical conditions: Diabetes, endometriosis, thyroid disorders, sickle cell disease or kidney diseases can affect the fertility of a woman.
Medications: Certain medications have been known to cause temporary infertility. Stoppage of those medications can restore fertility in most of the cases.
The chance of infertility increases with age. This increases if you smoke, consume excess alcohol, or are overweight, obese, or underweight.