This is an extended definition of infertility. The medical term for a miscarriage is an abortion.
Occupational hazards cause miscarriage.
Those women, who indulge in smoking, alcoholism, drug abuse experience miscarriages. Men exposed to environmental toxins can cause their partner to miscarry a fetus, because the toxin damages their sperm. Polycystic ovarian syndrome or PCOS is considered a cause of miscarriage. In PCOS, the ovaries produce a large amount of the LH hormone. In appropriate activation of the mother's immune system may cause miscarriages.