Some factors can affect how easily a woman ovulates, gets pregnant, or delivers a child. These include:
Age. Women in their late 30s and older are generally less fertile than women in their early 20s.
Chronic diseases such as diabetes, lupus, arthritis, hypertension, and asthma
Environmental factors. These include cigarette smoking, drinking alcohol, and exposure to workplace hazards or toxins.
Too much body fat or very low body fat
Abnormal Pap smears that have been treated with cryosurgery or cone biopsy
DES taken by mother during pregnancy
Sexually transmitted diseases
Fallopian tube disease
Abnormalities in the uterus that are present at birth or happen later in life
Infertility is not just a woman's problem. Here is a list of things that can affect a man's fertility:
History of prostatitis, genital infection, or sexually transmitted diseases
Exposure to hazards on the job or to toxic substances. These include radiation, radioactivity, welding, and many chemicals. Toxic chemicals include lead, ethylene dibromine, and vinyl chloride.
Cigarette or marijuana smoke
Heavy alcohol drinking
Exposure of the genitals to high temperatures
Prescription medicine. These include opioid-like medicines that affect the central nervous system. An example is medicines to treat mental illness.
Mumps after puberty
A genetic problem or a problem that was present at birth (congenital)