In females, the reasons or causes could be
Ovulation disorder, or ovulating infrequently, due to
- Polycystic ovary syndrome (PCOS). PCOS causes a hormone imbalance, which affects ovulation.
- Hypothalamic dysfunction.
- Premature ovarian failure. Also called primary ovarian insufficiency, this disorder is usually caused by an autoimmune response or by premature loss of eggs from your ovary (possibly from genetics or chemotherapy).
- Too much prolactin. The pituitary gland may cause excess production of prolactin (hyperprolactinemia), which reduces estrogen production and may cause infertility.
Damage to fallopian tubes (tubal infertility), due to
- Pelvic inflammatory disease, an infection of the uterus and fallopian tubes
- Previous surgery in the abdomen or pelvis
- Pelvic tuberculosis
Endometriosis - Endometriosis occurs when tissue that normally grows in the uterus implants and grows in other locations. This extra tissue growth — and the surgical removal of it — can cause scarring, which may block fallopian tubes and keep an egg and sperm from uniting.
Uterine or cervical causes - Thankfully, with the advancement of medical sciences there is a cure for Infertility, and people are opting for such treatments across the globe.