The most common cause of recurrent pregnancy loss is chromosomal abnormalities in the fetus. Other causes include uterine abnormalities, autoimmune disorders, hormonal imbalances, and infections.

Chromosomal abnormalities account for 50 to 60 percent of recurrent pregnancy losses. These abnormalities can occur due to either an abnormal number of chromosomes or structural changes in the chromosomes. Chromosomal abnormalities are often caused by errors during cell division in the early stages of embryo development

Hormonal imbalances, such as those caused by polycystic ovary syndrome (PCOS), can also lead to recurrent pregnancy loss. PCOS is a condition in which the body produces too much of the hormone androgen, which can interfere with ovulation and implantation. Infections, such as bacterial vaginosis, can also cause recurrent pregnancy loss.

Bacterial vaginosis is an imbalance of the normal bacteria that normally inhabit the vagina, which can lead to inflammation and an increased risk of