Recurrent pregnancy loss is defined as three or more consecutive pregnancy losses before 20 weeks of gestation. The document discusses the types, causes, risk factors, diagnosis, and management of recurrent pregnancy loss. It notes that chromosomal abnormalities account for 30-57% of recurrent losses. Thrombophilias and autoimmune factors like antiphospholipid syndrome may also play a role. Evaluation includes testing for genetic and anatomical abnormalities, as well as endocrine, immune, and coagulation disorders. Progesterone supplementation and low-dose aspirin are beneficial for some cases of unexplained recurrent pregnancy loss.