Complete moles, also known as molar pregnancies, are a type of gestational trophoblastic disease where abnormal tissue grows inside the uterus instead of a normal embryo. This condition occurs when an egg is fertilized by a sperm, but instead of developing into a fetus, the tissue forms a mass of cysts. Complete moles contain no fetal tissue and are characterized by an overproduction of placental tissue. Women with complete moles may experience symptoms such as abnormal vaginal bleeding, rapid uterine growth, and elevated levels of human chorionic gonadotropin (hCG) in their blood. Diagnosis typically involves ultrasound imaging and blood tests. Treatment usually requires a procedure to remove the abnormal tissue to prevent complications.