Complete hydatidiform mole is a type of hydatiform mole characterized by abnormal hyperplastic trophoblasts and hydropic villi due to fertilization of an enucleated ovocyte by one or two haploid spermatozoa that can manifest with vaginal bleeding accompanied by nausea and frequent vomiting, hyperemesis gravidarum, risk of spontaneous miscarriage, hyperthyroidism, and has the potential of developing into choriocarcinoma. The disease is complete hydatidiform mole (Monarch Disease Ontology entry MONDO_0016785). Also known as: classical hydatidiform Mole, complete Mole, complete hydatid Mole, complete molar pregnancy.