Placenta previa is a condition where placenta is found covering the cervix completely or partially. TYPES: Type 1: Low-lying placenta previa Type 2: Marginal placenta previa Type 3: Incomplete or partial central placenta previa Type 4: Central or complete placenta previa Risk factors are: Age > 35 years Cocaine Smoking Previous placenta previa Previous C-section Picture credits: https://www.thesciencenotes.com/placenta-previa-theories-typesco-plications-management-and-treatment/