Spontaneous Abortion: This is the most common cause of miscarriage and bleeding in early pregnancy, often due to chromosomal abnormalities, hormonal issues, or other factors affecting fetal development.

Ectopic Pregnancy: Although less common than spontaneous abortion, ectopic pregnancy can cause miscarriage and bleeding due to implantation of the embryo outside the uterus, often in the fallopian tube.
Molar Pregnancy: A rare form of pregnancy characterized by abnormal growth of trophoblasts, the cells that normally develop into the placenta, which can lead to miscarriage and bleeding.
Threatened Abortion: Vaginal bleeding during the first 20 weeks of pregnancy without cervical dilation, which may or may not lead to miscarriage.

Placenta Previa: A condition where the placenta covers the cervix, which can cause severe bleeding during pregnancy and is life-threatening if not promptly diagnosed and managed.
Placental Abruption: Premature separation of the placenta from the uterus, which can cause bleeding and deprive the fetus of oxygen and nutrients, leading to severe complications or death if not immediately addressed.
Uterine Rupture: A rare but life-threatening condition where the uterus tears, often in women with a previous uterine scar, which requires emergency surgical intervention.

Choriocarcinoma: A rare type of cancer that occurs in the uterus, often following a molar pregnancy, miscarriage, or ectopic pregnancy, which can cause bleeding and requires prompt treatment.
Metastatic Disease to the Uterus: Rarely, cancers from other parts of the body can metastasize to the uterus, potentially causing bleeding and other symptoms mimicking miscarriage.