What is a molar pregnancy?

Instead of developing into a typical placenta and pregnancy, the pregnancy tissue has abnormal genetic material and can form swollen, fluid-filled structures. A complete molar pregnancy has no developing fetus. A partial molar pregnancy may include fetal tissue, but it cannot develop normally. These conditions belong to gestational trophoblastic disease, a group involving placental-type cells.

Bleeding, pelvic pressure, severe nausea or a uterus that seems larger than expected can occur, although symptoms vary. A scan and blood tests measuring human chorionic gonadotropin help clinicians assess what is happening. A molar pregnancy is not caused by something you did.

Arrange care with an obstetric or gynaecology team familiar with gestational trophoblastic disease. Treatment commonly removes the abnormal pregnancy tissue. The team then checks blood hCG at planned intervals until it falls as expected and remains clear. Follow the testing schedule even when bleeding and nausea improve, because the hormone trend helps show whether any active tissue remains.

Use reliable contraception for the period your team recommends so a new pregnancy does not make hCG results difficult to interpret. Emotional support can help after a pregnancy loss; ask about counselling if worry, grief or sleep problems persist.

Seek urgent medical help for heavy vaginal bleeding, faintness, severe or one-sided pelvic pain, chest pain, trouble breathing, persistent vomiting, or a severe headache with visual changes. These symptoms can signal significant blood loss, complications of pregnancy tissue, or another condition requiring prompt assessment. Contact your treating team quickly if a scheduled hCG test is missed or a result begins to rise.

Ask which type of molar pregnancy was found, how the diagnosis was confirmed, when the tissue will be removed, and who will review your hCG results. Clarify how often testing is needed, when contraception can stop, what symptoms should trigger a call, and whether further treatment such as chemotherapy is needed if the hormone level does not fall as expected.