Why does a missed miscarriage happen?

A missed miscarriage usually happens because a pregnancy stops developing, often for reasons that cannot be identified or prevented. It is not caused by ordinary activity, emotions, or a mistake you made. The diagnosis is confirmed through clinical assessment and ultrasound rather than symptoms alone.

Early development depends on coordinated growth of the embryo, placenta, and supporting tissues. When development stops, the body may not immediately begin passing the pregnancy tissue, so bleeding can be absent. Clinicians review the pregnancy dates and scan findings, and may recommend repeat assessment when more information is needed.

Sometimes a clinician cannot identify a specific reason. That uncertainty can be difficult, but it does not mean you caused the loss or that a future pregnancy will follow the same course.

After confirmation, discuss waiting for natural passage, medication, or a procedure. Your choice may depend on your symptoms, medical history, access to follow-up, and personal preferences. Read about [Medical Management of Miscarriage](/treatments/medical-gynaecology/medical-management-of-miscarriage/) and [Surgical Management of Miscarriage](/treatments/gynaecological-surgery/surgical-management-of-miscarriage/) before deciding with your care team.

Get urgent medical help for heavy bleeding, severe abdominal pain, fainting, pronounced dizziness, fever, or feeling very unwell. Seek advice for worsening symptoms after treatment or discharge with an unpleasant smell.

Ask whether the diagnosis is confirmed, whether repeat imaging is needed, and whether any medical history changes your care. You can also ask about follow-up, emotional support, and when it is appropriate to discuss another pregnancy.