Clinically reviewed by Dr. Ashlesha Patwardhan, Reproductive Health Doctor & Women's Health Researcher| Last reviewed: October 2025
When a miscarriage happens, one of the first questions people ask is: Why? The search for answers is natural — and painful when none are available. Unfortunately, myths and half-truths often cloud the reality.
What You’ll Find in This Guide
For deeper reading on specific aspects of causes and risk, see:
Different Types of Miscarriage and Pregnancy Loss — understanding the full spectrum
Can Stress or Exercise Cause a Miscarriage? — the evidence
Miscarriage in Context
A miscarriage is the loss of a pregnancy before 20 weeks (or 24 weeks according to UK guidelines). It’s more common than most people realize: around 1 in 4 clinically recognized pregnancies ends this way, with the vast majority happening in the first trimester.
In around 50% of early miscarriages, chromosomal abnormalities prevent normal embryonic development.
Common Myths vs. Facts
Myth | Fact |
|---|---|
“Stress, exercise, or sex caused it.” | Everyday activities, including moderate exercise or sex, do not cause miscarriage. |
“If I had eaten differently, I could have prevented this.” | No strong evidence that routine diet causes miscarriage, though severe deficiencies or certain infections may increase risk. |
“One miscarriage means I’ll keep miscarrying.” | Most people have a successful subsequent pregnancy; only ~1% experience recurrent miscarriage. |
“There must be something wrong with me.” | Miscarriage is most often linked to chromosomal issues in the embryo — not a problem with you. |
What About Recurrent Miscarriage?
About 1 in 100 women experience recurrent miscarriage, defined as the loss of two or more pregnancies.
Around half of cases have identifiable causes including antiphospholipid syndrome, uterine anomalies, thyroid dysfunction, and parental chromosomal arrangements.
In the other half, the cause remains unexplained, which can feel deeply frustrating for families seeking answers.
Organizations like Tommy’s in the UK are at the forefront of research, aiming to better understand recurrent miscarriage and improve both prevention and treatment.
What Testing Can and Can’t Tell You
After one miscarriage, doctors typically don’t investigate further — because in most cases, the cause was a one-off chromosomal event. After two or more consecutive losses, a recurrent miscarriage workup may be recommended. This can include blood tests, genetic testing, and imaging to look at uterine structure.
But investigations don’t always provide answers. In roughly half of recurrent miscarriage cases, no clear cause is found — and sitting with that uncertainty is its own kind of grief. For a full overview of what testing involves, read How Do Doctors Test for the Cause of a Miscarriage? and How Are Recurrent Miscarriages Diagnosed and Treated?.
Understanding the Different Types of Loss
Miscarriage is not one single experience. A missed miscarriage (discovered on a scan with no symptoms), a chemical pregnancy, an incomplete miscarriage, and a late loss all have different medical profiles — and different emotional realities.
For a full overview of all types, read Different Types of Miscarriage and Pregnancy Loss. If you’ve had a missed miscarriage specifically, What Is a Missed Miscarriage and How Is It Diagnosed? goes into more detail on that experience.
The Emotional Truth About “Why”
Even when science says “it wasn’t your fault,” the mind goes searching. Many people replay every meal, workout, or stressful moment — wondering if it contributed. Can Stress or Exercise Cause a Miscarriage? addresses this directly, and the answer is clear: no. Everyday stress and moderate exercise are not causes of miscarriage.
But knowing that intellectually doesn’t always stop the guilt from surfacing. If self-blame is part of what you’re carrying, the emotional recovery resources in our Coping With Miscarriage Grief: What Helps guide can help.
Key Takeaways
Most miscarriages are caused by random chromosomal issues, not something you could have prevented.
Recurrent miscarriage (two or more losses) affects 1 in 100 women; about half of cases have identifiable causes.
Research organizations like Tommy’s are working to uncover answers for families who’ve been left in the dark.
Grief and self-blame are common, but miscarriage is not your fault.
Testing after one miscarriage is not usually recommended; after two or more losses, a workup can help identify treatable causes.
Not all investigations return a clear answer — and that uncertainty is genuinely difficult.
If self-blame is part of your grief, you’re not alone — and it’s not your fault.
Searching for answers after a miscarriage can be exhausting. Sibyl is a private, confidential space to process the questions — including the ones that don’t have answers. Try Sibyl
