What Causes Miscarriage? Separating Myths from Medical Facts
For many couples, the moment they see two pink lines on a pregnancy test marks the beginning of countless dreams and plans for the future. When that pregnancy ends unexpectedly, it brings not only grief but also an overwhelming sense of guilt.
One of the first questions parents ask is, "Did we do something wrong?"
As obstetricians, we've had this conversation with many couples. Some worry that climbing stairs caused the miscarriage. Others believe travelling, exercising, eating certain foods, or even a stressful week at work was responsible.
The truth is that most miscarriages happen because of reasons that are completely beyond a couple's control.
Understanding what really causes a miscarriage—and what doesn't—can help replace fear with facts and support couples as they plan their next steps.
What Is a Miscarriage?
A miscarriage is the spontaneous loss of a pregnancy before 20 weeks of gestation, with most occurring during the first trimester, especially within the first 12 weeks.
It is more common than many people realise. Studies suggest that 10–20% of known pregnancies end in miscarriage, and the actual number may be higher because some losses happen before a woman even knows she is pregnant.
Experiencing a miscarriage can be emotionally and physically challenging, but in most cases, it does not mean that a woman cannot have a healthy pregnancy in the future.
What Is the Most Common Cause of Miscarriage?
The most common cause of miscarriage during the first trimester is chromosomal abnormalities in the developing baby.
Simply put, the embryo may not develop as expected because of changes in its chromosomes. When this happens, the pregnancy cannot continue normally.
This is nature's way of preventing a pregnancy that would not have developed into a healthy baby.
Importantly, these chromosomal changes are usually random. They are not caused by something the mother or father did or did not do.
Other Medical Causes of Miscarriage
While chromosomal abnormalities account for many early pregnancy losses, other factors may also increase the risk.
These include:
Hormonal disorders
Conditions such as uncontrolled thyroid disease or poorly managed diabetes can affect pregnancy if left untreated.
Uterine abnormalities
Some women are born with structural differences in the uterus, while others may develop fibroids or scar tissue that interfere with pregnancy.
Cervical insufficiency
A weak cervix may open too early during the second trimester, increasing the risk of pregnancy loss.
Autoimmune conditions
Certain autoimmune disorders, such as antiphospholipid syndrome, can affect blood flow to the placenta and increase the risk of miscarriage.
Severe infections
Although uncommon, some infections during pregnancy may contribute to pregnancy loss and require prompt medical attention.
Increasing maternal age
The likelihood of chromosomal abnormalities rises with age, particularly after 35 years, making miscarriage more common.
Common Miscarriage Myths—And the Facts
One of the biggest challenges we see is the number of misconceptions surrounding miscarriage. Let's look at some of the most common myths.
Myth: Stress causes miscarriage.
Fact: Everyday stress, work pressure, or emotional upset does not usually cause miscarriage. While severe physical trauma or significant illness can affect pregnancy, routine life stress is not considered a direct cause of early pregnancy loss.
Myth: Climbing stairs can cause miscarriage.
Fact: No. Climbing stairs, walking around the house, or performing normal daily activities does not cause miscarriage in a healthy pregnancy.
Myth: Exercise during pregnancy is dangerous.
Fact: In uncomplicated pregnancies, moderate exercise recommended by your obstetrician is generally safe and offers several health benefits for both mother and baby.
Myth: Travelling leads to miscarriage.
Fact: Most women with low-risk pregnancies can travel safely. However, those with bleeding, severe pain, or high-risk pregnancies should follow their doctor's advice before planning a trip.
Myth: One miscarriage means you won't be able to conceive again.
Fact: This is one of the most reassuring facts we share with couples. Most women who experience one miscarriage go on to have healthy pregnancies in the future.
Can Miscarriage Be Prevented?
Not every miscarriage can be prevented, especially those caused by chromosomal abnormalities.
However, couples can improve the chances of a healthy pregnancy by:
- Planning a preconception health check-up
- Taking folic acid before conception
- Managing diabetes and thyroid disorders
- Maintaining a healthy weight
- Avoiding smoking, alcohol, and recreational drugs
- Attending regular antenatal appointments
- Following medical advice throughout pregnancy
Good prenatal care allows potential concerns to be identified and managed early.
When Should You Seek Immediate Medical Attention?
While not every episode of bleeding results in miscarriage, certain symptoms should never be ignored.
Contact your obstetrician or visit the hospital immediately if you experience:
- Vaginal bleeding during pregnancy
- Severe abdominal cramps
- Persistent lower back pain
- Passing clots or tissue
- Leakage of fluid
- Fever with chills
- Dizziness or fainting
Early medical assessment is essential to determine the cause and provide the right care.
What Happens After a Miscarriage?
The emotional impact of miscarriage is often underestimated.
Many couples experience grief, disappointment, anxiety, or even guilt. These feelings are completely understandable.
It's important to remember that a miscarriage is rarely anyone's fault.
Your doctor may recommend investigations after recurrent miscarriages or if there are specific medical concerns. In many cases, no extensive testing is required after a single early miscarriage.
Taking time to heal—both physically and emotionally—is an important part of recovery.
Looking Ahead with Hope
A miscarriage can leave couples with many unanswered questions, but it does not define future pregnancies.
With the right medical evaluation, emotional support, and expert guidance, most couples go on to experience healthy pregnancies and healthy babies.
If you've experienced a miscarriage or are planning another pregnancy, don't hesitate to discuss your concerns with your obstetrician. Understanding the cause, when possible, and preparing for a future pregnancy can provide reassurance and confidence during your journey.
Compassionate Pregnancy Care at Ankura Hospital
At Ankura Hospital for Women & Children, we understand that pregnancy loss is not just a medical event—it is a deeply personal experience. Our team of experienced obstetricians provides compassionate care, thorough evaluation, and personalised guidance for couples experiencing miscarriage or recurrent pregnancy loss.
From preconception counselling to high-risk pregnancy care, we are committed to supporting families at every step of their journey with evidence-based treatment and emotional care.