Miscarriage

Miscarriage is the loss of a pregnancy before 20 weeks. It is common, often emotionally devastating, and medically important for both partners to understand. While miscarriage happens in the pregnant partner’s body, it can be influenced by many factors, including embryo chromosome problems, maternal health conditions, age, and in some cases male fertility factors such as sperm DNA damage. For anyone trying to conceive, understanding miscarriage can help with next steps, testing, recovery, and future pregnancy planning.

What Is Miscarriage?
Key Takeaways
Why Miscarriage Matters
Types of Miscarriage
Symptoms and Signs
Causes and Risk Factors
Miscarriage and Men's Health or Fertility
Diagnosis and Testing
What's Normal vs What's Not?
Treatment and Management
Trying to Conceive Again After Miscarriage
Can Miscarriage Be Prevented?
Common Myths and Misconceptions
Questions to Ask Your Doctor
Related Tests and Terms
Frequently Asked Questions
References

What Is Miscarriage?

Miscarriage, also called spontaneous abortion in medical terminology, means a pregnancy ends on its own before 20 weeks. Most miscarriages happen in the first trimester, especially before 12 weeks. According to the American College of Obstetricians and Gynecologists (ACOG) guidance on early pregnancy loss, miscarriage is the most common type of pregnancy loss.

In many cases, miscarriage happens because the embryo is not developing normally, often due to chromosome abnormalities that occur by chance. That means many losses are not caused by something the pregnant person did or did not do. At the same time, recurrent miscarriage, later pregnancy loss, or repeated failed conception can sometimes point to an underlying medical issue that deserves evaluation.

For men and couples, miscarriage is not only a women’s health topic. It is also a fertility topic. Sperm quality, paternal age, and sperm DNA integrity may influence embryo development and miscarriage risk in some couples, as discussed in research indexed by PubMed on paternal factors and recurrent pregnancy loss.

Key Takeaways

Miscarriage is the loss of a pregnancy before 20 weeks, most often in the first trimester.
The most common cause is a chromosome problem in the embryo, usually occurring by chance.
Common symptoms include vaginal bleeding, cramping, and passing tissue, but some miscarriages are found only on ultrasound.
One miscarriage is common and usually does not mean future infertility.
Repeated miscarriages may warrant testing for hormone, uterine, genetic, immune, or clotting-related issues.
Male factors can matter, especially sperm DNA fragmentation, lifestyle risks, and older paternal age.
Treatment may involve expectant management, medication, or a procedure depending on the situation.
Anyone with heavy bleeding, severe pain, dizziness, fever, or signs of ectopic pregnancy needs urgent medical care.

Why Miscarriage Matters

Miscarriage matters for several reasons. First, it is common. The U.S. National Library of Medicine via MedlinePlus notes that many pregnancies end in miscarriage, often before a person even realizes they are pregnant. Second, it can carry emotional effects that are often underestimated, including grief, anxiety, depression, guilt, relationship stress, and fear during future pregnancies.

It also matters because the meaning of a miscarriage depends on context:

After one miscarriage: future pregnancy chances are still often good.
After two or more miscarriages: doctors may consider evaluation for recurrent pregnancy loss.
When pregnancy tests stay positive but ultrasound findings are unclear: careful follow-up is needed.
When there is pain on one side, fainting, or shoulder pain: ectopic pregnancy must be ruled out urgently.

For couples trying to conceive, miscarriage can overlap with infertility workups, semen analysis, ovulation tracking, hormone evaluation, and reproductive endocrinology care.

Types of Miscarriage

Miscarriage is an umbrella term. Clinicians often use more specific terms based on symptoms, ultrasound, and whether pregnancy tissue has passed.

Common types

Threatened miscarriage: bleeding occurs, but the cervix remains closed and the pregnancy may still continue.
Inevitable miscarriage: bleeding and cramping occur with cervical opening, suggesting loss is in progress.
Incomplete miscarriage: some pregnancy tissue has passed, but some remains in the uterus.
Complete miscarriage: all pregnancy tissue has passed.
Missed miscarriage: the embryo or fetus has stopped developing, but the tissue has not yet passed and symptoms may be minimal.
Blighted ovum or anembryonic pregnancy: a gestational sac develops, but an embryo does not develop normally.
Septic miscarriage: a miscarriage complicated by uterine infection; this is a medical emergency.
Recurrent pregnancy loss: usually defined as two or more failed clinical pregnancies, though definitions vary by organization. See the American Society for Reproductive Medicine (ASRM) committee opinion.

Miscarriage vs stillbirth

The term miscarriage generally applies to pregnancy loss before 20 weeks. Loss after 20 weeks is more often referred to as stillbirth, though specific terminology can vary by country and institution.

Symptoms and Signs

The most common miscarriage symptoms are vaginal bleeding and lower abdominal cramping. But symptoms vary widely. Some people have spotting and continue to have a healthy pregnancy. Others have no obvious symptoms and learn about a loss during an ultrasound.

Possible signs of miscarriage

Vaginal spotting or bleeding
Cramping or pelvic pain
Passing clots or tissue
Low back pain
Sudden loss of pregnancy symptoms, such as nausea or breast tenderness, though this alone is not diagnostic

Emergency warning signs

Seek urgent medical care for any of the following:

Heavy bleeding, especially soaking pads quickly
Severe or one-sided pelvic pain
Fainting, lightheadedness, or weakness
Fever or chills
Foul-smelling discharge
Shoulder pain or signs of ectopic pregnancy

The NHS miscarriage guidance and Mayo Clinic miscarriage overview both emphasize that bleeding in early pregnancy always deserves medical attention, even though not all bleeding means miscarriage.

Causes and Risk Factors

The biggest misconception about miscarriage is that it usually happens because of stress, exercise, sex, or one wrong meal. In reality, most early miscarriages are caused by chromosomal abnormalities in the embryo that make normal development impossible. ACOG notes this is the most common cause of early pregnancy loss.

Common causes or contributors

Embryo chromosome abnormalities: often random and not preventable.
Maternal age: miscarriage risk rises with age, especially after the mid-30s. ACOG and ASRM both recognize age as a major factor.
Uterine issues: fibroids that distort the cavity, uterine septum, adhesions, or structural abnormalities.
Hormonal or endocrine conditions: thyroid disease, uncontrolled diabetes, and sometimes luteal phase issues.
Antiphospholipid syndrome: an autoimmune clotting disorder linked to recurrent pregnancy loss.
Genetic rearrangements in a parent: such as balanced translocations.
Infections: some infections can cause pregnancy loss, although routine minor illnesses do not usually.
Environmental or lifestyle exposures: smoking, heavy alcohol use, certain toxins, illicit drugs, and high heat exposures may contribute.
Obesity: associated with a higher risk of miscarriage in some studies.

Risk factor summary

Advanced maternal age
Prior miscarriage
Certain chronic diseases
Smoking
Heavy alcohol use
Uncontrolled endocrine disease
Uterine abnormalities
Some fertility-related male factors

Causes that are often overblamed

Routine exercise, sex, work, or emotional stress are not usually the cause of miscarriage. As the ACOG FAQ on early pregnancy loss explains, everyday activities rarely cause pregnancy loss.

Miscarriage and Men's Health or Fertility

This is where many glossary pages stop short. Miscarriage is often discussed only in terms of female reproductive health, but male fertility can also play a role in reproductive outcomes.

How the male partner may matter

Sperm DNA fragmentation: Higher sperm DNA damage has been associated in some studies with miscarriage risk and recurrent pregnancy loss. See systematic review and meta-analysis on sperm DNA fragmentation and recurrent pregnancy loss.
Paternal age: Older paternal age may contribute to reduced embryo quality and higher miscarriage risk in some datasets.
Lifestyle factors: Smoking, heavy alcohol use, obesity, poor diet, chronic heat exposure, anabolic steroid use, and some occupational toxins may affect sperm quality.
Varicocele: In some men, varicocele is linked with increased oxidative stress and poorer sperm quality.
Medical conditions: fever, poorly controlled diabetes, and some medications can temporarily worsen sperm parameters.

What this means in practice

If a couple has experienced recurrent miscarriage, it can be reasonable to assess the male partner as part of the workup, especially when there is known male factor infertility, abnormal semen parameters, advanced paternal age, or repeated unexplained losses. This may include:

Detailed reproductive and medical history
Semen analysis
Consideration of sperm DNA fragmentation testing in selected cases
Lifestyle review
Evaluation for varicocele or endocrine issues when indicated

Male factors are usually one part of a bigger picture. They do not explain every miscarriage, and an abnormal sperm test does not prove causation. But in fertility medicine, they are increasingly recognized as clinically relevant.

Diagnosis and Testing

Doctors diagnose miscarriage using a combination of symptoms, exam findings, pregnancy hormone levels, and ultrasound.

Common tests used

Transvaginal ultrasound: the most important imaging test in early pregnancy assessment.
Blood hCG testing: repeated human chorionic gonadotropin levels may help clarify whether a pregnancy is developing as expected.
Pelvic exam: to assess bleeding and whether the cervix is open.
Blood type and Rh status: to determine whether Rh immune globulin may be needed.
Tissue testing: sometimes products of conception are analyzed after recurrent losses or procedures.

If miscarriages happen more than once

For recurrent pregnancy loss, evaluation may include:

Parental karyotyping in selected cases
Uterine imaging such as saline sonogram, hysteroscopy, or HSG
Thyroid testing
Diabetes screening
Antiphospholipid antibody testing
Other testing based on clinical history

ASRM provides a widely used framework for this in its committee opinion on recurrent pregnancy loss.

Testing table

Below is a simple overview of what different tests can help show.

Test overview

Ultrasound: checks pregnancy location, gestational sac, embryo, heartbeat, and retained tissue.
Serial hCG: helps assess whether pregnancy hormone levels are rising or falling appropriately.
Blood type and Rh: identifies whether Rh immune globulin may be needed.
Uterine imaging: looks for fibroids, septum, adhesions, or other cavity abnormalities.
Genetic testing: may identify chromosome abnormalities in pregnancy tissue or parents.
Semen analysis: evaluates sperm count, motility, morphology, and overall male factor fertility.
Sperm DNA fragmentation: sometimes considered in recurrent pregnancy loss or unexplained infertility.

What's Normal vs What's Not?

There is no single “normal range” for miscarriage itself, but there are patterns that help interpret what may or may not be concerning.

Early pregnancy findings: reassuring vs concerning

Often can be normal
Light spotting in early pregnancy
Mild cramping without heavy bleeding
Slow change in symptoms like nausea from day to day

Needs prompt evaluation
Heavy bleeding
Strong pelvic cramping
Passing clots or tissue
One-sided pain
Dizziness or fainting
Fever or foul discharge

One miscarriage vs recurrent miscarriage

Situation comparison

One miscarriage: common, often due to random chromosome issues, and many couples go on to have a healthy pregnancy.
Two or more miscarriages: may justify a more detailed evaluation depending on age, timing, and history.
Three or more miscarriages: strongly warrants a formal recurrent pregnancy loss workup if not already done.

Definitions vary somewhat by guideline, but clinicians take repeated pregnancy loss seriously even if many cases still end up unexplained.

Treatment and Management

Treatment depends on the type of miscarriage, how far along the pregnancy is, symptoms, ultrasound findings, infection risk, and patient preference.

Main treatment options

Expectant management
Waiting for the body to pass pregnancy tissue naturally. This may be appropriate when the person is stable and prefers to avoid medication or surgery.
Medication management
Drugs such as misoprostol, sometimes combined with mifepristone, may help the uterus expel tissue. ACOG and other organizations describe evidence-based protocols for this approach.
Procedure
Uterine aspiration or dilation and curettage may be recommended if there is heavy bleeding, infection, retained tissue, patient preference, or unsuccessful expectant or medication management.

Supportive care

Pain control
Follow-up ultrasound or hCG when needed
Rh immune globulin for Rh-negative patients when indicated
Emotional support and counseling
Guidance on when sex, tampons, or exercise can be resumed

When urgent treatment is needed

Suspected ectopic pregnancy
Very heavy bleeding
Signs of infection
Hemodynamic instability

The ACOG patient guidance and NHS treatment overview are useful patient-facing summaries of these options.

Trying to Conceive Again After Miscarriage

One of the most common questions after a miscarriage is: when can we try again? The answer depends on medical recovery, emotional readiness, and whether further evaluation is needed.

General points

Ovulation can return fairly quickly after an early miscarriage.
Many couples can try again once bleeding has stopped, infection is excluded, and they feel ready.
If there have been repeated losses, it may make sense to finish a workup before trying again.
Preconception optimization matters for both partners.

Practical next steps for couples

Review the pregnancy timeline and any ultrasound findings with a clinician.
Ask whether tissue testing or genetic testing was done.
Make sure chronic conditions such as diabetes or thyroid disease are well controlled.
Review medications and supplements.
For the male partner, improve sleep, nutrition, exercise, weight, and reduce tobacco, alcohol, marijuana, steroids, and heat exposure.
Consider a semen analysis if conception has been difficult or if there is recurrent loss.

Preconception health recommendations from the CDC preconception health resources can help couples prepare for another pregnancy.

Can Miscarriage Be Prevented?

Not all miscarriages can be prevented, especially those caused by random chromosome abnormalities. Still, some risks can be reduced.

Ways to lower modifiable risk where possible

Avoid smoking and secondhand smoke
Avoid heavy alcohol use and recreational drugs
Manage diabetes and thyroid disease
Achieve a healthier weight if advised
Review workplace or environmental toxin exposures
Optimize male fertility health as well as female reproductive health
Seek treatment for recurrent pregnancy loss when indicated, such as antiphospholipid syndrome or uterine abnormalities

It is important to be realistic: perfect habits do not guarantee a pregnancy will continue, and a miscarriage does not mean the couple did something wrong.

Common Myths and Misconceptions

Myth 1: A single miscarriage means infertility

Not true. Many people conceive and carry a healthy pregnancy after one miscarriage.

Myth 2: Stress alone usually causes miscarriage

Routine emotional stress is not usually the cause. Most early losses happen because of embryo chromosome problems.

Myth 3: Exercise or sex usually causes miscarriage

Normal exercise and sex do not usually cause miscarriage in an otherwise stable early pregnancy.

Myth 4: If the female partner miscarried, the male partner has no role

Not always true. Male factors such as sperm DNA damage and lifestyle risks may contribute in some couples, especially with recurrent loss.

Myth 5: If no cause is found, nothing can be done

Even unexplained recurrent pregnancy loss may benefit from structured evaluation, optimization of health, and specialist care.

Questions to Ask Your Doctor

Do my symptoms suggest miscarriage, ectopic pregnancy, or something else?
Do I need an ultrasound or repeat hCG testing?
Was this likely a complete miscarriage or is tissue still retained?
What symptoms mean I should go to the emergency department?
Do I need Rh immune globulin?
After this loss, when is it medically reasonable to try again?
At what point should we be evaluated for recurrent pregnancy loss?
Should my partner also have a fertility workup, including semen analysis?
Would sperm DNA fragmentation testing make sense in our case?
Do I need referral to a reproductive endocrinologist or fertility specialist?

Recurrent pregnancy loss (RPL): repeated miscarriages, often triggering a detailed evaluation.
Ectopic pregnancy: pregnancy outside the uterus; can mimic miscarriage but is a medical emergency.
Blighted ovum: gestational sac develops without a viable embryo.
Chemical pregnancy: very early pregnancy loss shortly after implantation, often detected only by a positive test.
hCG: pregnancy hormone used in blood tests to monitor early pregnancy.
Transvaginal ultrasound: key imaging tool in early pregnancy assessment.
Semen analysis: foundational male fertility test measuring sperm count, motility, and morphology.
Sperm DNA fragmentation: specialized test sometimes considered in recurrent miscarriage or unexplained infertility.

Frequently Asked Questions

How common is miscarriage?

Miscarriage is common. Many losses happen in the first trimester, and some occur before a person even knows they are pregnant.

Can a man cause a miscarriage?

Not directly in the way many people think, but male factors can contribute to embryo quality and pregnancy outcomes. Poor sperm DNA integrity, advanced paternal age, and unhealthy lifestyle factors may increase risk in some couples.

Does one miscarriage mean we will have trouble getting pregnant again?

Usually not. A single miscarriage is common and many couples go on to have a healthy pregnancy afterward.

When should we seek testing after miscarriage?

After one miscarriage, extensive testing is not always needed. After repeated losses, especially two or more depending on the clinical situation, evaluation becomes more appropriate.

Can stress, exercise, or sex cause miscarriage?

Routine stress, exercise, and sex do not usually cause miscarriage. Most early losses are related to embryo chromosome abnormalities.

What is a missed miscarriage?

A missed miscarriage means the pregnancy has stopped developing, but there may be little or no bleeding yet. It is often found on ultrasound.

Can sperm quality affect miscarriage risk?

Yes, potentially. Some studies suggest abnormal sperm DNA fragmentation and other sperm quality issues may be associated with miscarriage, particularly recurrent pregnancy loss.

How soon can you ovulate after a miscarriage?

Ovulation can return within a few weeks after an early miscarriage, though timing varies.

Do we need a semen analysis after recurrent miscarriage?

In some couples, yes. It may be reasonable when there is known male factor infertility, delayed conception, abnormal sperm health concerns, or unexplained recurrent loss.

References

Miscarriage is medically common, but that does not make it emotionally routine. If you or your partner have experienced a pregnancy loss, especially more than once, a thoughtful evaluation can help clarify what happened, what to test next, and how to improve the chances of a healthy pregnancy going forward.