Recurrent Pregnancy Loss: Causes, Testing, and Treatment

It may happen because of:

• chromosome problems in an embryo;
• a uterine condition;
• hormone or endocrine disorders;
• certain immune or clotting disorders;
• genetic factors;
• age-related egg changes;
• other medical causes.

Sometimes testing finds no clear explanation.

Having recurrent losses does not mean that a future successful pregnancy is impossible.

• recurrent, meaning happening repeatedly;
• pregnancy, the state of carrying a developing embryo or fetus;
• loss, meaning that the pregnancy ends without a live birth.

Examples include:

• She was evaluated for recurrent pregnancy loss.
• The couple experienced three pregnancy losses.
• RPL may require genetic and uterine evaluation.

Common expressions include:

• recurrent miscarriage;
• RPL evaluation;
• pregnancy after recurrent loss;
• unexplained recurrent pregnancy loss;
• recurrent early pregnancy loss;
• recurrent pregnancy-loss clinic.

Some medical organizations define RPL as two or more pregnancy losses, while older definitions sometimes used three or more.

The losses may be:

• consecutive;
• nonconsecutive;
• clinically confirmed;
• documented by ultrasound or laboratory testing.

Because definitions vary, a clinician may begin evaluation after two losses, particularly when age, medical history, or other risk factors increase concern.

Possible causes include:

• chromosome abnormalities in embryos;
• parental chromosome rearrangements;
• uterine abnormalities;
• antiphospholipid syndrome;
• thyroid disease;
• uncontrolled diabetes;
• primary ovarian insufficiency;
• certain hormonal disorders;
• severe systemic illness.

Lifestyle, environmental, and sperm-related factors may also be considered in some cases.

Many people have more than one contributing factor, while others remain without a confirmed diagnosis after testing.

These may occur when an embryo has:

• an extra chromosome;
• a missing chromosome;
• a major structural chromosome abnormality.

Many such abnormalities happen randomly during egg or sperm formation.

The likelihood of chromosome abnormalities generally increases with reproductive age, especially because of age-related changes in eggs.

An abnormal embryo may stop developing even when implantation initially occurs normally.

The person may be healthy because all essential genetic material is present, but some eggs or sperm may receive an unbalanced chromosome arrangement.

Examples include:

• balanced translocations;
• selected inversions;
• other structural chromosome changes.

This may increase the risk of miscarriage or, less commonly, a pregnancy affected by a chromosome disorder.

Chromosome testing of the intended parents may be considered during RPL evaluation.

Possible examples include:

• uterine septum;
• certain fibroids;
• intrauterine scar tissue;
• congenital uterine differences;
• some endometrial abnormalities.

Evaluation may involve:

• transvaginal ultrasound;
• saline-infusion ultrasound;
• hysteroscopy;
• MRI in selected cases.

Not every uterine variation causes miscarriage, so findings must be interpreted carefully.

It is one of the better-established treatable causes of recurrent pregnancy loss.

Testing may involve specific antibodies, including:

• lupus anticoagulant;
• anticardiolipin antibodies;
• anti-beta-2 glycoprotein I antibodies.

A diagnosis generally requires both clinical and laboratory criteria.

When APS is confirmed, treatment during pregnancy may reduce miscarriage risk in selected patients.

Possible examples include:

• uncontrolled thyroid disease;
• poorly controlled diabetes;
• high prolactin in selected cases;
• significant ovarian dysfunction.

Clinicians may assess:

• thyroid-stimulating hormone;
• blood glucose;
• prolactin;
• other hormone levels based on symptoms.

The role of some hormone-related factors is less clear than others, so not every abnormal test directly explains repeated losses.

As egg age increases:

• chromosome abnormalities become more common;
• miscarriage risk rises;
• ovarian reserve may decline;
• fewer embryos may be chromosomally suitable for continued development.

Age does not explain every case of RPL, but it may strongly influence overall risk and treatment choices.

Sperm age and health may also have reproductive effects, although egg-related chromosome risk is often a larger factor.

Possible considerations include:

• abnormal sperm DNA integrity;
• severe oxidative stress;
• genetic abnormalities;
• advanced paternal age;
• lifestyle exposures.

A standard semen analysis does not measure every aspect of sperm DNA.

Specialized sperm tests may be considered in selected situations, although their usefulness varies and not all are routinely recommended.

• detailed pregnancy history;
• age and reproductive history;
• uterine imaging;
• parental chromosome testing;
• thyroid testing;
• diabetes screening;
• antiphospholipid antibody testing;
• review of medication and medical conditions;
• genetic testing of pregnancy tissue when available.

Additional testing depends on individual circumstances.

A broad panel of unproven tests may create confusion and unnecessary cost, so evaluation should focus on evidence-based possibilities.

Results may:

• identify a likely cause;
• help distinguish random chromosome errors from recurrent patterns;
• guide whether parental chromosome testing is needed;
• provide information for future treatment planning.

Testing does not always provide a clear answer, and contamination or laboratory limitations may affect results.

This is called unexplained recurrent pregnancy loss.

The absence of an identified cause does not mean the losses were imaginary or preventable.

It also does not mean that future pregnancy will necessarily fail.

Many people with unexplained RPL later have a successful pregnancy, sometimes without a specific treatment.

Possible approaches may include:

• surgery for selected uterine abnormalities;
• treatment of thyroid disease or diabetes;
• medication for confirmed antiphospholipid syndrome;
• genetic counseling;
• IVF in selected cases;
• preimplantation genetic testing when medically appropriate;
• donor eggs or sperm in specific circumstances;
• supportive monitoring during future pregnancy.

There is no single treatment that works for every person with RPL.

Therapy should target a confirmed or strongly suspected cause whenever possible.

PGT may help identify embryos with certain chromosome or genetic findings before transfer.

It may be particularly relevant when:

• a parent carries a chromosome rearrangement;
• repeated losses are strongly suspected to be chromosome-related;
• IVF is already being pursued for another reason.

PGT does not guarantee pregnancy or prevent every miscarriage.

Its value depends on age, number of embryos, genetic findings, and reproductive history.

Progesterone treatment may be considered in selected people with recurrent miscarriage, especially in particular clinical situations involving early pregnancy bleeding.

However, progesterone is not a universal treatment for all recurrent pregnancy loss.

Its usefulness depends on medical history and the specific pregnancy context.

A clinician should determine whether it is appropriate.

A person may experience:

• fear before appointments;
• anxiety about bleeding or cramping;
• reluctance to make pregnancy plans;
• repeated home testing;
• difficulty feeling reassured;
• distress around previous loss dates.

More frequent early monitoring may provide support, although it cannot prevent every miscarriage.

Emotional care can be as important as medical testing.

Possible effects include:

• reduced sexual desire;
• fear that sex could cause another loss;
• pressure around timed intercourse;
• avoidance of intimacy;
• grief during sexual activity;
• difficulty separating sex from reproduction.

Sex generally does not cause an uncomplicated early miscarriage, but medical restrictions may apply in specific situations.

Partners may benefit from discussing whether they want sexual closeness, nonsexual intimacy, or more time before resuming activity.

• grief;
• depression;
• anxiety;
• guilt;
• anger;
• fear of future pregnancy;
• relationship stress;
• social withdrawal.

Repeated losses can make each new pregnancy emotionally complicated.

Partners may experience grief differently, and neither response should be treated as more correct.

Counseling or pregnancy-loss support may help people cope with repeated uncertainty and bereavement.

In most cases, RPL is not caused by ordinary activities such as:

• working;
• walking;
• routine exercise;
• sexual activity;
• minor emotional stress;
• everyday household activities.

Medical factors may influence risk, but repeated miscarriage should not automatically be blamed on personal behavior.

• two or more confirmed losses have occurred;
• losses happen later in pregnancy;
• the person is older;
• there is a known genetic condition;
• menstrual cycles are unusual;
• infertility is also present;
• there is a history of blood clots or autoimmune disease.

A reproductive endocrinologist, maternal-fetal medicine specialist, genetic counselor, or other clinician may become involved depending on the findings.

Two losses mean future pregnancy is impossible.
No. Many people later have successful pregnancies.

RPL is exactly the same as infertility.
No. A person may conceive easily but have difficulty maintaining pregnancy.

Sex causes repeated miscarriage.
Usually not. Ordinary sexual activity does not generally cause miscarriage.

IVF always prevents another loss.
No. IVF and PGT may help in selected cases but cannot prevent every miscarriage.

The pregnant person is responsible for the losses.
No. Most causes involve biological factors outside personal control.

1. Recurrent pregnancy loss usually refers to two or more pregnancy losses.
2. The clinician recommended uterine imaging and chromosome testing.
3. Can recurrent pregnancy loss remain unexplained after evaluation?
4. Antiphospholipid syndrome is one recognized cause of repeated miscarriage.
5. Chromosome abnormalities account for many early pregnancy losses.
6. The couple met with a genetic counselor before another pregnancy.
7. Pregnancy after recurrent loss may involve significant anxiety.
8. Understanding recurrent pregnancy loss helps readers connect miscarriage, genetics, uterine health, fertility, and emotional recovery.

Repeated losses may change how partners experience sex, especially when intercourse becomes strongly associated with ovulation, pregnancy, fear, or grief. Sexual desire may decrease, fluctuate, or temporarily disappear.

Understanding RPL helps reduce self-blame, supports appropriate medical evaluation, and recognizes that reproductive loss can affect both physical and emotional aspects of sexual well-being.