Can Autoimmune Diseases Cause Infertility?

What Are Autoimmune Diseases?

The immune system attacks bacteria and viruses to prevent infection. In autoimmune disease, this system loses the ability to tell the difference between foreign invaders and healthy tissue. It begins producing antibodies that attack the body's own cells, and depending on which cells get targeted, the resulting damage can show up almost anywhere. Autoimmune thyroid disease targets the thyroid gland. Type 1 diabetes destroys insulin-producing cells in the pancreas. Rheumatoid arthritis attacks the joints. Lupus can affect the skin, kidneys, joints, and blood vessels all at once.

There are more than 80 recognised autoimmune diseases, and they disproportionately affect women, particularly during their reproductive years. Researchers haven't fully worked out why women face a higher burden of autoimmune illness, though hormonal factors and genetic predisposition are both thought to play a role. Because these conditions often emerge or intensify between the ages of 20 and 40, they frequently overlap with the years people are trying to build a family, which makes understanding their effect on fertility especially important.

Can Autoimmune Diseases Affect Fertility?

Several autoimmune diseases have a documented link to fertility problems, but they don't all work the same way. Thyroid disease throws off the hormones that regulate ovulation. Premature ovarian insufficiency involves the immune system attacking ovarian tissue directly. Antiphospholipid syndrome doesn't touch the ovaries at all. Instead, it causes blood clots that can damage a placenta after conception has already happened. The degree of risk also depends on the individual. Someone with well-controlled Hashimoto's may have no fertility issues at all, while someone with the same diagnosis left untreated might struggle to conceive.

It's worth noting that having an autoimmune disease doesn't automatically mean infertility. Many people with these conditions conceive without medical intervention, particularly when the disease is well controlled. But uncontrolled or undiagnosed autoimmune activity raises the risk of fertility complications, and this is one of the reasons doctors increasingly screen for autoimmune markers in patients who are struggling to conceive or who have a history of recurrent miscarriage.

Which Autoimmune Diseases Are Linked to Infertility?

• Autoimmune Thyroid Disorders (Hashimoto's Thyroiditis and Graves' Disease)

The thyroid affects far more than metabolism. Thyroid hormone shapes how the pituitary gland releases the FSH and LH that trigger ovulation, so when thyroid hormone runs too low or too high, that signalling gets disrupted. Hashimoto's thyroiditis slows the thyroid down, which throws off cycle regularity and can push prolactin high enough to block ovulation outright. Graves' disease speeds the thyroid up instead, but causes similar problems like irregular cycles and a higher chance of losing a pregnancy early. Both conditions can also cause trouble through thyroid antibodies rather than hormone levels. A woman can test with a completely normal thyroid panel and still have antibody activity high enough to lower her odds of conceiving or carrying to term.

• Systemic Lupus Erythematosus (SLE)

Lupus doesn't typically damage the ovaries directly, but it complicates fertility and pregnancy in other ways. Flares during pregnancy raise the risk of miscarriage, preterm birth, and preeclampsia. Some medications used to control lupus, particularly certain forms of chemotherapy used for severe flares, can reduce ovarian reserve. Lupus is also closely associated with antiphospholipid antibodies, which bring their own set of pregnancy risks.

Doctors generally recommend that lupus be in remission for at least six months before attempting pregnancy, since conceiving during an active flare significantly raises the odds of complications for both parent and baby.

• Rheumatoid Arthritis

People with rheumatoid arthritis often take longer to conceive than people without it, and nobody knows why, though chronic inflammation in the reproductive tract is the leading suspect. The bigger practical issue is often medication. Methotrexate, a common RA drug, causes birth defects and has to be stopped months before conception. Doctors typically switch patients to a pregnancy-safe alternative well ahead of time so RA symptoms don't flare in the gap.

• Antiphospholipid Syndrome (APS)

APS causes the blood to clot more easily than it should. During pregnancy, those clots can block blood flow to the placenta, causing recurrent miscarriage, stillbirth, or poor fetal growth.

• Celiac Disease

Celiac disease is an autoimmune reaction to gluten that damages the lining of the small intestine. Left untreated, it can cause nutrient malabsorption severe enough to disrupt menstrual cycles and reduce fertility in both men and women. Undiagnosed celiac disease has also been associated with a higher risk of miscarriage and unexplained infertility. The encouraging part is that many people see their fertility improve after adopting a strict gluten-free diet and allowing the intestinal lining to heal.

• Type 1 Diabetes

Type 1 diabetes destroys the pancreas's insulin-producing cells, and blood sugar that gets out of range affects fertility on both sides of a couple. In women, it throws off ovulation and makes cycles unpredictable. In men, it can lower sperm quality over time. None of this rules out pregnancy. It just means glucose control has to be under control, ideally starting before conception.

• Premature Ovarian Insufficiency Caused by Autoimmunity

Sometimes the immune system skips the thyroid or the pancreas and goes straight for the ovaries, damaging the follicles where eggs develop. When this happens before age 40, periods become irregular or stop altogether, and fertility drops sharply. Autoimmune POI often shows up alongside Addison's disease or autoimmune thyroid disease. Having one autoimmune diagnosis makes a second one more likely, and doctors typically screen for these specific conditions once POI is confirmed.

How Autoimmune Diseases Affect Female Fertility

Thyroid disease affects ovulation before an egg is ever released. Autoimmune premature ovarian insufficiency goes further, destroying the follicles that hold eggs and reducing both their number and quality. Lupus and rheumatoid arthritis create enough inflammation in the uterine environment to make implantation harder, even when an embryo is otherwise healthy. Antiphospholipid syndrome waits until later, damaging the placenta after conception has already succeeded and causing loss in the first trimester or beyond. Medication impacts it as well, as several immunosuppressants used to manage these diseases aren't safe in pregnancy, so switching or stopping them has to be timed carefully to avoid a flare at the worst possible moment.

How Autoimmune Diseases Affect Male Fertility

Antisperm antibodies are the clearest example of autoimmune disease impacting male fertility directly. The immune system produces antibodies against sperm cells, cutting motility and making fertilisation harder. Type 1 diabetes works differently, damaging the nerves and blood vessels involved in erectile function and semen quality over years rather than attacking sperm directly. Autoimmune thyroid disease can affect men too, lowering sperm count and reducing motility in some cases.

How Are Autoimmune-Related Fertility Problems Diagnosed?

Doctors typically investigate an autoimmune cause after recurrent miscarriage, unexplained infertility, or irregular menstrual cycles. The tests that are done depend on the condition suspected:

• Thyroid function and antibody panels can catch autoimmune thyroid disease, even when hormone levels look otherwise normal.
• Antinuclear antibody testing points toward lupus.
• Antiphospholipid antibody testing is close to routine after repeated pregnancy loss, since APS explains a meaningful share of those cases.
• AMH levels and follicle counts show whether autoimmune activity has already reduced the ovarian egg supply.
• In men, semen analysis paired with antisperm antibody testing catches immune-related cases that a standard fertility workup would otherwise miss.

Getting a clear diagnosis usually takes more than one specialist. A rheumatologist or endocrinologist works alongside a fertility doctor, since autoimmune symptoms overlap heavily with other causes of infertility.

Treatment Options for Autoimmune-Related Infertility

• Managing the Underlying Disease

Treatment usually starts with controlling the autoimmune condition itself, and doing so often improves fertility on its own. For Hashimoto's, this means thyroid hormone replacement. Rheumatoid arthritis requires a disease-modifying drug that's safe to use around conception. Celiac disease often responds to a strict gluten-free diet. As the intestinal lining heals and nutrient absorption improves, fertility tends to recover too.

• Managing Antiphospholipid Syndrome in Pregnancy

APS needs a more targeted approach once pregnancy begins. Low-dose aspirin paired with heparin helps keep blood flowing to the placenta, reducing the clotting risk that would otherwise threaten the pregnancy.

• Addressing Reduced Ovarian Reserve

For autoimmune premature ovarian insufficiency, the underlying disease can't restore lost egg supply. If a woman's own ovarian reserve has dropped too far to work with, IVF using donor eggs becomes the more realistic path to pregnancy.

• Treating Antisperm Antibodies

Antisperm antibodies are treated along a spectrum depending on severity, ranging from corticosteroids to intrauterine insemination to IVF with sperm washing, which filters out antibody interference before fertilisation.

• Consulting a Reproductive Immunologist

Recurrent pregnancy loss without a clear explanation often requires a consultation with a reproductive immunologist. These cases rarely respond to a single standard protocol, which is why treatment tends to be built around the specifics of each case rather than a fixed approach.

When Should You Consult a Fertility Specialist?

Anyone with a known autoimmune disease should consult a fertility specialist or reproductive endocrinologist before trying to conceive. Beyond that, here are a few specific situations when they should consult a fertility specialist:

• Diagnosed with an autoimmune disease and planning pregnancy. Consulting early allows time to confirm the disease is well controlled and to review current medications for pregnancy safety.
• Trying to conceive without success for 12 months, under age 35
• Trying to conceive without success for 6 months, age 35 or older
• Two or more miscarriages, at any age
• Any indicators of an underlying autoimmune or clotting issue

Early evaluation matters because many autoimmune-related fertility problems respond well to treatment once identified. Waiting too long gives an underlying condition more time to cause damage, and by the time it's addressed, options like medication or lifestyle changes may no longer be enough on their own.

Conclusion

Autoimmune diseases can influence fertility through a range of pathways, from hormonal disruption and direct tissue damage to blood clotting complications that threaten an established pregnancy. The relationship between autoimmune disease and infertility is not the same for every condition or every patient, and many people with autoimmune illness go on to conceive and carry healthy pregnancies, particularly with proper management. Anyone with an autoimmune condition who is planning a family, or who has faced unexplained fertility struggles, stands to benefit from a coordinated evaluation between their treating specialist and a fertility expert. Early diagnosis and disease control remain the most reliable tools for improving reproductive outcomes in autoimmune-related infertility.