Autoimmune conditions and why sex matters

Many autoimmune diseases are more common in women, though anyone can be affected. Joint swelling, persistent tiredness and rashes can occur with these conditions, but also have other explanations. These symptoms and the sex difference alone cannot tell you what is causing a change.

What an autoimmune condition involves

Your immune system usually helps defend you against infection. In an autoimmune disease, it mistakenly targets the body’s own healthy tissues. The organs or tissues affected depend on the condition. Some conditions mainly involve a particular organ; others can affect several parts of the body.

Symptoms may come and go. A period when symptoms settle is called remission, while worsening symptoms are often called a flare. Treatment depends on the disease, how severe it is and the symptoms it causes.

Why researchers study sex differences

The Office on Women’s Health describes many autoimmune diseases as more common in women than men. That wording reflects the population its information covers; symptoms deserve attention in anyone.

NIH describes research into differences in genes and hormones that might help explain this pattern. It says many pieces of the explanation are still missing. Most autoimmune disease is thought to develop through a combination of genetic susceptibility and other triggers or stresses on the body.

The research is continuing. It cannot tell you whether your symptoms come from a hormone problem. At an appointment, describe the symptoms themselves and their effect on daily tasks. Your clinician can consider the possible explanations.

Lupus, thyroid disease and rheumatoid arthritis

Lupus can affect the joints and skin, causing pain, rashes and tiredness. It can also involve organs such as the kidneys, lungs and heart. Symptoms may flare and settle, although some people have more constant symptoms.

Hashimoto’s disease involves an immune attack on the thyroid and can lead to an underactive thyroid. Possible symptoms include tiredness, difficulty tolerating cold, constipation, dry or thinning hair, and heavy or irregular periods. These symptoms need assessment to find out whether a thyroid condition is causing them.

Rheumatoid arthritis affects the lining of joints and can cause pain, swelling and stiffness. The small joints of the hands and feet are often affected early. Stiffness may be worse in the morning or after being still. Other parts of the body can be involved too.

Medicines have different jobs in autoimmune care. Some relieve symptoms, some reduce immune-system activity, and others replace substances the body can no longer make enough of. For an underactive thyroid, for example, treatment can replace thyroid hormone. Ask what each medicine in your plan does and what follow-up you need. Your pharmacist, GP or specialist can advise about the treatment you have been prescribed.

Plan pregnancy with the care team

Having an autoimmune condition does not rule out pregnancy. The Office on Women’s Health says women with autoimmune diseases can safely have children, but the risks depend on the condition and how severe it is. Some people’s symptoms improve in pregnancy; others have flares.

If you want to become pregnant, talk to your specialist and GP or primary care doctor before trying. They may suggest waiting until the disease is in remission and reviewing medicines. Some medicines used for autoimmune disease are unsuitable in pregnancy, and specialist pregnancy care may be needed.

Contact your GP or prescribing specialist now (UK), or your prescribing doctor (US or elsewhere), if you discover you are pregnant while taking regular medicines, so they can review your treatment promptly. Do not stop a prescribed medicine without talking to them: stopping treatment used to keep you healthy can harm you or your baby. Ask who will coordinate care between your specialist and maternity team.

When to get help

Seek urgent medical assessment today through your GP or NHS 111 (UK), or your doctor or an urgent care service (US or elsewhere), for sudden severe joint pain, particularly in a single joint; a hot, swollen or discoloured joint; difficulty moving it; or joint pain with fever, shivering or feeling generally unwell. Do not wait for a routine flare review.

Book a GP appointment in the UK, or see your doctor in the US or elsewhere, for recurring joint swelling or pain, persistent tiredness or rashes that concern you. Bring a record of symptoms and any relevant family history, including symptoms that seem unrelated.

If you already have an autoimmune condition and think a flare is starting, contact your care team. Ask what changes need urgent review, who to contact outside usual hours and when your next check is due. Bring any questions about managing activity, work or pregnancy to that conversation.