Lupus Flare: Triggers, Warning Signs and a Simple Flare Plan

By Anna Curran, RN, BSN, PHN · Last reviewed October 2026

A lupus flare is a period when your lupus becomes more active and your symptoms get worse. Common triggers include sun exposure, infections, stress, overwork and stopping lupus medicine. Flares can be mild or serious, so knowing your early warning signs and having a plan helps you and your doctor act quickly.

Flares can feel scary and unfair, especially when you have been doing everything right. The good news is that you can lower your risk and catch flares early. Here is what to know.

What Is a Lupus Flare?

Lupus usually goes back and forth between flares, when the disease is active, and remission, when symptoms calm down. NIAMS notes that flares can range from mild to serious and do not follow a set pattern.

A flare may bring back symptoms you have had before, like joint pain or a rash. It can also bring new ones. Some flares affect only how you feel. Others involve organs such as the kidneys, heart or lungs and need prompt treatment.

You will not always know why a flare happened. Sometimes there is a clear trigger, and sometimes there is not. That is not your fault.

Common Lupus Flare Triggers

Triggers are different for each person. These are the ones listed most often by NIAMS, Mayo Clinic and Cleveland Clinic.

Sun and UV light

Ultraviolet (UV) light is one of the best-known lupus triggers. It can cause rashes and, for some people, a wider flare with fatigue and joint pain. Cleveland Clinic notes that light from artificial sources can also be a trigger, and suggests avoiding fluorescent and halogen bulbs in favor of LED lighting.

Infections

Colds, the flu, urinary tract infections and other illnesses can set off a lupus flare. Many lupus medicines also make infections more likely, so it is important to treat them early.

Stress and overdoing it

Emotional stress, a hard week at work and pushing past your limits can all play a part. Cleveland Clinic lists stress, overwork and not getting enough rest as flare triggers.

Stopping or skipping lupus medicine

Stopping your medicine can bring on a flare. In a well-known 1991 study, people with stable lupus who stopped hydroxychloroquine were about 2.5 times more likely to flare than those who kept taking it. NIAMS advises never stopping your medicines without talking to your doctor first.

Certain medicines

Some medicines can trigger lupus symptoms or a flare. Mayo Clinic mentions some blood pressure medicines, anti-seizure medicines and antibiotics. Always tell every provider and pharmacist that you have lupus, and check before starting anything new, including over-the-counter products.

Other triggers

Injury or surgery
Smoking
Changes in season or temperature
Pregnancy

Early Warning Signs of a Lupus Flare

Many people notice warning signs a few days before a flare is in full swing. NIAMS lists these common early signs:

Feeling more tired than usual
Joint pain or swelling
A new rash or a rash that gets worse
Fever
Stomach pain or discomfort
Headache

Cleveland Clinic also lists swollen glands, dizziness, confusion or memory trouble, mouth sores and unexplained weight loss.

Your own pattern may be different. Over time, you will learn what your flares usually look like. A symptom journal makes that much easier.

What to Do When You Feel a Flare Coming

1. Do not wait it out alone

Call your doctor or rheumatologist early. Catching a flare early may mean a smaller treatment change and a faster recovery.

2. Keep taking your medicines

Unless your doctor tells you otherwise, keep taking your lupus medicines as prescribed. Do not raise, lower or stop any dose on your own, especially steroids. Stopping steroids suddenly can be dangerous.

3. Rest and pace yourself

Give yourself permission to slow down. Cut your to-do list to the most important tasks. Short rest breaks during the day can help you save energy.

4. Protect yourself from the sun

Stay indoors during peak sun hours, roughly 10 a.m. to 4 p.m. Wear a wide-brimmed hat and long sleeves, and use broad-spectrum sunscreen every day, even when it is cloudy.

5. Ease stress in simple ways

Try slow breathing, progressive muscle relaxation (tensing and then relaxing one muscle group at a time), calming music, a short walk, gentle stretching or writing in a journal. Talking with a counselor or a support group can also help.

6. Write it down

Note your symptoms, when they started, your temperature and anything that may have set them off. Take photos of rashes or swollen joints. This helps your doctor decide what to do.

When to Call Your Doctor

Call your doctor the same day if you have:

A fever, especially if you take steroids or immune-lowering medicines
Signs of infection, such as chills, a cough that will not go away or burning when you urinate
Foamy, bubbly or dark urine
New swelling in your legs, feet, hands or around your eyes
A new or spreading rash, or sores in your mouth
Joint pain and swelling that is getting worse
Warning signs that last more than a day or two, or are worse than your usual flares

When to Call 911 or Go to the ER

Get emergency help right away for:

Trouble breathing
Chest pain or pressure
A seizure
Signs of a stroke: sudden weakness or numbness on one side, a drooping face, trouble speaking, sudden confusion or sudden vision loss
A sudden, severe headache
Coughing up blood
A swollen, painful leg with sudden shortness of breath
Severe pain or very little urine

A Simple Lupus Flare Plan

Make your plan when you feel well, so it is ready when you need it. Share it with your doctor and someone you trust.

My usual early warning signs:
– Write down your top three, such as “extra tired,” “achy hands” or “rash on cheeks.”

My doctor’s contact info:
– Rheumatology office phone number
– After-hours or nurse line
– Patient portal login

What my doctor wants me to do when a flare starts:
– Ask your rheumatologist this question at your next visit and write down the answer. Some doctors give specific instructions, and some want a call first.

My medicine list:
– Every medicine, dose and time, plus allergies. Keep a copy in your phone and wallet.

My red-flag symptoms:
– The 911 list above, so you or a family member can act fast.

My support people:
– Who can help with meals, rides, kids or pets when you need rest.

My comfort plan:
– Rest, a cool and quiet room, simple meals ready to go, calming music, a heating pad or ice pack for sore joints.

How to Lower Your Risk of Flares

You cannot prevent every lupus flare, but these steps help:

Take your medicines every day as prescribed. A pill organizer and phone alarm can help.
Keep all rheumatology visits and lab tests, even when you feel fine.
Protect your skin from UV light every day.
Get enough sleep and plan rest into your week.
Stay active with exercise your doctor approves, like walking, swimming or stretching.
Do not smoke.
Wash your hands often and ask your doctor which vaccines are right for you.
Eat plenty of fruits, vegetables and whole grains.
Ask family and friends for help when you need it.

Frequently Asked Questions

How long does a lupus flare last?

It depends on the person and the flare. Some last a few days, while others last weeks. Calling your doctor early can help shorten a flare and keep it from getting worse.

Can stress really cause a lupus flare?

Stress is one of the triggers listed by NIAMS and Cleveland Clinic. It may not cause every flare, but lowering stress where you can is a helpful part of your plan.

Should I go to the ER for a lupus flare?

Most flares are handled by calling your doctor. Go to the ER or call 911 for trouble breathing, chest pain, seizures, stroke signs, severe pain or very little urine.

Can I take extra medicine when I feel a flare starting?

Only if your doctor has told you to. Do not change your dose on your own. Ask your rheumatologist ahead of time what you should do when a flare begins.

The Bottom Line

A lupus flare is a time when your lupus becomes more active. Sun and UV light, infections, stress, overdoing it and stopping medicine are common triggers. Learn your early warning signs, keep taking your medicines and call your doctor early. A simple written flare plan can help you act quickly and get back to feeling like yourself sooner.