Rheumatoid Arthritis Flare: Signs, Triggers and What Helps

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

A rheumatoid arthritis flare is a stretch of time when your RA symptoms suddenly get worse, with more joint pain, swelling, stiffness and fatigue. Flares can be set off by things like overdoing it, stress, poor sleep, infection or missed medicine, and sometimes there is no clear cause. Rest, heat or cold, gentle movement and pacing can help, and your rheumatologist should know when flares happen.

If you are in the middle of a flare right now, be gentle with yourself. Here is what is going on and what you can do.

What Is a Rheumatoid Arthritis Flare?

RA tends to rise and fall. You may have calm periods when the disease is quiet. Then symptoms flare up, sometimes without warning.

The Arthritis Foundation notes that doctors and patients do not all define a flare the same way. In general, it means your usual RA symptoms get clearly worse for a period of time.

There are two broad kinds of flares:

Predictable flares have a known trigger, like a long day of activity or a bad cold. They usually ease with time and rest.
Unpredictable flares have no clear trigger. They may not get better on their own and often need a change in treatment.

Signs of a Rheumatoid Arthritis Flare

Flares look a little different for everyone. Common signs include:

More joint pain, sometimes steady and hard to escape
Swollen, warm or tender joints
Longer morning stiffness, with joints taking more time to loosen up
Heavy fatigue that rest does not fully fix
Stiffness that lasts much of the day during a bad flare
Feeling generally unwell, sometimes with a low-grade fever or poor appetite

It helps to know what your “normal” looks like. Then you can spot a change sooner.

Common Flare Triggers

According to the Arthritis Foundation, common triggers for RA flares include:

Overexertion: Doing too much in one day, even on a good day
Stress: Physical or emotional stress
Poor sleep: A few rough nights in a row
Infection: Such as the flu or another illness
Lowering or stopping treatment: Flare risk goes up when RA medicine is tapered or stopped

Sometimes, no trigger can be found at all. That is not your fault.

Track your flares

A simple flare log can help you and your doctor see patterns. Each time you flare, write down:

The date it started and ended
Which joints were involved
How long your morning stiffness lasted
What was going on in the days before (activity, sleep, stress, illness)
What helped

Bring this log to your appointments.

What Helps During a Flare

Rest, but do not stop moving completely

Rest is important during a flare. Give swollen, painful joints a break. Mayo Clinic advises not to exercise tender, injured or inflamed joints.

But total stillness can make stiffness worse. A good middle ground is gentle range-of-motion movement. Slowly move each joint through its comfortable range a few times a day, without pushing into sharp pain. A physical therapist can show you safe movements.

As the flare eases, slowly return to your usual activity. The Arthritis Foundation suggests easing back in once you feel better, rather than jumping right back in.

Try heat or cold

Heat can ease stiffness and muscle tension. A warm shower in the morning or a warm pack can help loosen joints.
Cold can dull pain and reduce swelling. An ice pack wrapped in a thin towel works well for a hot, puffy joint.

Some people prefer one or the other, and some switch between them. Protect your skin and use heat and cold for short periods. If you have numbness or poor feeling in your hands or feet, ask your care team before using heat or cold.

Pace yourself

Pacing means spreading out your energy so you do not use it all at once.

Break big tasks into small steps.
Take short rest breaks before you feel exhausted.
Switch between harder and easier tasks.
Put off what can wait, and ask for help with the rest.
Plan important tasks for the time of day you feel best.

Protect your joints

Joint protection means doing daily tasks in ways that put less strain on sore joints.

Use larger, stronger joints when you can. For example, carry a bag on your forearm instead of gripping it with your fingers.
Use tools with thick, easy-grip handles.
Try helpful devices like jar openers, reachers or button hooks.
Ask your doctor about a splint to support a painful wrist or hand.

An occupational therapist can teach you more ways to protect your joints and make daily tasks easier.

Calm your body and mind

Pain and stress tend to feed each other. Simple ways to relax can help:

Slow, deep breathing
Progressive muscle relaxation, where you tense and then release each muscle group
Calming music
Journaling about what you are feeling
Talking with a friend or an arthritis support group

Sleep and medicine

Try to protect your sleep during a flare. Keep a regular bedtime and rest when you are tired.

Take your RA medicines as prescribed. Do not stop or change them on your own. If you use over-the-counter pain relievers, check with your doctor or pharmacist first, since some can affect your stomach, kidneys or heart, or interact with your other medicines.

When to Call Your Doctor

A flare is not something you just have to tough out. Your rheumatologist needs to know, because frequent flares may mean your treatment needs a change.

Call your rheumatologist if:

Your symptoms are severe
A flare lasts more than a few days
Rest, heat, cold and your usual pain relief are not helping
Flares keep coming back
You have new symptoms you have not had before

Tell your doctor about a flare even if your lab tests look normal. Describe which symptoms changed and how much.

Get care the same day if one joint suddenly becomes very painful, hot and swollen, especially with a fever. This could be a joint infection, which needs fast treatment. Mayo Clinic notes that some RA medicines lower the immune response and make infections more likely, and that a joint infection can look like an RA flare.

Call 911 or go to the ER if you have chest pain, trouble breathing, or signs of a stroke such as one-sided weakness, slurred speech or a drooping face.

Also call your doctor if you have a fever or other signs of infection while taking RA medicines.

Frequently Asked Questions

How long does a rheumatoid arthritis flare last?

It varies. A flare from a known trigger may ease within a few days of rest. Other flares can last much longer and may need a change in treatment, so call your doctor if a flare lasts more than a few days.

Should I exercise during a rheumatoid arthritis flare?

Skip hard workouts and do not exercise inflamed joints. Gentle range-of-motion movement can help prevent stiffness. Ease back into your normal activity as the flare settles.

Is heat or cold better for an RA flare?

Both can help. Heat tends to ease stiffness, while cold can calm swelling and pain. Try each and see what works for you.

Can I prevent RA flares?

You cannot prevent every flare. Taking your medicine as prescribed, pacing your activity, getting enough sleep and managing stress may lower the chances. Tracking your flares can help you spot your own triggers.

The Bottom Line

A rheumatoid arthritis flare is a period of worse pain, swelling, stiffness and fatigue, often set off by overexertion, stress, poor sleep, infection or changes in treatment. Rest inflamed joints, keep up gentle movement, use heat or cold, and pace your day. Keep taking your medicines as prescribed, and call your rheumatologist if a flare is severe, lasts more than a few days or keeps coming back. Get same-day care for a single hot, swollen joint with fever.