Rheumatoid arthritis has two very different states, and they call for opposite things. Stiff mornings want heat. Hot, swollen flaring joints want cold.
Getting that wrong is the most common mistake people make, and it’s easy to check. The general rule is in heat or ice: a physio’s decision guide.
The hand test
Put the back of your hand on the sore joint, then on the same joint on the other side. If the sore one feels warmer, looks puffy or red, that joint is actively inflamed.
Heat on it usually makes it feel worse.
| What you notice | Use |
|---|---|
| Stiff for the first 30–60 minutes of the day, joints not hot | Heat |
| Stiff after sitting still | Heat |
| Joints hot, swollen, red, more painful than usual | Cold |
| Feeling generally unwell with a flare | Cold, and contact your team |
| Before your exercises | Heat, then move |
On that last row, the sequence matters: heat is the warm-up, not the treatment. And on swelling generally, hot or cold compress for swelling.
Using heat for morning stiffness
RA stiffness is typically worst first thing and eases as you move. Warmth before you start the day makes those first movements easier.
- Hands: rest them on the pad, cover on, lowest setting, 10 minutes. Then fist-to-open, 10 times, and thumb to each fingertip. See stiff fingers from hand arthritis, and if a finger catches, trigger finger.
- Knees, feet, hips: 10–15 minutes, then move the joint gently through its range. See knee stiffness in the morning and stiff hips.
- A warm shower does several joints at once and is often the easiest option. See moist heat vs dry heat.
Keep to the lowest setting. Skin can be thinner if you’ve been on long-term steroids, and some RA medications affect how skin heals: see using a pad on fragile skin. Check the skin after each session for toasted skin syndrome if you use heat daily.
Cold during a flare
A cold pack wrapped in a thin towel, 10–15 minutes, numbs the joint and feels better on hot, swollen tissue. Keep gently moving the joint through whatever range is comfortable, since complete rest stiffens it further.
A flare that lasts more than a few days, or comes with fever, needs a call to your rheumatology team rather than more home management. It may mean your medication needs adjusting. Having a written flare plan makes those days easier to navigate.
What heat is not
RA is an autoimmune condition, and the medication that controls it is what protects your joints from damage over time. Heat eases how stiffness feels. It doesn’t slow the disease, and it doesn’t substitute for treatment.
Alongside medication, the things that help most are regular movement, strengthening, protecting joints during daily tasks, and keeping weight in a healthy range. Related conditions with the same heat-and-movement pattern: ankylosing spondylitis and osteoarthritis of the knee and other joints. If you have psoriasis alongside joint pain, see eczema, psoriasis and heat.
Don’t use heat if…
- The joint is hot, red and swollen
- You have a fever
- You have reduced sensation in the area
- There’s any skin breakdown, ulceration or a rheumatoid nodule that’s broken down
Full list: who should not use a heating pad.
Contact your team urgently if…
- One joint is hot, swollen and very painful with fever. Joint infection is a risk on immune-suppressing medication and needs same-day assessment.
- You have any infection while on those medications
- New neck pain with pins and needles, hand clumsiness or unsteadiness, which needs prompt review in RA
- Chest pain, breathlessness, or new numbness anywhere
- Morning stiffness or flares are becoming more frequent
The heat pad we use
We’ve supplied the Bremed BD7800 since 2010. It holds a steady temperature, covers a whole lower back and has a machine-washable cotton cover. Physiotherapy clinics in Singapore use it with their patients.
Clinically reviewed by: Nigel Chua (Hand Occupational Therapist) & Louise Yow (Physiotherapist). This article is general information, not a diagnosis. electricheatpad.com sells electric heat pads.
