One of the simplest, safest ways to ease joint symptoms from a rheumatoid arthritis flare can be done at home. Applying a warm or cold compress may help relieve RA pain, swelling, and stiffness. This approach works because temperature changes can affect inflammation, blood flow, and nerve sensation.
Keep in mind that heat and cold therapy—referred to as thermotherapy by medical researchers—only affects the area where it is applied. It will not change overall rheumatoid arthritis disease activity or pain/discomfort in the other parts of the body.
How heat helps
When you want to relieve joint stiffness and encourage easy joint movement, heat therapy can help. Heat therapy increases blood flow to muscles and other tissues, helping relax muscles and ease pain.
You can use heat therapy first thing in the morning, when the joints are stiffest, or to help warm up joints before exercise or another activity.
Heat therapy can be moist or dry. Moist heat may include applying a warm, damp compress or spending time in a shower, bath, or steam sauna. Dry heat may include applying heating pads or patches or spending time in a dry sauna.
Another form of heat therapy involves using a paraffin (hot wax) bath. A paraffin bath can be especially useful when hand or foot joints are painful. You can find paraffin bath supplies from beauty supply stores and major retailers.
If you use a heating pad or patch, make sure it’s not too hot and limit its use to 10 to 20 minutes, 1 to 3 times a day. Using heat therapy that’s too hot or applying it too often can damage skin. (In rare cases, damage from repeated heat exposure can be permanent.1)
Avoid using heat on joints that are very swollen. In such cases, cold therapy is a better bet.
How cold therapy eases pain
Applying a cold pack can be helpful especially when an RA flare-up brings inflamed, swollen joints. Cold therapy typically2:
- Constrains blood flow to joints, helping to ease inflammation
- Reduces the production and accumulation of fluids in the joint, which can limit swelling
- Slows down pain signals to the brain
Cold therapy is simple and can be low- or no-cost. Reusable and disposable cold packs are available for purchase. Cold-packs can also be made from items available at home, such as a bag of frozen vegetables or ice in a sealed plastic sandwich bag.
To prevent damage to your skin, limit cold therapy sessions to less than 20 minutes, and place a towel or other protective layer between your skin and the cold pack. You can use cold therapy a few times a day, but allow your skin to return to normal temperature before starting a new session.
Also, if you have Raynaud syndrome, gout, or nerve damage, avoid using cold therapy on the part of your body that’s affected.
Many people choose to use a combination of heat and cold therapy to treat painful joints. For example, once the worst of your RA flare-up is over and you can return to exercising, you can use heat therapy to warm up your joints before exercise, then cold therapy to soothe joints afterward.