Gout Flare: Why a Heat Pad Makes It Worse

If your big toe joint is hot, red, swollen and so tender that a bedsheet hurts, don’t put heat on it. That’s a gout flare, and heat makes it worse.

Cold is the right choice during a flare. Heat has a place with gout, but only between attacks and only for the stiffness left behind.

Why heat backfires

A gout flare is an intense inflammatory reaction.

Uric acid crystals form in the joint, and your immune system attacks them. The heat, redness and swelling you feel are that reaction, not a stiff muscle needing loosening.

Warmth widens blood vessels and brings more blood and fluid into a joint already straining with both. It adds to the swelling and the throbbing. Anything that makes the joint warmer, including a hot shower run over it, tends to sharpen the pain. That’s the same mechanism behind the 48–72 hour rule after an injury.

The same logic applies to any hot, red, angrily swollen joint, whatever the cause. See hot or cold compress for swelling.

What to do during a flare

• Cold packs. 10 to 15 minutes, wrapped in a thin towel, several times a day. Small studies suggest ice helps gout pain, and it’s what most people reach for.
• Elevate the joint and keep weight off it.
• Take your flare medication early. Gout treatment works best started in the first hours. If you’ve had attacks before and have something prescribed, don’t wait to see whether it settles.
• A cage over the foot, or the duvet folded back, so nothing touches the toe overnight.
• Keep drinking water.

Don’t massage a flaring joint, and don’t try to stretch or mobilise it. If you have diabetes or any numbness in the feet, nothing warm goes on the foot at any stage: see who should not use a heating pad and why feet are the highest-risk place for a pad.

Where heat fits in

Once the flare has fully settled, usually a week or two later, the joint and surrounding tissues can be left stiff and achy. Warmth suits that: 15 minutes on the lowest setting before you get moving in the morning, or before foot and ankle exercises.

The test is simple. Hot, red and exquisitely tender means cold. Stiff and achy, with normal colour and normal skin temperature, means heat is reasonable.

People with long-standing gout often also have osteoarthritis in the same joints, and that stiffness does respond to warmth. See heat for knee and joint pain. Other foot stiffness that behaves the same way in the morning: plantar fasciitis and a stiff Achilles.

The part that matters more than either

Heat and cold manage the discomfort of an attack. Neither lowers uric acid, and gout is a condition that quietly damages joints and is linked with kidney and cardiovascular problems.

If you’re getting repeated attacks, the conversation worth having is with a doctor about long-term uric acid treatment, not about which pack to use. Recurrent gout is very treatable, and plenty of people put up with years of attacks without ever having that conversation.

See a doctor urgently if…

• You have a fever with the hot, swollen joint. A joint infection can look very like gout and is an emergency.
• This is your first attack and nobody has confirmed it’s gout
• The redness is spreading up the foot or leg
• You feel generally unwell, or you have a joint replacement in the affected joint. See heat and ice after a knee replacement.
• The attack isn’t improving after a few days of treatment

Related: rheumatoid arthritis: heat for stiffness, not for flares, ankylosing spondylitis, and heat or ice: a physio’s decision guide.

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.