If your knees ache, you have probably asked this question standing in front of the freezer with an ice pack in one hand. The good news: the answer is simple once you know what each one does. Here is a plain-English guide, with no medical jargon.

The simple rule: ice for fresh, heat for old

Think of it this way:

• Use ice when the pain is new, hot, or swollen — a twisted knee this morning, a flare-up after gardening, a joint that feels warm and puffy.
• Use heat when the pain is stiff, tight, or chronic — the arthritic knee that aches every morning, muscles that feel knotted, joints that seize up in cold weather.

Ice calms inflammation down. Heat loosens things up. Most seniors with long-term arthritis actually benefit from both at different times of the day.

Why cold therapy works on joint pain

Cold narrows the blood vessels in the treated area, which reduces swelling and slows the nerve signals that carry pain. Doctors and physiotherapists have recommended it for decades precisely because it is simple and drug-free — no pills, no side effects, no interactions with your other medications.

For seniors, this matters. Many common painkillers carry risks when taken long-term, especially alongside blood pressure or heart medication. Cold therapy gives your knees a break without touching anything else in your body.

How to use cold safely: the 20-minute rule

• Apply cold for 15–20 minutes per session.
• Wait at least 30 minutes before the next session.
• You can repeat 3–4 times a day.
• Never place ice directly on bare skin — always keep a layer of cloth between the cold source and your skin.
• If you have diabetes, poor circulation, or numbness in your legs, check with your doctor first — you may not feel frostbite warning signs the way you used to.

When heat is the better choice

Morning stiffness that eases as you move around is the classic sign that heat will help. A warm shower, a heat pad, or a heated wrap relaxes the muscles around the joint and makes movement easier. Many people find the best routine is heat in the morning to get moving, ice in the evening after a day on your feet.

The easiest way to do both

The trouble with ice packs is holding them in place, and the trouble with heat pads is getting up to switch. That is exactly why we built the Infrared Sauna Blanket — full-body infrared warmth with 9 heat levels from 30°C to 62°C, independent front and back zones, and a built-in timer that does the timing for you.

You can also read our FAQ for more usage tips, or see how it compares to our other products on the product comparison page.

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