Medically reviewed by M. Thurairaj, Registered physiotherapist. · Last reviewed June 2026.
When heat helps
Heat tends to suit ongoing muscular stiffness and tension, like a tight neck, stiff lower back or general achiness, where it can feel relaxing and help the muscles loosen. Many people use a warm pack before stretching or at the end of the day. It is comfort-focused, easing how things feel rather than treating an underlying problem.
When to avoid heat
Avoid heat on a fresh injury that is hot, red or swollen, on areas of broken skin, infection or poor sensation, and anywhere you cannot feel temperature properly, as burns can result. If you are unsure whether to use heat or cold for a specific injury, it is worth asking a professional. For a recent acute injury, advice often differs from chronic stiffness.
Using heat safely
Use a warm, not scalding, pack, wrap it in a cloth, and limit it to around 15 to 20 minutes at a time. Never lie on a heat source so you fall asleep on it, and check your skin. Heat pairs well with gentle movement and, for ongoing muscular tension, with massage. Persistent or unexplained pain should be assessed rather than just heated.
Key takeaways
- Heat suits ongoing muscular stiffness and tension
- Avoid it on fresh, hot or swollen injuries
- Use warm, wrapped, for 15 to 20 minutes
- Persistent or unexplained pain needs assessment
Frequently asked questions
Should I use heat or ice?
Heat generally suits ongoing muscular stiffness, while a fresh, hot or swollen injury is usually not the time for heat. If unsure for a specific injury, ask a professional.
How long should I apply a heat pack?
Around 15 to 20 minutes at a time, warm not scalding, and wrapped in a cloth. Check your skin and never fall asleep on a heat source to avoid burns.