Ice Bath or Heat After a Hamstring Strain — and When?

Neither is a treatment for the strain, and the choice matters far less than most people assume. A 2008 review in the Emergency Medicine Journal examined the literature on cryotherapy for acute soft tissue injury and concluded there is insufficient evidence that it improves clinical outcome. Heat has a similarly limited evidence base after acute injury. Use either for comfort if it helps you move and sleep, keep cold brief rather than prolonged, and understand that what determines how this ends is the loading programme over the following weeks, not the temperature you apply in the first few days.

If you use it at all, in the first day or two, briefly, for pain relief. Cold reduces pain, blood flow, oedema and metabolic demand, which is why it feels helpful on a fresh injury. The caution is dose: animal studies reviewed in 2008 found that modest cooling reduced swelling but that excessive or prolonged cooling is damaging. Short applications, not long ones, and not as a substitute for getting the leg assessed.

Later rather than immediately. Heat increases blood flow, raises tissue metabolism and improves the elasticity of connective tissue, which makes it more useful for stiffness in the days and weeks after the acute phase than in the first 48 hours of a fresh tear. Many people find a warm shower or the sauna helpful before rehabilitation exercises for exactly that reason — it makes the tissue easier to move through range, which is a practical benefit rather than a healing one.

Yes, and it is about a different thing. A 2021 meta-analysis of 32 randomised controlled trials covering 1,098 participants found that cold applied within an hour of exercise reduced delayed onset muscle soreness within 24 hours, with no clear effect beyond. But DOMS is the normal soreness that follows hard training. A hamstring strain is a tear in the muscle. Evidence about the first does not establish anything about the second, and conflating the two is the most common error on this subject.

For post-exercise soreness, the 2021 meta-analysis found both reduced pain and that the difference between them was not statistically significant, though the largest effects it recorded were for hot packs, and a 2015 review noted trials in which heat-wrap therapy gave significantly greater relief of DOMS than cold did. The honest summary is that heat is at least as good as cold for soreness and its effect lasts longer. For an acute strain, neither has strong evidence and the choice is comfort.

Not in the first days over a fresh tear — heat increases blood flow to an area that is actively bleeding and swelling, which is the wrong direction early on. Once the acute phase has passed, sauna is generally fine and some people find it useful before rehabilitation work because warm tissue moves through range more easily. If in doubt about where you are in that timeline, that is a question for the assessment rather than for a guide.

The rehabilitation programme. A 2014 randomised controlled trial in the British Journal of Sports Medicine following Swedish elite sprinters and jumpers compared two protocols and found the content of the programme changed return-to-sport time, with lengthening-type loading outperforming conventional exercise. No equivalent body of evidence exists showing that ice or heat changes the outcome of a hamstring strain. That asymmetry is the whole point of this page.

There is no good reason to, and a reason to be cautious. Routine post-exercise cold has been shown in resistance training contexts to interfere with some of the adaptive signalling that training produces. If the purpose of your rehabilitation is to make the hamstring stronger and more tolerant, routinely cooling it immediately after each loading session is working against that purpose. Save cold for comfort when you need it, rather than applying it reflexively.

Sports injury assessment and rehabilitation with Level 5 qualified sports therapists — initial assessment £60, follow-up sessions from £40 — which is the route that addresses the injury. RE:UP also has two cold plunge ice baths at 4–7°C and an 8-person Finnish sauna at 90–110°C in a 90-minute Recovery Session from £20, at 20 Huxley Street, Broadheath, which people use for comfort and training-load management alongside a plan.

If you heard or felt a pop and cannot walk, if bruising is spreading down the leg, if there is a visible gap or lump in the muscle, if pain is severe and high up at the sitting bone, or if there is numbness or pins and needles. Those need a medical opinion, not a temperature. Proximal hamstring injuries in particular are managed differently from ordinary mid-muscle strains.