Heat Therapy

What it is

Heat wraps deliver superficial heat to the skin, and superficial heat is recommended for acute back pain [1]. Hot packs are another form of superficial heat [2].

What the research says

For acute back pain, a network meta-analysis of 46 trials (8,765 people) found heat wraps among the treatments that reduced pain straight after treatment, with uncertain evidence and high risk of bias in over a third of trials [3]. An earlier review of 13 trials found immediate pain relief with very low-quality evidence [4]. A 2026 trial of 99 adults found heat wraps alone or with exercise no better than a sham wrap after one week [1].

For muscle soreness after exercise, a meta-analysis of 32 trials (1,098 people) found heat treatment reduced soreness within and beyond 24 hours, with hot packs showing the largest effect [2].

Doses used in studies

In muscle-soreness trials, heat was applied within one hour after exercise [2]. These are the patterns in the trials, not recommendations.

Safety and interactions

The abstracts read for this page did not report burns or skin injuries from heat wraps, and no data were found on medicine interactions, pregnancy or upper limits. In the same network meta-analysis, adverse events were reported for opioids, NSAIDs and steroids, not for heat [3].

Caveats and open questions

The 2026 trial found no added benefit from exercise alongside a heat wrap [1]. For chronic back pain, an older review judged the data on superficial heat and cold insufficient [5]. Searches found no sham-controlled trials of heat wraps for chronic back pain.