How cold therapy affects pain and inflammation.

Why the details matter

It is easy to hear “cold reduces pain and inflammation” as a universal promise. The research is narrower. Cold can temporarily change sensation, blood flow, and some lab measurements, while results that matter day to day vary by the condition, cooling method, and timing.

A plausible short-term pain mechanism

Local cooling can slow sensory nerve conduction and raise pain threshold. In one small controlled experiment, cooling the ankle to a skin temperature of 10°C reduced nerve-conduction velocity and increased pain threshold and tolerance.¹ That helps explain temporary numbing. It does not establish durable relief or correction of the cause of pain.

Inflammation is not one simple target

Inflammation is part of the body's response to injury and training. Cooling may reduce local perfusion and influence metabolic or inflammatory signals,² but lower blood flow or a changed biomarker is not automatically a better clinical outcome. The important outcomes are how a person feels and functions, whether tissue recovers, and whether harms occur.

What clinical reviews find

Evidence depends heavily on context. A 2026 review of cryotherapy after musculoskeletal surgery reported small average pain improvements that did not reach the authors' threshold for a clinically important difference, and found no substantial improvement in swelling or function.³ A Cochrane review of whole-body cryotherapy for post-exercise soreness found very low-quality, insufficient evidence.⁴

These findings should not be transferred directly to a localized mobile service. They demonstrate why “reduces pain and inflammation” needs a defined setting and outcome.

A useful way to talk about it

When pain needs evaluation

Cold can mask pain temporarily. New, severe, unexplained, worsening, or persistent pain—and pain with weakness, numbness, major swelling, deformity, fever, or loss of function—needs appropriate clinical evaluation rather than a wellness treatment.