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If you live with chronic pain, fatigue, poor sleep, or fibromyalgia, emerging research suggests that heat therapy may offer meaningful benefits.

Two studies caught our attention.

Researchers found that warm-water therapy was associated with improvements in:

Pain Levels
Sleep Quality
Physical Function
Quality of Life
Overall Well-being

The review also noted that warm-water immersion may help reduce stress hormones and improve pain sensitivity, creating an environment where movement becomes easier and more comfortable.

For many participants, exercising in warm water was more tolerable than traditional land-based exercise.

Study #2: Hot Water Immersion and Heat Therapy

A 2025 pilot study examined the effects of regular hot water immersion over four weeks in people with fibromyalgia.

Researchers observed improvements in:

• Physical function
• Sleep-related impairment
• Pain perception
• Overall symptom burden

The authors proposed that heat exposure may influence inflammatory pathways, heat shock proteins, circulation, and pain signaling mechanisms that are commonly disrupted in fibromyalgia.

Why Heat May Help

Researchers believe heat therapy may work through several mechanisms:

Improved Blood Flow

Heat causes blood vessels to dilate, increasing circulation and delivery of oxygen to tissues.

Reduced Muscle Tension

Warmth encourages muscles to relax, reducing stiffness and discomfort.

Improved Sleep

Both studies identified improvements in sleep quality, which is especially important because poor sleep often amplifies pain and fatigue.

Reduced Stress Response

Warm water immersion has been associated with reductions in stress-related hormones and improvements in overall relaxation.

What This Means for Sauna Bathing

While these studies focused primarily on hot water immersion and aquatic therapy, they reinforce a growing body of evidence suggesting that heat exposure can positively influence pain, recovery, relaxation, and sleep.

Many guests at Ash & Sage report leaving their sessions feeling:

• More relaxed
• Less stiff
• Better rested
• More comfortable moving their bodies

While sauna therapy is not a treatment or cure for fibromyalgia, research continues to support the role of heat as a valuable wellness tool for managing symptoms and supporting quality of life.

The Takeaway

The science is increasingly pointing in the same direction:

Heat matters.

Whether through warm-water immersion, aquatic therapy, or sauna bathing, regular exposure to heat may help reduce pain, improve sleep, support recovery, and enhance daily function for individuals living with chronic pain conditions.

Sources

Impact of Water Therapy on Pain Management in Patients with Fibromyalgia Syndrome: A Systematic Review: here

The Impact of a Heat Therapy Intervention on Pain and Physical Function in Patients with Fibromyalgia: here

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