Shortwave Diathermy (SWD): Deep Heat for Chronic Pain
July 31, 2026 · 4 min read · by Saltnat Khan · 32
SWD delivers controlled deep heat to stiff joints and chronic muscle pain that surface heat packs can't reach.
Shortwave Diathermy uses high-frequency electromagnetic energy to generate heat deep inside muscles and joints — far deeper than a hot water bag or heating pad can penetrate.
Why deep heat matters
- Relaxes chronically tight muscles that don't respond to surface heat
- Increases flexibility of joints stiffened by arthritis
- Improves blood flow to speed up healing of chronic injuries
- Prepares tissue for stretching and manual therapy, making them more effective
SWD is especially useful for chronic neck and back stiffness, frozen shoulder, and long-standing joint pain that hasn't responded to basic heat therapy at home.
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