Three smooth stones of different sizes on a linen cloth
Illustrative image

Short answer: they are neighbours on the same spectrum, in the order microwave, terahertz, infrared, and all three are non-ionizing.[2][3]

  • The spectrum in order: radio waves, microwaves, infrared, near-infrared, visible light, ultraviolet, X-rays, gamma rays.[2] Terahertz lies between microwave and infrared.[3]
  • Non-ionizing vs ionizing: radio waves, microwaves, infrared and visible light are non-ionizing; X-rays are ionizing.[1][2]
  • They can heat: non-ionizing radiation can heat substances, as a microwave oven heats food.[1]
  • A microwave oven is a different thing: it is a sealed appliance built to heat food rapidly, and it is not comparable to a handheld wellness device. We don't make claims about how our devices compare in power.
  • Research on terahertz is early.[3]

When to see a doctor

See a doctor if you have a question about safety with a medical condition or implant.

Sources

  1. CDC, About non-ionizing radiation
  2. NASA Science, The electromagnetic spectrum
  3. Zhao L, Hao YH, Peng RY (2014), Advances in the biological effects of terahertz wave radiation, Military Medical Research 1:26

Written by the Prife iTeraCare team and last reviewed on 10 October 2026. This is general information, not medical advice, and it does not replace your doctor or physiotherapist. A session is a wellness experience, not a medical treatment.

Book a free session and see iTeraCare for yourself at our Anna Nagar centre.