Low-level laser therapy

Also Known As: Low-level laser therapy, LLLT, K-Laser

Low-level laser therapy (LLLT) is a medical and veterinary treatment that uses low-level lasers or light-emitting diodes to alter cellular function. LLLT is controversial in mainstream medicine with ongoing research to determine whether there is a demonstrable effect. Also disputed are the ideal location of treatment (specifically whether LLLT is more appropriately used over nerves versus joints[1]), dose, wavelength, timing, pulsing and duration.[2] The effects of LLLT appear to be limited to a specified set of wavelengths of laser,[3] and administering LLLT below the dose range does not appear to be effective.[4]

Despite a lack of consensus over its ideal use, specific test and protocols for LLLT suggest it is effective in relieving short-term pain for rheumatoid arthritis,[1] osteoarthritis,[5] acute and chronic neck pain,[6] tendinopathy,[3][7] and possibly chronic joint disorders.[4] The evidence for LLLT being useful in the treatment of low back pain,[8][9] dentistry[10][11] and wound healingis equivocal.[12]

In 1967 a few years after the first working laser was invented, Endre Mester in Semmelweis University in Budapest, Hungary experimented with the effects of lasers on skin cancer. While applying lasers to the backs of shaven mice, he noticed that the shaved hair grew back more quickly on the treated group than the untreated group.[13]

LLLT has primarily been shown useful in the short-term treatment of acute pain caused by rheumatoid arthritis,[1] osteoarthritis,[5] tendinopathy,[3][7] and possibly chronic joint disorders.[4]LLLT has also been useful in the treatment of both acute and chronic neck pain.[6] A Cochrane Library review concluded that low level laser therapy (LLLT) has insufficient evidence for treatment of nonspecific low back pain,[8] a finding echoed in a later review of treatments for chronic low back pain.[9] Though it has been suggested for decades that LLLT could be useful in speeding wound healing, the appropriate parameters (dose, type of laser, materials, wavelength, etc.) have not been identified.[12] Similarly, the use of lasers to treat chronic periodontitis[10] and to speed healing of infections around dental implants[11] is suggested, but there is insufficient evidence to indicate a use superior to traditional practices.[14]

Stephen Barrett, writing for Quackwatch, concluded there was evidence to support LLLT use for temporary pain relief, but "there's no reason to believe that they will influence the course of any ailment or are more effective than other forms of heat delivery."[15]

Print this Page

All Treatments

Average Effectiveness

This is the Average effectiveness per ailment as reported by our participants (you).

  • 0 = No improvement or Worse
  • 1 = Slight improvement
  • 2 = Moderate Improvement
  • 3 = Significant Improvement
  • 4 = Cured

Order By

Type of Treatment

Date Range

Minimum Number of Users

Complete a survey on Low-level laser therapy to help the CureCrowd community

If you have tried to treat this ailment, please complete the following form to help us better our data, and help guide people to the best possible treatments. CureCrowd is a public resource with absolutely no vested interest in the outcomes of our studies.