+ -Text Size

Cold Laser Therapy

Other common name(s): low level laser therapy (LLLT), low power laser therapy (LPLT), soft laser, biostimulation laser, therapeutic laser, laser acupuncture

Scientific/medical name(s): none


The term cold laser refers to the use of low-intensity or low levels of laser light. Proponents claim that cold laser therapy can reduce pain and inflammation. The US Food and Drug Administration (FDA) considers these laser devices experimental, and allows them to be used in investigational studies based on some evidence that they may provide temporary pain relief. Cold laser treatment is thought to help some types of pain, inflammation, and wound healing, although stronger proof is needed. These lasers are used directly on or over the affected area.

Cold lasers are also sometimes used for acupuncture, using laser beams to stimulate the body's acupoints rather than needles (see Acupuncture). This treatment regimen appeals to those who want acupuncture but who fear needles.

Cold laser therapy providers advertise this method as a way to help people quit smoking, and some television stations have reported this as news. The treatment is supposed to relax the smoker and release endorphins, naturally-occurring pain relief substances in the body to simulate the effects of nicotine in the brain. Some claim that the treatment somehow balances the body's energy to relieve the addiction. Despite claims of success by some cold laser therapy providers, available scientific evidence does not support claims that this is an effective method of helping people stop smoking.

There is a great deal of variation in the types of lasers that are used and how they are used. Some devices do not have the output that they promise, and others are little more than light-emitting diodes (LED lights). Some advertise that they can help with herpes, high blood pressure, migraine headaches, wrinkles, cerebral palsy, and other conditions, claims for which there is little or no evidence. The FDA forbids statements that a treatment can help or cure diseases if scientific studies have not found it to be true. It has warned at least one seller of low level lasers to stop making such claims.

Well-controlled scientific studies are underway using reliable low level laser devices for pain, wounds, injuries, and other conditions. If these studies show positive results, certain types of cold laser treatment may eventually become part of conventional medical care.

This method should not be confused with conventional laser surgery, which is used as a proven treatment for some cancers. Hot lasers may be used to shrink or destroy tumors on the skin or on the surfaces of internal organs. They are sometimes used to remove colon polyps or tumors that are blocking the windpipe, colon, or stomach. They can help relieve symptoms of cancer, such as bleeding. Laser surgery for cancer is usually combined with other treatments such as conventional surgery, chemotherapy, or radiation therapy.

Additional resources

More information from your American Cancer Society

The following information on complementary and alternative therapies may also be helpful to you. These materials may be found on our Web site (www.cancer.org) or ordered from our toll-free number (1-800-ACS-2345).

Dietary Supplements: What Is Safe?

The ACS Operational Statement on Complementary and Alternative Methods of Cancer Management

Complementary and Alternative Methods and Cancer

Placebo Effect

Learning About New Ways to Treat Cancer

Learning About New Ways to Prevent Cancer


Energy medicine: an overview. National Center for Complementary and Alternative Medicine. Accessed at: http://nccam.nih.gov/health/backgrounds/energymed.htm on March 29, 2007.

National Cancer Institute. Lasers in Cancer Treatment: Questions and Answers. Accessed at: http://www.cancer.gov/cancertopics/factsheet/Therapy/lasers on May 30, 2008.

National Center for Complementary and Alternative Medicine. Energy Medicine: An Overview. Accessed at: http://nccam.nih.gov/health/backgrounds/energymed.htm on March 29, 2007.

Rindge D. Laser Acupuncture. Acupuncture Today. 2005 May; 06(5). Accessed at: http://www.acupuncturetoday.com/mpacms/at/article.php?id=30129 on June 3, 2008.

Swedish Laser Medical Society. Accessd at: http://www.laser.nu/lllt/LLLT_critic2_on_critics.htm on May 30, 2008.

Tuner J. Low level lasers in dentistry. Accessed at: http://www.laser.nu/index.htm on March 29, 2007.

US Food and Drug Administration. Laser Facts. Accessed at: http://www.fda.gov/cdrh/consumer/laserfacts.html on May 30 2008.

White AR, Rampes H, Campbell JL. Acupuncture and related interventions for smoking cessation. Cochrane Database Syst Rev 2006 Jan 25;(1):CD000009.

Note: This information may not cover all possible claims, uses, actions, precautions, side effects or interactions. It is not intended as medical advice, and should not be relied upon as a substitute for consultation with your doctor, who is familiar with your medical situation.

Last Medical Review: 11/01/2008
Last Revised: 11/01/2008