Light therapy risks and contraindications

Light therapy is a natural method widely used to improve mood, regulate sleep, or compensate for a lack of natural light. It's considered safe for the vast majority of users.

That said, certain situations call for extra caution or a medical consultation beforehand. Here are the main contraindications to be aware of before starting.

Bipolar disorder

Light therapy affects neurotransmitters, particularly serotonin and dopamine. In people with bipolar disorder, this stimulation can sometimes trigger:

  • hypomanic episodes;
  • unusual excitement;
  • reduced need for sleep.

In this case, use must be supervised by a healthcare professional.

Eye conditions

Certain eye conditions require extra vigilance:

  • macular degeneration (AMD);
  • retinopathies;
  • advanced glaucoma;
  • retinal damage.

Even though modern light therapy lamps are UV-free, exposure to intense light may not be suitable for all eye profiles.

Photosensitising medications

Certain medications increase sensitivity to light:

  • some antidepressants;
  • specific anti-inflammatory drugs;
  • certain antibiotics (tetracycline family);
  • dermatological treatments (retinoids, etc.)

As a precaution, medical advice is recommended before any light exposure.

Photosensitive skin conditions

Light therapy may be inadvisable in cases of:

  • lupus;
  • porphyria;
  • xeroderma pigmentosum.

These conditions involve an abnormal reaction to light.

Light-triggered migraines

People prone to photic migraines may experience:

  • headaches;
  • glare sensitivity;
  • visual discomfort.

In this case, it's advisable to:

  • shorten sessions;
  • increase the distance from the lamp;
  • or opt for light therapy glasses instead.

Children: any special precautions?

Light therapy can be used in children, particularly for:

  • sleep disorders;
  • disrupted sleep rhythms;
  • winter fatigue.

But always:

  • with shorter sessions;
  • under supervision;
  • after medical advice if in doubt.

Pregnancy

There is no formal contraindication to light therapy during pregnancy. It is even sometimes used to support mood in winter.

As a precaution, it's best to keep sessions short and use certified equipment.

Photosensitive epilepsy

Light therapy lamps emit continuous light (no flickering), which reduces the risk.

That said, if you've been diagnosed with photosensitive epilepsy, medical advice is still recommended.

When is light therapy risk-free?

For the vast majority of users, it can be used without issue for:

  • seasonal fatigue;
  • winter low mood;
  • mild sleep disorders;
  • lack of energy;
  • working indoors with limited natural light.

Best practices for safe use

  • Choose a UV-free certified lamp.
  • Follow the distance recommended by the manufacturer.

My personal experience

Before starting, I had some concerns about eye sensitivity. By following the recommended durations and distances, I experienced no adverse effects whatsoever.

The real key is gradual progression and consistency.

Key takeaways

  • Very few real contraindications.
  • Exercise caution with eye conditions.
  • Medical advice recommended for bipolar disorder.
  • Watch out for photosensitising medications.

Further reading