# Red light therapy Series 2: What are the key safety considerations, contraindications, or risks of red-light therapy?

- URL: https://thehealthlodge.com.au/education/blog/red-light-therapy-series-2-what-are-the-key-safety-considerations-contraindications-or-risks-of-red-light-therapy/
- Published: 2025-10-20
- Authors: [Reine DuBois](https://thehealthlodge.com.au/practitioners/reine-dubois/)
- Tags: The Health Lodge
- Updated: 2026-10-14

Red-light therapy (RLT), also known as **photobiomodulation (PBM)**, is generally regarded as a **safe, non-invasive** and well-tolerated therapy when used correctly.
Unlike ultraviolet (UV) light, RLT does **not damage DNA** or increase the risk of **skin cancer**. Its safety profile is one of the reasons it has become a mainstay in both clinical and home wellness settings.

However, as with any therapeutic tool, there are **important precautions and contraindications** to ensure safe and effective use.

###

### **1. When Red-Light Therapy Should Be Avoided**

Certain medical conditions and life stages require caution or complete avoidance:

- **Active cancer or suspicious lesions:** Because RLT stimulates cellular repair and growth, it should be avoided over **active tumours** or **precancerous areas**. People with a history of cancer should seek guidance from their **oncologist** before use.
- **Photosensitive conditions:** Those with **lupus**, **porphyria**, or **albinism** may experience heightened skin sensitivity and should avoid RLT.
- **Seizure disorders (epilepsy):** Flickering light emitted by some older or unregulated devices can **trigger seizures**. Always check device specifications if you have a history of epilepsy.
- **Pregnancy:** While there is no conclusive evidence of harm, due to limited research RLT is best avoided over the **abdomen or lower back** during pregnancy.
- **Recent burns, open wounds or active infections:** Wait until the skin has begun healing; using RLT too soon may delay recovery or spread bacteria.
- **Fever or acute illness:** Because RLT slightly raises body temperature, it is best postponed during systemic infections or febrile episodes.

###

### **2. Sensitive Areas and Local Precautions**

- **Eyes:** Direct exposure to RLT can cause **eye injury**. Protective goggles are essential, particularly with high-intensity devices or near-infrared wavelengths. Those with **glaucoma**, **cataracts**, or recent **eye surgery** should avoid treating the face without medical supervision.
- **Thyroid gland:** People with **hyperthyroidism** or on thyroid medication should avoid applying RLT directly over the **neck**.
- **Tattoos:** Red or yellow pigments can absorb light differently, occasionally leading to **fading, colour change or irritation**. Cover tattooed skin or reduce exposure time.

###

### **3. Medication and Light Sensitivity**

Some drugs can increase **photosensitivity**, raising the risk of redness or burns. Common examples include:

- Certain **antibiotics** (e.g., tetracyclines).
- **Retinoids** or acne medications (e.g., isotretinoin).
- Some **anti-inflammatories** and **diuretics**.

Always check your medication leaflet and consult your prescribing practitioner if unsure.

###

### **4. Risks Linked to Dosage and Device Use**

Most adverse effects arise from **incorrect dosing** or poor-quality devices rather than the light itself.

- **Biphasic dose response:** RLT follows the *“less is more”* principle. An **optimal dose** triggers repair; too much can slow healing or cause irritation.
    - *Overuse* may cause redness, dryness, or rebound inflammation.
    - *Underuse* may fail to achieve a therapeutic effect.
- **Excess heat:** While RLT is non-thermal, powerful near-infrared devices can build heat, especially when used for long periods or in conjunction with **sauna therapy**.
- **Brain overheating:** When combining light and heat therapies, avoid raising **head temperature** excessively. Symptoms like dizziness, lethargy, or nausea indicate overheating.
- **Device quality:** Choose devices with reputable **medical safety certifications** (e.g., *IEC 60601-1*). Beware of misleading claims such as *“FDA registered”* without true device approval.

### **5. Professional Guidance Matters**

Even though RLT is available for home use, **professional assessment** can determine appropriate **dosage, wavelength, and treatment duration** for your condition. Integrative clinics like *The Health Lodge* use **medical-grade equipment** under clinical supervision, ensuring treatments are delivered safely within the optimal therapeutic window.

### **In Summary**

Red-light therapy is an exceptionally **safe and effective** tool for reducing inflammation, pain, and skin aging, but **precision and awareness** are key.
Avoid use during active illness, over tumours or the thyroid, and protect your eyes. Work with a trained practitioner to ensure your exposure levels are both safe and therapeutic.

**References:**

1. Hamblin MR. *BBA Clin.* 2016;6:113–124.
2. Chung H et al. *Ann Biomed Eng.* 2012;40(2):516–533.
3. Jenkins PA, Carroll JD. *Lasers Surg Med.* 2011;43(8):813-826.