Can Red Light Therapy Make Symptoms Worse? What You Need to Know

Red light therapy is widely praised for its benefits across skincare, pain relief, muscle recovery, and even mood support. Using wavelengths such as 660nm and 850nm, red and near-infrared (NIR) light penetrate deep into the skin and tissues, stimulating cellular repair and reducing inflammation. But while the majority of users experience improvements, some people report worsened symptoms, especially when starting out.

1. It’s Rare—But Possible

While red light therapy is non-invasive, drug-free, and generally safe, there are individual cases where symptoms such as pain, fatigue, or skin sensitivity temporarily increase after use. This isn’t always a cause for alarm—but it’s worth understanding why it happens.

2. Common Reasons Why Some Users Feel Worse

➤ Overstimulation of Sensitive Nerves

For users with neurological conditions (like peripheral nerve hyperexcitability, fibromyalgia, or neuropathies), red light can unintentionally stimulate already overactive nerves, leading to increased pain, twitching, or discomfort.

➤ Too Much, Too Soon

Red light therapy works best with gradual exposure. Jumping into high-powered devices, long sessions, or close proximity to the skin can overwhelm sensitive tissues. Even 5 minutes might be too much for some people starting out.

Tip: Begin with 30–60 second sessions from a slight distance, every other day. Increase slowly.

➤ Temporary Inflammatory Reaction

Occasionally, red light can trigger a short-term increase in inflammation as the body begins its healing process. This is sometimes called a "healing crisis", and although it’s uncomfortable, it may resolve in a few days.

3. Who Might Be More Susceptible?

• Individuals with autoimmune conditions

• People with chronic nerve disorders

• Those using photosensitizing medications

• People with extremely fair or reactive skin

In these cases, a cautious and supervised approach is essential.

4. How to Reduce Risk of Side Effects

• ✅ Start slow: 1 minute per session, 3–4 times per week

• ✅ Stay at a comfortable distance (8–12 inches)

• ✅ Avoid red/NIR therapy during active flare-ups

• ✅ Talk to your doctor if you’re on medication or have a chronic condition

• ✅ Use devices that offer adjustable light intensity

5. When to Stop and Seek Help

If you notice increased nerve pain, muscle spasms, prolonged fatigue, or any unusual symptoms that last for more than a few days, it’s important to pause treatment and consult a healthcare provider.

6. The Takeaway

Red light therapy at 660nm and 850nm can offer remarkable benefits—but it’s not a universal solution. For some individuals, especially those with underlying nerve or inflammatory disorders, caution is necessary. Listening to your body, starting gradually, and personalizing your protocol is the key to safe and effective use.