When the cooler seasons come knocking, the annual cold season is never far behind. As temperatures drop, we spend more time indoors, which makes contact with viruses – especially the widespread rhinoviruses – easier. But how does a cold actually develop? What happens in your body, and which gentle and effective measures can help ease a cold or ward one off? Targeted red light for colds is one such option.

Table of contents

1. Causes of a cold – how it develops
2. The basics of red light therapy
3. Using red light for colds
4. Helping to prevent colds with red light therapy
5. Tips for everyday use
6. Summary and outlook

1. Causes of a cold – how it develops

A cold begins when viruses such as rhinoviruses or coronaviruses (not to be confused with SARS-CoV-2) enter the body through the mucous membranes of the nose, throat or eyes. Infection usually occurs via droplets spread by coughing or sneezing, or by touching contaminated surfaces.

As soon as the viruses enter the body, they use the cells of the mucous membranes as hosts in which to multiply. This does not go unnoticed by the immune system: it responds by initiating defence mechanisms. This reaction leads to inflammation, which in turn causes symptoms such as the following:

• Scratchy, sore throat
• Blocked or runny nose
• Cough
• A feeling of pressure or pain in the head
• Exhaustion and weakness
• Mild fever

However, the symptoms do not result directly from the action of the viruses but from the body's defence against the infection. To fight the viruses, the immune system releases what are known as cytokines. These signals dilate the blood vessels, allowing immune cells to reach the affected areas, such as the nose and throat, more quickly.

While this process strengthens the immune response, it also leads to typical complaints. A sore throat is caused by inflamed mucous membranes, a blocked nose by swollen tissue, and a cough by mucus irritating the airways.

A mild fever is another sign of the body's activity, as the raised temperature inhibits the multiplication of the viruses. However, these processes require a lot of energy, which is why people with a cold often feel tired and run-down.

Cold symptoms show how the body responds to an infection. Despite the discomfort, they are a natural part of the body's defence and recovery.

2. The basics of red light therapy

Red light therapy (RLT) is a special form of light therapy that uses light waves from the red and near-infrared range, typically with wavelengths between 600 and 850 nanometres. These light waves penetrate deep into the skin and have positive effects on the body's cells. By stimulating the mitochondria – the "powerhouses" of our cells – it stimulates and supports regeneration processes and various cellular functions.

The key effects of red light therapy include:

• Improved circulation
• Reduced inflammation
• Support for cell repair and regeneration
• Stimulation of collagen production
• Support for the immune defences

3. Using red light for colds

Red light and infrared light therapy can be used both preventively and as support during a cold. If a cold does strike, the goal is often to recover as quickly as possible. Red light therapy offers various mechanisms that can help to provide relief:

1. Improved circulation:

Red light promotes circulation in the areas of the body it is applied to. Improved circulation transports more oxygen and nutrients to the affected cells, while waste products such as carbon dioxide and inflammatory substances are cleared more quickly. This process supports regeneration and can noticeably ease symptoms such as a blocked nose or headaches.

2. Effect on inflammation:

A cold is usually accompanied by an inflammatory response to viruses. Red light can be supportive here by reducing the release of pro-inflammatory molecules such as TNF-α (tumour necrosis factor alpha) or interleukins. In this way, typical complaints can be eased and recovery supported.

3. Supporting immune function:

Red light therapy influences the immune system by stimulating the mitochondria. When exposed to the light, the mitochondria – the cells' energy suppliers – increase their activity, which improves energy supply and makes the cells more efficient. A stronger cell is better able to deal with pathogens, which may reduce the likelihood of a cold taking hold.

4. Soothing a sore throat:

A sore throat is a common symptom of a cold, and red light can help to ease it. Applying the light locally can reduce swelling and inflammation, which helps to ease discomfort. At the same time, the warmth of the red light has a relaxing effect on the muscles in the neck and throat area, further supporting wellbeing.

5. Easing headaches and tiredness:

Headaches and exhaustion are typical companions of a cold. Thanks to improved circulation and the anti-inflammatory properties of red light therapy, the intensity of headaches can be reduced and recovery supported, helping you get back on your feet sooner.

6. Easing aching limbs:

Aching muscles and joints are also a common side effect of colds. Red light therapy increases circulation and at the same time has an anti-inflammatory effect, which eases discomfort and relaxes the muscles. The soothing warmth also helps to loosen tense muscles and promotes the release of endorphins, which reduce the perception of pain. This helps the body to recover more quickly and leave unpleasant aching limbs behind.

4. Helping to prevent colds with red light

Are you looking for a natural way to help prevent colds? A red light panel could be the perfect addition to your home. The benefits are varied and far-reaching, and we believe every home should have one.

How can red light therapy help to prevent colds?

Using red light therapy (RLT) preventively to support the immune defences is based on several mechanisms that can strengthen the immune system and increase its resistance to infections. Here are some of the key ways red light therapy works:

Supporting immune cells
Red light acts directly on the mitochondria, the energy suppliers of our cells. They are responsible for producing ATP (adenosine triphosphate), which powers all cellular processes. When the mitochondria work optimally, cells can function efficiently – immune cells such as T lymphocytes and macrophages in particular benefit from this. These immune cells are crucial for recognising and fighting pathogens. A strengthened immune system can neutralise potential threats at an early stage, before an infection develops.

Promoting melatonin production
Regular red light therapy can stimulate the production of melatonin. Although melatonin is known as the ‘sleep hormone’, it also plays an important role in regulating the immune system. It has antioxidant and anti-inflammatory effects. By supporting melatonin production, red light can improve sleep quality – and good sleep is essential for a strong immune system, as immune cells are regenerated during deep sleep phases.

Improving microcirculation
Red light improves circulation and promotes microcirculation, ensuring that all the body's cells, including immune cells, are optimally supplied with oxygen and nutrients. Good circulation makes it easier for immune cells to reach infected or inflamed areas. This ensures that the immune defences act exactly where they are needed and that waste products are removed quickly.

Increasing antioxidant capacity
Red light therapy stimulates the production of antioxidants such as superoxide dismutase (SOD) and glutathione. These substances neutralise free radicals, which are produced during immune responses and can lead to cell damage. Free radicals are particularly active in inflammatory processes and can damage tissue. By promoting antioxidant capacity, RLT protects cells from oxidative stress and supports an effective immune response.

Reducing chronic inflammation
Chronic, low-grade inflammation can weaken the immune system and make the body more susceptible to acute infections. Red light therapy can help to reduce such inflammation by downregulating the production of pro-inflammatory messengers. This takes pressure off the immune system, allowing it to focus better on fighting acute infections.

Supporting collagen production
Collagen plays an important role in the structure and integrity of the skin and mucous membranes – the first line of defence against pathogens. By promoting collagen production, red light therapy helps to strengthen and regenerate these barriers. Healthy skin and mucous membranes are better able to prevent viruses and bacteria from entering.

Balancing hormones
Thanks to its relaxing effect, red light can lower levels of cortisol, the so-called ‘stress hormone’. Permanently elevated cortisol levels can impair immune function by inhibiting the activation of immune cells. Lowering stress levels strengthens the immune system so that it can fend off infections more effectively.

A red light panel is far more than just a device for acute complaints – it offers extensive opportunities to promote health and help prevent colds. Its wide-ranging effects on the immune system, circulation and cell regeneration make red light therapy a valuable aid for boosting wellbeing and staying fit through the cold season.

5. Practical use

Recommended areas of the body for red and near-infrared light

To help prevent a cold:

• Chest area: The chest plays a central role in supporting the immune system, as it is home to numerous lymph nodes that have an important function in fighting off infections.
• Upper back: Exposing the upper back to light improves circulation and helps to support the immune system.
• Face (forehead and sinuses): Applying light to the face supports the mucous membranes and can thus strengthen your defences against respiratory viruses.
• Throat and neck: Applying light to this area promotes lymph circulation, which contributes to better immune defences.

When you have a cold:

• Chest and lung area: Applying light to the chest can help to soothe the mucous membranes of the lungs and relieve the airways.
• Neck and throat: Applying light directly to the throat area can help to ease inflammation and soothe a sore throat.
• Face (forehead and sinuses): For complaints such as a blocked nose and headaches, applying light to the forehead and sinuses can help to relieve pressure and soothe the mucous membranes.
• Upper back: Applying light to the upper back, especially near the lungs, can help to ease coughing and support respiratory function.

A device that can expose the entire front of the body to light is ideal for effectively covering the areas mentioned. The heilys Gen100 panel is particularly suitable for this, as it can cover the whole side of the body at once, so there is no need to target each individual area separately.

6. Summary and outlook

The cold season may be unavoidable, but red light therapy offers an effective way to support the immune system and help prevent colds or ease their symptoms. By promoting cell health and stimulating the body's natural regeneration processes, RLT is a gentle yet effective way to stay healthier through autumn and winter. If you feel a cold coming on, a targeted light session could be just the thing to support your body in its fight against viruses.

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