Heat and chronic pain: why do your symptoms get worse in summer?

When temperatures rise, many people with chronic pain find their symptoms intensify. Joint stiffness, muscle tension, increased fatigue: these symptoms are not harmless. Here’s why heat affects your body, and how you can better manage these discomforts during the summer season.

Heat’s effects on body regulation

During hot weather, the body uses a number of mechanisms to maintain a stable internal temperature. These include vasodilation (dilation of blood vessels) and increased sweating. These physiological processes, although necessary, can have undesirable consequences for the body when it is already weakened by chronic pain.

Excessive sweating leads to a loss of minerals and electrolytes, essential for proper muscle and nerve function. A deficiency in these elements can accentuate fatigue, promote cramping and increase pain perception.

Hydration: a key factor often overlooked

Even mild dehydration can intensify joint and muscle pain. Insufficient fluid intake impairs the natural lubrication of joints and promotes inflammation. It can also affect blood volume, compromising tissue oxygenation and leading to a feeling of heaviness and exhaustion.

We recommend drinking regularly, even if you don’t feel thirsty, and adjusting your intake according to temperature and physical activity.

Heat and nervous system hypersensitivity

Certain pathologies, such as fibromyalgia or chronic pain syndromes, are linked to hypersensitivity of the nervous system. This phenomenon, known as central sensitization, makes the body more reactive to external stimuli, such as heat, which are then perceived as painful.

High temperatures can also disrupt the autonomic nervous system, leading to palpitations, sleep disturbances and feelings of general malaise, all of which amplify the intensity of the pain experienced.

Joint pain and heat: an ambivalent relationship

Contrary to popular belief, heat does not always have a beneficial effect on joint pain. In cases of osteoarthritis or inflammatory arthritis, excessive blood circulation and unstable atmospheric pressure can aggravate joint inflammation and feelings of stiffness.

Heat can also accentuate edema or numbness, particularly in the lower limbs, due to slowed venous circulation.

A few tips to limit the impact of the heat

• Hydrate regularly with water and mineral-rich drinks.
• Avoid going out during the hottest part of the day.
• Wear light, loose-fitting, breathable clothing.
• Encourage gentle activities such as swimming or stretching in an air-conditioned room.
• Adapt your diet: focus on water-rich fruit and vegetables and limit processed products.
• Make sure you get a good night’s sleep by maintaining a cool bedroom temperature.

A pain-free summer is possible

Extreme heat has a direct impact on chronic pain mechanisms. Understanding the physiological effects of heat enables us to better anticipate and mitigate its consequences. Paying particular attention to hydration, physical activity and general lifestyle hygiene can make a real difference during the summer.

Are you noticing an intensification of your chronic pain as the heat sets in? Don’t let these discomforts interfere with your well-being. The support of a team of professionals can make all the difference.

Physiothérapie Universelle offers you personalized support, based on a rigorous assessment and approaches tailored to your specific needs.

Make an appointment now to benefit from a customized treatment plan and regain greater comfort in your daily life!

References :

Extreme Heat | Gouvernement du Québec

The Health Effects of Heat | Gouvernement du Québec