Why Does Your Head Hurt In The Afternoon When It’s Hot?

High temperatures can trigger severe headaches at the end of the day. Experts explain why this happens and how to protect yourself from extreme heat.

With the arrival of intense heat, many people experience headaches that intensify in the afternoons. 

This common discomfort, far from being a simple temporary annoyance, may be related to factors such as dehydration, prolonged sun exposure, and changes in blood pressure, warn specialists.

Heat headaches often occur at the end of the day, especially in people who have spent long hours outdoors or in poorly ventilated spaces. The body, in trying to regulate its internal temperature, can undergo physiological changes that trigger this type of headache .

Among the main triggers of afternoon headaches during the hot season are:

• Dehydration: Increased sweating causes the body to lose fluids rapidly. If these fluids are not replaced properly, the brain receives less oxygen, which can cause moderate to severe headaches.
• Direct sun exposure: Being in the sun for long periods, especially without protection like a hat or cap, can cause heat exhaustion. This physical overexertion impacts the nervous system and can manifest as headaches, fatigue, and general malaise.
• Blood pressure changes: Heat can cause both high and low blood pressure. These sudden changes can cause headaches, particularly in people with a history of high blood pressure.
• Heat stress and accumulated fatigue: High temperatures exhaust the body. If you add to this a poor night’s sleep due to the heat, pain is more likely to appear toward the end of the day.

Other factors that intensify heat headaches

In addition to extreme heat, other conditions can aggravate headaches:

• Sleeping in hot or poorly ventilated environments.
• Stay in closed spaces without air circulation.
• Consume heavy or very salty foods.
• Being in front of screens for several hours at a time.

All of these factors increase physical and mental stress, which can intensify headaches during a hot day.

Recommendations to prevent heat headaches

To reduce your risk of heat headaches, experts suggest following these tips:

• Hydrate constantly throughout the day, even if you don’t feel thirsty.
• Avoid direct sun exposure between 12:00 and 17:00.
• Wear light-colored, lightweight clothing.
• Look for shaded or well-ventilated spaces.
• Sleep in a cool, dark environment.
• Eat light foods and avoid excess salt or sugar.

Take frequent breaks if working outdoors, trying to rest in the shade and drink fluids.

If you experience a headache, it is recommended to rest in a cool place, stay hydrated, and avoid bright lights and loud noises. If the discomfort is intense or accompanied by symptoms such as dizziness, nausea, or blurred vision, it is essential to see a doctor.

When can a heat headache be dangerous?
Although most heat-related headaches don’t pose a serious risk, in extreme conditions, they can lead to heatstroke or heat exhaustion, situations that require immediate medical attention. Paying attention to early symptoms and taking preventative measures can make all the difference.