After several days of stifling heat, the body is put to the test. Even when temperatures become mild again, many people continue to suffer from fatigue, headaches or trouble sleeping.
This delay between the end of weather alertness and physical recovery is completely normal. But it requires adopting the right reflexes to help the body recharge its batteries.
Fatigue after the heat: is it normal to feel exhausted?
It is not uncommon to feel completely drained once the heat wave has passed. Dr Gérald Kierzek, emergency doctor and medical director of True Medical, wants to be reassuring.
“Fatigue after a heatwave is common and often linked to acclimatization effort, dehydration and sleep debt. It is generally normal if it remains moderate and improves within a few days with simple measures.”
During a heatwave, the body works continuously to maintain its internal temperature at 37°C, which draws heavily on our reserves. However, vigilance remains necessary. The medical director of True Medical specifies: “If fatigue is disproportionate, worsens, or is accompanied by neurological or cardiovascular signs, this is not normal and requires medical evaluation”.
What are the most common residual symptoms?
The end of the heatwave does not mean the immediate disappearance of its effects on the body. It can take time for the body to regain its water and mineral balance. “Recovery from a heatwave often takes several days; fatigue, headaches and sleep problems are common”emphasizes Dr. Kierzek.
Among the signals that your body sends you are:
- A general drop in diet: Persistent fatigue, a feeling of weakness and a reduction in physical endurance;
- Psychological repercussions: Headaches, irritability and mood disorders due to prolonged discomfort;
- A disruption of biological rhythms: Sleep problems (insomnia, broken nights or non-restorative sleep) as well as a drop in appetite;
- The after-effects of dehydration: Muscle cramps, excessive thirst, dizziness or vertigo directly linked to loss of water and electrolytes.
How long does it take to fully recover?
The duration of post-heat convalescence varies from one individual to another, depending on age and general health. For the majority of the population, the return to normal is relatively rapid. “For most healthy people, return to normal occurs within a few days to a week after temperatures drop“, indicates the emergency doctor.
On the other hand, we must remain vigilant against the most vulnerable profiles. Dr. Kierzek recalls that “In fragile people, whether elderly, chronically ill or immunocompromised, recovery may last longer and require more monitoring.”.
Finally, if the episode was particularly intense, “After heat exhaustion or heat stroke, recovery may require several days and sometimes medical monitoring.
Our advice to speed up recovery and regain energy
To help your body overcome this decline, a few adjustments to your daily life are essential. Dr Gérald Kierzek advises implementing a four-point strategy:
- Optimize rehydration: You must rehydrate regularly with water and drinks providing electrolytes, or favor the consumption of fruits and vegetables rich in water;
- Prioritize sleep: To make up for sleep debt, focus on short naps, regular bedtimes and ensure the bedroom is cooled at night;
- Rebalance your diet: Opt for light but nutritious meals, and replace the salts and minerals lost through sweating by adding a little salt to your dishes or taking magnesium if necessary;
- Resume exercise gently: Resume physical activity gradually, with active rest the first two days, then a slow increase in effort.
When should you consult?
Dr. Kierzek emphasizes a crucial point. “If you notice signs of severe dehydration, persistent nausea or vomiting, or altered mental status, seek medical attention promptly.”
Finally, is it serious if you don’t feel completely recovered before the next heatwave? According to Dr. Kierzek, “it is not necessarily serious: a feeling of fatigue or slowing down is not unusual between two episodes of heat, especially if the resumption of effort was too rapid.
However, listening to your body remains the golden rule. The doctor concludes with an essential warning.
“On the other hand, if fatigue is accompanied by worrying symptoms such as confusion, loss of consciousness, high fever, vomiting, marked weakness, or if the person is fragile, it is imperative to consult before the next heatwave.”