Heat wave: here are the 3 organs most threatened by rising heat this summer

France already suffered an early heat wave in mid-June. The heat wave will hit France again with peaks of more than 40°C. This summer will be even tougher in the South West and in the Rhône Valley. Extreme heat greatly affects the body. The body needs to stay cool for the body to function properly. Body temperature should be between 36°C and 38°C. Any change, either towards the cold or towards the heat, will cause the body to enter a phase of thermoregulation. When the weather changes, the body will function differently. When the external heat exceeds the maximum threshold of 38°C, the following three organs will be the most affected.


The brain and the heart are the most important vital organs. of the body human. In other words, they give life. The effects of heat waves on the brain can lead to dangerous complications. It is very important to remain alert, because the integrity of our nervous system depends on it.

When the mercury starts to rise above 37°C, the stress will start to increase. In general, a stressed brain does not bode well for health. Nerve communications will be disrupted. As a result, the cells may end up damaged.

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According to the explanation of Carlos G Musso, a doctor who practices in the Department of Human Physiology of the University Institute of the Italian Hospital of Buenos Aires (Argentina), heat can destabilize cell membranes. Exposure to 49°C can directly destroy some cells.

The heart

The heart is also threat because of the heat wave. The consequences differ, but some are the most worrying. The first is the acceleration of the heart rate. Specialists call it a “compensatory tachycardia”. In fact, intense heat causes dehydration. A dehydrated body will adopt a survival system. It is this mechanism that it will adopt that causes the “compensatory tachycardia”.

When a person is dehydrated, their body will increase the production of nitric oxide. The latter is supposed to improve blood flow by increasing the diameter of the vessels. The body will find ways to continue supplying blood and oxygen to the heart. As a result, blood circulation will become hyperdynamic.

Consequently, dehydration and hypotension will lead to fatigue. The person may even feel bad. At worst, those who tolerate heat less are at risk of myocardial damage. Those who suffer from cardiovascular difficulties are the most precarious in the intense heat.

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This is why we must avoid dehydration. Overhydration directly affects the heart. During periods of heat wave, it is necessary to drink water regularly, but it should be done in moderation. In fact, drinking too much water causes harmful effects on certain organs.

the intestines

According to health specialists, during heat waves almost two liters of water escape from the body through perspiration. Of course, low hydration will not be able to keep up with the needs of the body.

During very hot periods, you should drink at least 2.5 liters of water a day. However, so much water could affect digestion and elimination. In fact, salt and water can cause diarrhea or intestinal pain. In this case, the deletion will be done frequently. Sometimes this can lead to an overactive kidney. In case of hyperactivity, the kidneys can be damaged.

To better combat the heat, you should always keep it up. Hydration is essential, but keep in mind that ice water is not good for the body. And this, even less in times of great heat. Do not forget to consult people who live alone and/or are elderly.

The authorities are doing everything possible to spread actions to take for combating intense heat. If you have any further questions, please do not hesitate to contact the green number: 0800 06 66 66. This number has been enabled by the government since the start of the heat waves. A number available from 9 a.m. to 7 p.m. that helps the French during the heat wave period.

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