Systemic Dehydration – Identifying Indicators, Underlying Causes, Health Complications, and Therapeutic and Preventive Approaches
Mateusz Pawlak
2026-03-17
4 min. read
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Systemic dehydration represents a substantial health hazard, particularly for vulnerable populations such as young children and elderly individuals. While commonly associated with heatwaves, fluid deficiency can manifest year-round—including during colder months—or arise from a spectrum of generalized medical conditions. This resource provides a thorough examination of the causative factors behind dehydration, the hallmark symptoms accompanying this state, the potential physiological repercussions, and evidence-based approaches for both intervention and prevention.
Dehydration of the organism
To be able to function properly, we have to remember that water is water when the body loses more water than it takes, and the vast majority of it is in the cells, and precisely in the intercellular space. And the rest is located in the extracellular, i.e. the blood vessels, and between the cells of the body in the intracranial space.
Symptoms of dehydration
The first signs of dehydration are thirst and decreased urine production, which becomes denser and darker in color. As the body consumes the water tablets, there are other symptoms such as: stopped sweating, muscle cramps or nausea and vomiting. Chronic fatigue, problems with concentration and a feeling of lack of energy should motivate you to reach for a glass of water instead of coffee. Similarly, the situation of pain and dizziness.
Causes of dehydration
The risk of dehydration increases during prolonged heat, when water is lost as a result of sweating. The dangers associated with dehydrating during exercise can be read here. During a heat wave, a person can lose up to 10 liters of water. The condition is to fill in the gaps. The most vulnerable to heat are the elderly, children, obese, disabled, and urinary tract users. Dehydration in winter is much less obvious, but equally significant. The dangerous intensity of heat emitted along with water vapour during breathing also causes significant water loss.
Health consequences of dehydration
Vision problems, high blood pressure, persistent and painful constipation, sleepiness, chronic fatigue, drowsy eyes are just a few of the standard examples of dehydration. In addition, kidney problems can occur. Water deficiency causes toxic substances to not be excreted optimally, which can cause pneumonia.
Dehydration of the body treatment
The main recommendation during dehydration is to prevent further loss of water and to supplement the deficiencies. In case of hypertonic dehydration, it is necessary to administer non-electrolyte fluids, e.g. water or unrefined tea. However, care should be taken not to overcompensate the fluid deficiency.
How can we effectively prevent dehydration?
According to the 2010 recommendations of the European Food Safety and Health Agency, women's daily fluid intake should be 2 litres and men's 2.5 litres respectively. In infants, water needs can be calculated by taking 100190 ml/kg/day. Pregnant women should drink 2.3 litres of fluid and breastfeeding 2.7 litres. In the summer, water intake increases with increasing temperatures.