'Water poisoning': A hidden danger many people are unaware of.

We often hear the advice to drink enough water every day to maintain good health. However, like anything "good for health," water is only truly beneficial when consumed in moderation.

Drinking too much water, seemingly harmless, can lead to a dangerous condition called water intoxication, causing serious bodily disorders and even threatening life if not treated promptly.

What is water intoxication?

Water intoxication is a rare but dangerous condition that occurs when a person drinks so much water that their kidneys cannot process and eliminate the excess through urination. The water then accumulates in the body, diluting the blood and causing dangerously low sodium levels in the blood, a condition known as hyponatremia.

Sodium plays a vital role in maintaining fluid balance between cells and blood. When sodium levels drop, water begins to flood into cells to balance osmotic pressure, including in brain cells.

The consequence is that cells swell, causing increased intracranial pressure and affecting brain function. In severe cases, water intoxication can lead to seizures, coma, or death if not treated promptly.

Although uncommon, certain situations can increase the risk of water intoxication. For example, endurance athletes such as marathon runners or triathletes often sweat profusely and are encouraged to drink water continuously to avoid dehydration. However, if they only drink plain water without replenishing sufficient electrolytes (such as sodium and potassium), they may inadvertently cause a serious imbalance in their bodies.

A shocking example in the UK is the case of Leah Betts, a teenager who died from water intoxication after taking ecstasy. This drug causes the body to overheat and sweat profusely, forcing users to drink large amounts of water to compensate.

Symptoms of water intoxication

Water intoxication can cause a range of symptoms, from mild to severe, stemming from electrolyte imbalance, particularly hyponatremia. Initial signs are often vague, including headache, dizziness, fatigue, nausea, vomiting, and bloating. However, if left undiagnosed and untreated, the condition can progress rapidly.

Some people may begin to experience neurological symptoms such as confusion, disorientation, or altered states of consciousness. Water intoxication can also cause swelling of the extremities, along with effects on muscles such as weakness, aches, or cramps, resulting from a severe disruption in neuromuscular function due to sodium deficiency.

In severe cases, or if left untreated, water intoxication can lead to seizures, coma, and even death. While relatively rare, serious complications have been reported in practice.

A prominent example is the case of famous American actress Brooke Shields in 2023. She suffered severe seizures after consuming a large amount of water in a short period of time.

Doctors determined the cause was hyponatremia, caused by drinking too much water, which shows that even healthy people are not immune to this risk if they are not careful.

How is water intoxication treated?

When signs of water intoxication are detected, the first and most important thing to do is to immediately stop drinking more water, at least until instructed to do so by a medical professional.

During treatment, doctors will assess the root cause of the condition, such as whether the patient has underlying medical conditions, is taking diuretics or antidepressants, or other factors that may increase the risk of water intoxication. Identifying the cause not only leads to more effective treatment but also reduces the risk of recurrence in the future.

In most cases, patients with hyponatremia due to excessive fluid intake will be given intravenous hypertonic saline, a solution with a higher-than-normal sodium concentration. The goal is to rapidly restore blood sodium levels, thereby reducing cell swelling and pressure in the brain.

Depending on the severity, symptoms may improve within hours, especially with prompt intervention. However, in more severe cases or if water intoxication is prolonged, recovery may take several days and require close monitoring at a medical facility.

Proper treatment not only helps patients overcome critical conditions but also plays a crucial role in preventing permanent nerve damage, a rare but possible complication if hyponatremia is not properly controlled.

Is it possible to prevent water intoxication?

Water intoxication is entirely preventable, but there's no one-size-fits-all formula. Following common advice like "drink eight glasses of water a day" might be helpful for some, but not for others, as water needs vary greatly from person to person.

Physical activity levels, weather, humidity, diet, and health conditions such as kidney disease, heart disease, or the use of certain medications can all affect the amount of water the body needs.

This also means there is no specific limit considered "dangerous" for everyone; water intoxication usually results from drinking a large amount of water in too short a time, exceeding the kidneys' ability to process it.

The best advice for healthy people is to listen to their body's signals. Drink when you feel thirsty and stop when your thirst is quenched. If you feel nauseous, bloated, have a headache, or feel dizzy after drinking water, it could be a sign you've drunk too much.

A simple tip for monitoring your hydration level is to observe the color of your urine; pale yellow urine usually indicates you are adequately hydrated, while nearly colorless urine may be a sign you are drinking too much.

In short, drinking water properly isn't just about "drinking enough," but also about "drinking wisely," based on the body's actual needs rather than chasing fixed numbers. Understanding your personal limits and listening to your body is key to keeping hydration a good habit, rather than inadvertently becoming a health hazard.