Experts agree: “These are the risks of swimming in freshwater lakes”

As summer arrives, thousands of people seek relief from the heat at beaches, rivers, and lakes. However, health experts remind the public that swimming in freshwater environments carries certain risks that are worth understanding. Although the vast majority of swimming activities take place without incident, doctors note that some lakes may harbor microorganisms capable of causing infections and other health problems.

Specialists emphasize that freshwater lakes are not inherently dangerous. However, they are open natural environments that lack the filtration and chemical treatment systems found in swimming pools. As a result, water quality can fluctuate based on weather conditions, temperature, and the presence of contaminants.

The highest-risk situations typically occur in warm, stagnant water or in lakes showing visible signs of deterioration, particularly after heavy rainfall or when swimmers accidentally swallow water or allow it to enter their nasal passages.

The main health risks

Among the most well-known threats is the presence of parasites that can cause gastrointestinal illnesses. Two of the most common microorganisms are Giardia and Cryptosporidium, which are responsible for infections that often lead to diarrhea, abdominal pain, nausea, and other digestive issues.

Giardiasis is one of the most common parasitic infections. Although it is generally a mild and treatable illness, it can lead to dehydration if symptoms persist for several days.

The rare but feared “brain-eating amoeba”

One of the risks that receives the most media attention is Naegleria fowleri, commonly known as the ‘brain-eating amoeba’. This infection is extremely rare, but it is also one of the most serious.

Experts explain that infection does not occur from drinking contaminated water. Instead, it happens when contaminated warm freshwater enters the nose. Once inside the body, the amoeba can travel to the brain and cause a condition known as primary amebic meningoencephalitis.

Fortunately, cases are exceedingly uncommon. Experts point out that fewer than five infections of this type are reported each year in the United States. However, because of its extremely high fatality rate, any symptoms consistent with the infection require immediate medical attention.

How to reduce the risks when swimming

Specialists stress that there is no need to avoid lakes in order to enjoy the summer. However, taking a few basic precautions is recommended.

Among the most important recommendations are checking local water quality advisories before swimming and avoiding lakes with cloudy water, excessive foam, foul odors, or visible signs of contamination. Experts also recommend showering after swimming, drying off thoroughly, and washing your hands before eating.

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