U.S. Embassy Warns Diarrheal Illness Is Rising Across Cuba as Water and Power Systems Deteriorate

A new U.S. health alert is warning that diarrheal illness is increasing significantly across Cuba—and that the problem is tied not simply to one contaminated meal or one local outbreak, but to the deterioration of the island’s water and electricity systems.

The U.S. Embassy in Havana issued the alert on September 4, telling travelers and residents to be especially cautious with water and perishable food. The warning says unreliable infrastructure is disrupting water supplies as well as the refrigeration and temperature control needed to keep food safe.

Importantly, the alert does not provide a national case count or identify a single pathogen. It describes a broad increase in diarrheal illness associated with worsening conditions across the country, not a confirmed nationwide outbreak of one specific disease.

Why failing power can quickly become a food-safety problem

Long blackouts do more than turn off lights. Refrigerators warm, pumps stop moving or treating water, and households lose the ability to preserve food safely. In Cuba’s summer heat, those failures can compound one another quickly.

Reuters reported early September 5 that residents across Cuba have complained for months about illnesses involving diarrhea, fever and body aches. Power cuts lasting for days have become common, Reuters said, leaving homes and businesses struggling with refrigeration and sanitation.

The embassy advised people to be wary of perishables that may not have been stored at a safe temperature and to avoid food that appears to have remained at room temperature for extended periods.

A health warning inside a much larger energy crisis

The immediate alert arrives amid a deepening fuel and electricity emergency. Reuters said the Trump administration’s fuel blockade, imposed nine months ago, has restricted shipments needed for power generation and intensified outages. The administration argues that sanctions are necessary to pressure Cuba’s government and has described the country as a national-security threat.

Cuba’s grid and power plants were already aging and unreliable before the latest U.S. pressure. The current emergency therefore reflects overlapping forces: longstanding infrastructure failures and domestic economic problems, worsened by sharply constrained fuel supplies and sanctions.

United Nations experts have taken a sharply different view of the U.S. policy. In a May statement, they called for an end to what they described as “energy starvation,” warning of severe effects on health, food, water and other basic rights. Reuters reported that U.N.-appointed experts warned again in August that tightening sanctions were increasing the danger of disease outbreaks.

What the warning means for travelers

The State Department’s standing Cuba travel information already advises Americans to prepare for prolonged outages by keeping phones and battery banks charged, carrying flashlights, and maintaining supplies of nonperishable food and water. It also warns travelers to plan for medical devices or medicines that depend on electricity or refrigeration.

Friday’s alert makes food and water precautions more urgent. Travelers should follow the embassy’s guidance, pay close attention to how food has been stored, prepare for interruptions in safe water and electricity, and monitor official alerts. The State Department also notes that U.S. credit and debit cards generally do not work in Cuba, which can complicate emergency purchases.

U.S. law prohibits tourism to Cuba and requires travel by people subject to U.S. jurisdiction to fit an authorized category or obtain an appropriate license. The health warning does not change those rules, but it adds a new practical risk for anyone already on the island or planning lawful travel.

No simple boundary between infrastructure and public health

The alert is a reminder that an electrical crisis can become a public-health crisis without a dramatic new event. When pumps, treatment systems and refrigerators repeatedly fail, ordinary safeguards begin to disappear.

For now, neither the embassy nor Reuters has reported a definitive nationwide total of illnesses. That missing number matters: it limits any precise estimate of the scale. But the embassy’s decision to issue a countrywide warning indicates that officials consider the pattern serious enough to demand immediate precautions.

As Cuba’s fuel, water and power problems converge, the key question is no longer only when electricity will return. It is how long homes, clinics and food systems can operate safely while the outages continue.