The lowest temperatures recorded at the end of May and beginning of June 2026 in several Brazilian cities raise an alert for cardiovascular health. Capitals such as Curitiba, Porto Alegre and São Paulo dawned with temperatures below 10 °C in recent days, while cities in the Serra Catarinense recorded temperatures close to 0 °C.

In addition to thermal discomfort, intense cold can increase the risk of stroke by up to 20%, especially when temperatures are below 14 °C, according to data from the National Institute of Cardiology (INC).

How cold increases the risk of stroke

According to cardiologist Dr. Marcelo Bergamo, there is a direct relationship between the drop in temperature and the increase in overload in the cardiovascular system. “When the body is exposed to cold, a natural mechanism called vasoconstriction occurs, in which blood vessels contract to preserve body temperature. This narrowing increases blood pressure and makes the heart need to work harder”, he explains.

According to the doctor, this additional effort can favor serious cardiovascular events, especially in people who already have risk factors. “Hypertensive patients, diabetics, the elderly, smokers and patients with cardiovascular diseases need to double their attention during periods of more intense cold, because the body is already in a more vulnerable condition”, he warns.

Stroke symptoms

Dr. Marcelo Bergamo also highlights the importance of quickly recognizing the signs of a stroke. Among the main symptoms are:

• Sudden weakness or numbness in the face, arm or leg;
• Difficulty speaking;
• Mental confusion;
• Sudden loss of vision;
• Headache intense and sudden;
• Loss of balance or coordination.

“In the face of any suspicion, it is essential to seek immediate medical attention. In stroke, every minute makes a difference to reduce sequelae”, he reinforces.

How to protect yourself during cold days

The cardiologist recommends some simple measures to reduce cardiovascular risks during periods of low temperature:

1. Adequate thermal protection

Wearing layered clothing and protecting extremities such as hands, feet and head helps the body maintain a stable body temperature.

2. Blood pressure control

Monitor blood pressure regularly, especially on colder days, in addition to correctly taking prescribed medications.

3. Pay attention to alcohol consumption

Despite the momentary sensation of warming, alcoholic beverages can further harm the blood circulation.

4. Keep your body active

Light physical activities and stretching help improve circulation, preferably in environments protected from the intense cold.

5. Continuous hydration

Even with less thirst, it is important to maintain your fluid intake, including teas and soups.

“The cold requires greater attention to cardiovascular health, but preventive measures Simple steps already help significantly reduce risks”, concludes Dr. Marcelo Bergamo.

By Rayssa Martins