08-06-2026
Cardiology

Should patients with hypertension change their medication during summer?

How much water should older adults drink each day? The right way to stay hydrated and prevent dehydration during summer.

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Palpitations in summer: a normal response or a warning sign of heart disease?

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Lightheadedness in the sun: doctors warn of signs that require early medical evaluation.

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Dangerous hours to avoid being outdoors in hot weather: many people underestimate the risk.

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Is shortness of breath in hot weather dangerous? Warning signs that should not be overlooked.

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Cardiology
08-06-2026
Cardiology

Should patients with hypertension change their medication during summer?

Hot weather may cause blood pressure to drop or fluctuate. Patients should not reduce the dosage or discontinue their medication without medical advice. Learn how to monitor blood pressure safely during summer.
06-06-2026
Cardiology

How much water should older adults drink each day? The right way to stay hydrated and prevent dehydration during summer.

Dehydration is one of the common yet often overlooked health concerns in older adults. On hot days, even mild fluid deficiency may cause older adults to experience fatigue, dizziness, low blood pressure, confusion, or worsening of underlying cardiovascular disease, kidney disease, and diabetes.
04-06-2026
Cardiology

Palpitations in summer: a normal response or a warning sign of heart disease?

Palpitations during summer may be caused by dehydration, electrolyte imbalance, caffeine intake, or cardiovascular disease. Learn the warning signs that require early medical evaluation.
04-06-2026
Cardiology

Lightheadedness in the sun: doctors warn of signs that require early medical evaluation.

Lightheadedness when going out in the sun is fairly common during summer, especially among people who stay outdoors for long periods, drink too little water, stand under the sun for too long, or have underlying conditions such as blood pressure disorders, cardiovascular disease, anemia, or diabetes. This symptom may be transient as the body has not yet adapted to high temperatures, but it may also be a warning sign of a serious condition.
03-06-2026
Cardiology

Dangerous hours to avoid being outdoors in hot weather: many people underestimate the risk.

Hot weather not only causes a feeling of heat and discomfort, but may also increase health risks in people with underlying medical conditions. One common mistake is continuing to go outdoors, work, or exercise during peak heat hours without appropriate protective measures.
30-05-2026
Cardiology

Is shortness of breath in hot weather dangerous? Warning signs that should not be overlooked.

Shortness of breath in hot weather may occur when the body has to work harder to regulate its core temperature, especially after sun exposure, outdoor physical activity, or staying in a hot, poorly ventilated environment. In some people, this is only a temporary response and improves after resting in a cool place.
28-05-2026
Cardiology

Is a rapid heartbeat in hot weather dangerous? When should medical evaluation be sought?

A rapid heartbeat in hot weather may be a normal physiological response as the body increases blood flow to the skin to dissipate heat. This often occurs after sun exposure, outdoor physical activity, heavy sweating, or prolonged exposure to hot, humid, and poorly ventilated environments.
However, a rapid heartbeat may also be a sign of dehydration, low blood pressure, electrolyte imbalance, or cardiovascular disease, especially if it is accompanied by prolonged palpitations, chest pain, shortness of breath, dizziness, fainting, or a sensation of an irregular heartbeat.
28-05-2026
Cardiology

Silent dehydration in summer: early warning signs that should not be overlooked.

Dehydration does not always cause intense thirst. During summer, many people may become silently dehydrated, with symptoms such as dry mouth, dry lips, headache, mild fatigue, reduced urination, dark-colored urine, or dizziness when standing up. If prolonged, dehydration may affect blood pressure, cardiovascular function, kidney function, and increase the risk of heat exhaustion or heatstroke.
27-05-2026
Cardiology

Warning signs of heatstroke that require hospitalization: early recognition to prevent serious complications.

Heatstroke is a medical emergency that occurs when the body can no longer regulate its core temperature after prolonged exposure to a hot environment or excessive physical exertion. If not treated promptly, heatstroke can damage the brain, heart, kidneys, and many other organs. In the article below, doctors at Hong Ngoc General Hospital help readers recognize dangerous warning signs and understand when a patient should be hospitalized immediately.