While much attention has focused on extreme events like heat domes -  where high-pressure traps hot air over a region for days - the reality is that even without them, much of the world is now in its hottest time of year. Heat waves are longer, more intense, and more frequent than ever before.

The dangers go beyond discomfort. Prolonged heat can cause heat exhaustion or escalate to heat stroke -  a medical emergency with confusion, red dry skin, and unconsciousness. Crops suffer, power grids strain, and vulnerable populations pay the heaviest price. For most people, basic steps help: stay indoors at midday, wear light clothing, drink water often, and use fans or damp towels.

But for those with heart disease, poor circulation, or other chronic conditions, extreme heat is far more threatening. Their bodies struggle to regulate temperature, and common medications - diuretics, beta-blockers, antidepressants - can impair sweating, mask warning signs, or strain the heart as it works harder to cool the body. This can trigger chest pain, palpitations, or even heart failure.

For these high-risk individuals, extra care is vital. Never wait for thirst -  sip fluids every 15–20 minutes and replace electrolytes, but consult your doctor if you have fluid restrictions. Monitor your heart rate and watch for subtle red flags: unusual fatigue, shortness of breath, or chest tightness. Move to a cool space, apply cold packs to pulse points, and seek help if symptoms persist. Avoid icy showers -  sudden cold can cause dangerous spasms -  and always have a backup cooling plan. It is also wise to keep rapid diagnostic tests at home, such as blood pressure monitors or pulse oximeters, so you can quickly check your vital signs when feeling unwell and determine whether you need immediate medical attention or can manage with rest and cooling.

In short, extreme heat is a growing threat. While basic tips help everyone, those with chronic illnesses must treat hot weather as a medical emergency. Preparation, medication awareness, and quick response to warning signs can save lives. As the planet warms, personalized care is no longer opt.