# What Does Hot Weather Do to the Body?
Summer heat stresses the body in measurable ways. When temperatures rise, your core body temperature climbs, triggering your cardiovascular system to work harder. Blood vessels dilate to push heat toward your skin, your heart pumps faster, and you sweat to cool down through evaporation.
This process drains your body of fluids and electrolytes. Dehydration follows quickly, impairing cognitive function and physical performance. Your muscles lose efficiency. Your kidneys and liver work overtime to maintain balance. In extreme cases, heat exhaustion develops. Symptoms include heavy sweating, weakness, dizziness, and nausea. Heat stroke follows when your body temperature exceeds 40 degrees Celsius (104 Fahrenheit) and your cooling system fails entirely. Confusion, loss of consciousness, and organ damage result.
The risk varies by person. Older adults face the highest danger because their bodies respond less effectively to heat stress. Their thirst mechanism weakens, and they sweat less efficiently. People with cardiovascular disease, diabetes, or respiratory conditions encounter heightened risk. Medications for blood pressure, anxiety, or depression can impair heat regulation. Athletes and outdoor workers pushing physical limits in hot conditions also face greater exposure.
Children struggle with heat too, though differently. Their bodies generate more heat during activity and cool less effectively than adults. Infants cannot regulate temperature reliably at all.
Pregnancy amplifies heat sensitivity. Pregnant people have expanded blood volume and altered metabolism, making them more prone to overheating and dehydration.
Prevention begins with simple hydration. Drink water consistently, not just when thirsty. Limit caffeine and alcohol, which increase fluid loss. Wear light clothing, seek shade during peak hours (11 a.m. to 3 p.m.), and avoid stren