Hot temperatures have cascading effects on the body, affecting not just physical health but also mood and behavior, according to experts. Studies show that on hotter days, rates of aggression, road rage, violence, and even emergency room visits for mental health concerns tend to increase.
How Heat Affects the Body
When temperatures rise, the body works hard to regulate core temperature, typically between 97F and 99F (36.1C and 37.2C). The vascular system expands to bring more blood to the skin's surface, allowing heat to dissipate. This process increases heart rate and triggers sweating, which can lead to dehydration if excessive. Dehydration may cause muscle cramps, headaches, fatigue, focus issues, and emotional changes.
Not everyone experiences heat the same way. Dr Susan Albers, clinical psychologist at the Cleveland Clinic, notes that when temperatures climb into the upper 80s and 90s Fahrenheit (30s Celsius), heat puts extra stress on the body. Older adults, young children, pregnant individuals, those with chronic conditions, and people taking certain medications (like antidepressants, stimulants, antihistamines, and blood pressure drugs) are more vulnerable. Personality traits such as neuroticism also increase the likelihood of negative emotional responses to heat.
Why Heat Makes Us Cranky
The discomfort of heat is a major factor, says Dr Kim Meidenbauer, assistant professor of psychology at Washington State University. The body's physical responses to heat—increased heart rate, sweating, shortness of breath—can mimic emotional distress. For example, a racing heart might be interpreted as irritation rather than a cooling mechanism, amplifying negative reactions to minor annoyances. Heat also disrupts sleep, further reducing tolerance for stress.
Managing Heat-Related Irritability
Experts recommend proactive strategies to cope with heat-induced mood changes:
- Avoid the hottest part of the day (10am to 6pm). Schedule outdoor activities for early morning or evening.
- Reset your nervous system by stepping into air conditioning, sitting in a dark room, or splashing cool water on your face. Public spaces like malls, libraries, and cooling centers can help if you lack AC at home.
- Carry a cooling kit with essentials like a reusable water bottle, portable fan, cooling towel, sunscreen, and electrolyte packs.
- Check on vulnerable individuals—young children, older adults, neighbors, and friends living alone—during heatwaves. Look for signs of heat-related illness like dizziness, headache, irritability, or confusion.
Dr Craig Sawchuk, a psychologist at the Mayo Clinic, emphasizes that while proactive measures help, some factors are beyond control. "The elements are the elements, and there can be times when we have little, if any, control over this. Lack of control can wear on our emotions," he says.
