As temperatures climb across the UK, many of us might find ourselves feeling more irritable or short-tempered than usual. This isn't just a figment of our imagination, according to clinical psychologists. Research suggests a direct link between hotter days and an increase in aggression, incidents of road rage, and even a rise in emergency room visits for mental health concerns.
Dr. Susan Albers, a clinical psychologist, highlights that heat affects not only our physical state but also our psychological well-being. When the mercury rises, our bodies work overtime to maintain a safe internal temperature, typically between 36.1C and 37.2C. This involves a cascade of physiological responses, explains Dr. Craig Sawchuk, a psychologist. Our vascular system expands, allowing more blood to flow closer to the skin's surface to dissipate heat, leading to an elevated heart rate as the heart pumps more blood.
Alongside these internal changes, the body's sweat response is triggered. While sweating is crucial for cooling down, excessive perspiration can quickly lead to dehydration. Dehydration, in turn, can manifest as muscle cramps, headaches, fatigue, and difficulty concentrating, all of which contribute to emotional instability and changes in mood.
However, the impact of heat isn't uniform across the population. Dr. Albers notes that individuals' responses to high temperatures can vary significantly based on factors such as age, where they were raised, and pre-existing health conditions. Older adults and young children, for example, often struggle more with internal temperature regulation. Additionally, certain medications, including some antidepressants, stimulants, antihistamines, and blood pressure drugs, can impair the body's ability to cool itself effectively.
Beyond physical vulnerability, personality traits can also play a role. Dr. Kim Meidenbauer, an assistant professor of psychology, suggests that traits like neuroticism might increase the likelihood of experiencing worse emotional responses to hot weather. The inherent discomfort of feeling hot and clammy can be a major contributor to crankiness, and the body's physiological response to heat – such as an increased heart rate – can be misinterpreted as emotional distress, making us more prone to anger or irritation.