Heatwaves in Vietnam and human mind: Why extreme temperatures fuel irritability, mental strain

Many areas in the country are experiencing the hot weather, with temperatures reaching up to 40 degrees Celsius.

In psychology and neuroscience, numerous indicators have shown that high temperatures can affect emotional states and the ability to control behavior.

Physiologically, the human body constantly regulates itself to maintain thermal balance.

When exposed to high environmental heat, multiple physiological systems are activated simultaneously, including the nervous system becoming more reactive, the heart rate increasing to boost blood circulation, sweat glands working overtime, and breathing patterns shifting.

These responses demand substantial energy, pushing the body into a state of fatigue.

As a result, sensory thresholds drop, and even minor irritations can trigger disproportionately strong reactions.

Heat also disrupts sleep quality.

Many people experience difficulty falling asleep, fragmented rest, or shallow sleep during hot nights.

Sleep deprivation impairs the brain’s ability to process information flexibly, leading to increased irritability, impulsiveness, and reduced control over behavior.

Besides, high temperatures accelerate dehydration, which contributes to fatigue, reduced concentration, and diminished cognitive performance.

When prolonged, these effects can accumulate into heightened stress and persistent discomfort.

Environmental conditions further compound the problem.

Living or working in enclosed spaces with little greenery and poor ventilation intensifies feelings of suffocation and unease.

Heat-absorbing concrete structures and stale indoor air create an oppressive atmosphere that places additional strain on the nervous system.

When these factors converge, individuals are more likely to experience emotional imbalance.

Conflicts in relationships may increase, while productivity in both academic and professional settings declines.

Impulsive behaviors also become more common.

Coping with heat-induced stress

Dr. Tran Thi Hong Thu of Mai Huong Daycare Psychiatric Hospital in Hanoi said that the weather is one of the factors that can increase or reduce the risk of stress in individuals.

With the recent spell of hot weather, people’s mental state is affected to varying degrees.

They are more likely to feel discomfort and heightened stress, both physically and mentally.

Those who are already sensitive to weather conditions such as people who are ill or those working outdoors are particularly vulnerable to their negative effects.

Many individuals may already have underlying stress or tension, which can worsen in extreme heat, leading to a decline in overall health.

Symptoms can include exhaustion, poor appetite, disrupted sleep, increased heart rate, and elevated blood pressure.

Those with a history of depression, psychological trauma, or psychiatric conditions are especially susceptible to relapse under such conditions, as heat can overstimulate the nervous system.

Dr. Thu recommends limiting outdoor activities during peak heat hours and avoiding overexertion.

Staying hydrated is essential, while alcohol and stimulants should be minimized.

High-risk groups such as postpartum women or individuals dealing with grief, job loss, or illness should be particularly vigilant.

Persistent symptoms like prolonged insomnia and anxiety warrant timely medical consultation.

Families with members who have a history of mental illness should monitor them closely during heatwaves, ensuring they are not exposed to stifling environments or psychological stressors such as conflict or criticism.

Medical professionals also advise regular check-ups to adjust treatment plans when necessary.

Warning signs that require immediate attention include severe insomnia lasting several days, constant anxiety without clear cause, sudden loss of energy, extreme irritability, or significant loss of appetite.

Healing power of green spaces

Connection with nature has been shown to reduce stress effectively.

Taking walks in parks, spending time around greenery, or even introducing plants into living and working spaces can help create a calming environment.

In the face of harsh weather conditions, these small interventions provide essential mental relief.

Heat does not directly cause anger or emotional instability, but it weakens the body’s ability to regulate emotions.

As temperatures rise, the threshold for negative reactions lowers, allowing frustrations that would normally be controlled to surface more easily.

Maintaining emotional balance during sweltering days is not just about comfort but about preserving patience, clarity, and kindness in everyday interactions.