Experts Warn: Summer Heat Can Trigger Mood Disorders for Millions of Americans

While seasonal depression is often associated with the darker, colder months, health experts say the summer heat can also play a significant role in triggering mood disorders. According to the American Psychiatric Association, approximately 13 million Americans are affected by seasonal disorders—and for some, those symptoms peak during the hottest months of the year.

In today’s Health Minute, Mandy Gaither reports that heat and humidity may do more than just make people uncomfortable; they can worsen mood disorders, including depression and anxiety.

“The difference between someone who's experiencing a normal stress-related response to heat versus something more serious really depends on whether those feelings persist,” mental health professionals explain. “If irritability, frustration, or sadness last longer than expected, it could be a sign of a mood disorder.”

One of the main reasons behind this is serotonin. Heat can impact serotonin, a neurotransmitter in the brain linked to mood regulation. For individuals already living with mood disorders, serotonin function is often disrupted—and extreme heat can further exacerbate those symptoms.

Those who are genetically predisposed to mood disorders may find the summer months especially difficult. Experts recommend paying close attention to persistent mood changes and seeking medical advice if symptoms do not subside.

To protect yourself or loved ones at high risk:

• Stay hydrated and cool

• Limit time outdoors during peak heat hours

• Maintain a healthy sleep routine

• Stay connected with supportive friends or professionals

If symptoms last more than two weeks, mental health professionals suggest contacting your healthcare provider to discuss treatment options.

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