The “May blues” refers to a dip in mood that hits during late spring, a time when most people assume everyone should be feeling great. It’s not an official diagnosis, but it overlaps significantly with summer-pattern seasonal affective disorder (SAD), a recognized condition where longer, brighter days trigger depression rather than relieve it. If you feel inexplicably low, anxious, or irritable as the weather warms up, you’re not imagining it.
Why Spring and Summer Trigger Depression
Most people associate seasonal depression with dark winter months, but the pattern can work in reverse. Summer-pattern SAD produces a distinct set of symptoms that look quite different from winter depression. Instead of oversleeping and overeating, people with spring and summer depression tend to experience insomnia, poor appetite, weight loss, agitation, anxiety, and increased irritability. Some people also experience restlessness or even aggressive behavior they wouldn’t normally display.
The contrast with winter SAD is striking. Winter depression pulls people inward: too much sleep, carbohydrate cravings, weight gain, social withdrawal. The May blues do the opposite, revving the nervous system up rather than slowing it down. This “wired but miserable” feeling is a hallmark of the spring and summer pattern, and it’s one reason people don’t recognize it as depression. It doesn’t match the popular image of what depression looks like.
The Role of Light and Sleep Disruption
In May, daylight hours increase rapidly. For most of the United States, the sun rises before 6 a.m. and doesn’t set until after 8 p.m., creating 14 or more hours of light. That extended light exposure suppresses your body’s production of the sleep hormone melatonin earlier in the evening and later into the morning, which can disrupt your sleep-wake cycle. If you’re sensitive to these shifts, the result is chronic sleep loss that compounds over weeks.
Poor sleep alone can produce anxiety, irritability, and low mood. When it happens gradually, night after night, you may not connect your worsening mental state to the changing season. You just know you feel off. The heat that often accompanies late spring adds another layer: higher nighttime temperatures independently reduce sleep quality, creating a feedback loop where lost sleep worsens mood and worsened mood makes it harder to fall asleep.
Allergies Can Make It Worse
May is peak pollen season across much of the country, and there’s a biological link between allergies and depression that goes beyond simply feeling miserable from a stuffy nose. When you inhale pollen, your immune system launches an inflammatory response in your airways. That inflammation doesn’t stay local. It triggers chemical signals throughout the body that can directly worsen mood, even in people who don’t have a history of depression.
Research published in the journal Psychotherapy and Psychosomatics found that people who reported mood worsening during high pollen counts were 1.68 times more likely to meet criteria for non-winter seasonal affective disorder compared to those whose mood stayed stable. The connection was specific to spring and summer depression; pollen-related mood changes did not significantly predict winter SAD. In other words, for some people, allergies aren’t just a nuisance. They’re actively fueling a depressive episode through inflammation.
Social Pressure and the “Happiness Gap”
There’s also a psychological component that makes the May blues feel uniquely isolating. Spring and summer carry an expectation of happiness. Social media fills with outdoor gatherings, vacations, and sunny smiles. If you’re struggling during a season everyone else seems to love, it’s easy to feel like something is wrong with you specifically, which deepens the low mood. This gap between how you “should” feel and how you actually feel can discourage people from seeking help or even acknowledging that the problem is real.
Spring Mental Health Crises Are More Common Than You’d Think
One of the most counterintuitive findings in mental health research is that suicide rates in the United States consistently peak in late spring and early summer, not in winter. A study analyzing U.S. data from 2015 to 2020 found that for adults aged 25 and older across every age group, suicides peaked in late spring and early summer, with the overall highest month being July. The trough, or lowest point, fell in late winter. The only exception was the 15 to 24 age group, which showed a different pattern with an autumn peak.
This doesn’t mean the May blues will lead to a crisis for most people. But it does confirm that the warm-weather months carry real mental health risks that are often overlooked because they don’t fit the cultural narrative around seasonal depression.
Managing the May Blues
Because summer-pattern SAD is essentially the mirror image of winter SAD, many of the strategies flip as well. Where winter depression responds to more light, the May blues often respond to less. Blackout curtains in the bedroom can block early morning light that disrupts sleep. Keeping your sleeping environment cool, ideally below 68°F, also helps counteract the insomnia that drives much of the mood disruption.
Sticking to a consistent sleep schedule matters more during this transition than at almost any other time of year. Going to bed and waking up at the same time, even on weekends, helps anchor your circadian rhythm against the pull of longer daylight hours. If allergies are part of your pattern, treating them aggressively with antihistamines or nasal rinses may improve your mood independently of any other intervention, simply by reducing the inflammatory load on your body.
Regular exercise helps, but timing matters. Working out earlier in the day supports sleep quality, while late-evening exercise can make insomnia worse. If your symptoms are significant, meaning they show up every spring, interfere with work or relationships, or last more than two weeks, this is a recognized clinical pattern that responds to therapy and, in some cases, medication. Tracking your mood across seasons for a year or two gives you and a provider clear evidence of whether the pattern is seasonal.