As the days get shorter and the weather is gets colder, some people may begin dealing with seasonal affective disorder.

Seasonal affective disorder, also known as SAD, is a form of depression following the seasons. Up to 6% of the population has SAD during the winter months, according to CVS Health.

CVS Health's senior medical director of behavioral health Shelley Doumani-Semino said people in their twenties and early thirties are among the most common group experiencing the disorder. But she said anyone with a history of mental health conditions can experience it, too.

Doumani-Semino said there are signs to look out for.

"At this period of time, people start to notice that their energy levels are low,” she said. “They may have additional anxiety, they feel down, sad, or even blue - different words to describe it. They may find that they're less prone to eating healthy food, want to sleep more, less exercise, and just don't feel themselves.

“One must really tune into self-care and really take time for yourself. We always take on way too much during the holiday season. We have expectations that are unrealistic."

Doumani-Semino said women are four times more likely to experience SAD, which she said is the same pattern as depression. She recommends seeking out professional help as soon as possible if you aren't feeling like yourself.

If you or someone you know is struggling or need mental health resources, you can call or text 988. Someone at the crisis hotline is there to answer the call 24/7.