If you tend to feel down or "off" around the same time each year, you could be experiencing a seasonal form of depression. While it can happen in the warm months too, seasonal affective disorder (SAD) is most common in the winter.

Here's what you need to know about winter-pattern SAD, or winter depression, including symptoms and care options.

Depression is a serious illness that collectively affects 20 million people in the United States. Because depression is common, there's a good chance you may know someone who experiences it, such as a friend, family member, or co-worker. 

It can be hard to know how to help someone with depression, but understanding the basics of this condition is a good first step in helping someone with depression. 

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Work-Life Balance via LinkedIn Learning