7 surprising reasons you don't feel happy

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• Being unhappy is not the same thing as depression, which is an all-consuming feeling of emptiness.
• There are some reasons you might be feeling down, like not getting enough sleep or sunlight.

Feeling hollow and all-consuming emptiness may lead to a diagnosis of depression, and often this is after several indications something is wrong.

But sometimes you just feel down, and it may be harder to seek out the reasons why you're simply not as cheerful as you'd like to be.

Experts told Insider there are many signs that can explain why you're not feeling happy. Here are some of the most surprising ones.