4. Extreme Fatigue

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"Twenty somethings may dismiss the feeling of being tired all the time and chalk it up to an active social life," says Finkleston.

"However, constant fatigue could be a sign of anemia." It also could indicate a lack of physical activity, a poor diet, anxiety, depression and more, according to WebMD, so it's important to see a doctor to get to the root of your problem.

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