Why are teens always tired? - NHS - Teen constantly tyred
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There are lots of potential causes of fatigue. Medical causes can include anemia, Lyme disease, low thyroid, other chronic medical issues, or medication side effects. Mental health issues such as excessive stress, depression or dysthymia can also cause significant fatigue. Find out why your teenager stays up so late and feels so tired and grumpy during the day – it's all down to their unique body clock.