Many many causes: Possibilities include poor nutrition, sleep apnea, various medical disorders such as anemia, diabetes, or thyroid disorders, psychological factors such as stress and/or depression, and many others. It could even be from overwork or overexercising. While it's easy to provide a list of possibilities, your question can't be answered without more info. See a doctor for a personalized assessment.
Answered 4/23/2016
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9 doctors weighed in across 2 answers
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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