How do I stop hair-loss and grow it back?

Hello. I am 27 years old and I’m losing my hair. I have no history of hair-loss in my family. The hair-loss is not in the normal places you lose your hair if you were going bald and is in spots. I’m constantly running my fingers through his hair and pull out pieces. Is there anyone out there what can be causing this? Smart asses welcome. I have a pretty good mood this attack. But I’d like serious input as well. So crack your jokes and give me advice. Please!

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