What can cause hair to become abnormally oily?

Anonymous
Recently, my hair has become really oily for no reason. Even after I shampoo and blow dry it, it's still oily and gross. At first I thought maybe I bought the wrong kind of shampoo, but I switched to another one and it's still oily as hell. Helppppppp! What is happening to my hair?
What can cause hair to become abnormally oily?
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