Reasons for coughing up blood?

I’m 14. I woke up this morning and it felt like there was ‘drainage’ in my chest. I coughed a couple times, and thought it was just mucus stuff, so I spit into the sink. It was blood. I hadn’t coughed before then, so I don’t think I ruptured any small blood vessels, and it wasn’t mixed with mucus or anything, it was just blood. Maybe a teaspoon or a little less. I’m a little freaked out. I have a cough today, and my chest hurts a bit sometimes, but that might just be my imagination. Do you know what’s wrong??

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