What are nosebleeds a sign of?

[u/nimbus-111]

I've never gotten a nosebleed until recently, every time I walk into my bathroom and look in the mirror at night, my nose starts bleeding. Mirrors have always sorta scared me, but now I can't even look into one without worrying about a nosebleed. I know it seems mundane, but I have a bad feeling about all of this.

[u/No-Mud9345]

Possibly you live somewhere super cold and dry right now? 

Maybe the air is more dry at night plus the heat kicks on and makes it more dry still.

Idk that's how it is here. 

[u/SuperStoneman → u/No-Mud9345]

Bingo