Hi, I m 18, 185cm male, and I m not really sure how much I weigh, but I m fairly thin. My anus started hurting last night, I didn t think much of it and used the bathroom still. But now it hurts constantly, and a lot more when I cough or sneeze. It also bled this morning. I have no idea what causes it. Never had a problem with it before. Can you please tell me possible causes and how to fix it?