hanahaki is a fictional disease (?) where you cough flowers when you admire/love someone that doesn't return the favor. it's deadly since it can block your lungs and it can also develop thorns that can make you cough blood. there are two ways to cure it which is one; that certain someone must return the favor of loving/admiring you back, and two; the doctors will get rid of your hanahaki but will make you forget that you love the certain someone. deadly, but beautiful.