Hanahaki, also known as The Unrequited Love Curse, is a disease that affects those with unrequited love. Those who are afflicted with it will cough up their beloved's favorite flower's petals, and as the disease gets worse, whole flowers.
The only known cures are for the loved one to return their feelings, or to have it removed, causing the victim to lose all memories of their love.
If they don't, they'll die.
A shame Discord became afflicted with it.
An attempt at angst.