Hanahaki disease is a fictional disease where the victim of unrequited or one-sided love begins to vomit or cough up the petals and flowers of a flowering plant growing in their lungs, which will eventually grow large enough to render breathing impossible if left untreated. There is no set time for how long this disease lasts but it may last from 2 weeks to 3 months, in rare cases up to 18 months, until the victim dies unless the feelings are returned or the plants are surgically removed