花吐き病

Etymology
From. An invention of Naoko  for her manga Hanahaki Otome (『花吐き乙女』).

Noun

 * 1)  Hanahaki, an illness affecting those consumed by unrequited love that manifests as the coughing up of flowers, which clears up upon reciprocation. A fictional illness, it has found popularity among both Japanese and foreign online fanfic (especially) artists and authors for its poetic quality.