it's true, I was looking for it too
https://www.mangaupdates.com/series.html?id=140821
There are fanfics that play with the hanahaki disease theme. The link is to ao3's list of hanahaki au, just click/ tap on "Works."
https://archiveofourown.org/tags/about%20a%20disease%20where%20you%20hallucinate*s*vomit%20flowers%20if%20you%20experience%20unrequited%20love
Hope you enjoy! (=・ω・=)
basically a person who has unrequited love for someone else will grow a flower in their lungs and if their feelings are not reciprocated back they can die from suffocation since the flower will continue to grow. symptoms are coughing out flower petals. the person with the disease can get surgery to remove the flower from the lungs but that can either result in the person never having feelings for the person (they used to like) or never having feelings at all (emotionless) after the surgery. the flower can only stop growing if their feelings are reciprocated back by the person they like but they have to truly believe that the person actually likes them. that's all ik of the hanahaki disease.
Hi! Can anyone please recommend me BL manga that one of the characters has a Hanahaki disease?