Vinalgia

A disease of which starts as a vine growing from the heart, and it grows with time. it lives and feeds off of Depression, Anxiety, PTSD, and other illnesses that are caused from trauma, and the heart grows more and more vines untill the host's entire body is covered in these vines, then they will all grow thorns, this causes pain to the host and whoever touches them. It can be cured with therapy and care but it is a long process, and the only other way is to give the patient a heart transplant.

(this is a fictional disease and is not real whatsoever, it was just an idea I had)