noun, noun or participle which takes 'suru', intransitive verb
vomiting blood; hematemesis
Medical term for vomiting blood; used both as a noun and as a suru-verb.
彼は昨夜、吐血して救急車で運ばれた。
He vomited blood last night and was taken by ambulance.
I had a gastroscopy to investigate the cause of the hematemesis.