noun, noun or participle which takes 'suru', intransitive verb
internal bleeding; internal hemorrhage
Medical and everyday term for bleeding inside the body. Can be used as a noun or with する to describe the occurrence of internal bleeding.
事故で内出血を起こした。
He suffered internal bleeding from the accident.
打撲のあと、内出血しているかもしれない
After the bruise, there might be internal bleeding.