internal wound; internal injury
Medical or descriptive term for damage inside the body, often from trauma or disease.
事故で内傷を負った。
He suffered internal injuries in the accident.
外傷 refers to injury from an external cause visible on the body, while 内傷 refers to internal damage or illness with no external wound.
Compound of 内 (inside) and 傷 (wound), directly meaning internal injury.