This legal maxim means right of action will not arise from a base cause.
Ex trupi causa non oritur actio is a legal maxim derived from a Latin term. It means that a base cause will not result in a right of action. Thus, an illegal contract is generally unenforceable.
In a leading case of Simpson v. Blass, The Court said that if the petitioner takes recourse of illegal conduct to prove his claim the Court will not accept such claim of the petitioner. No cause of action wil arises from an illegal act because it will be an abuse of the process of the Court.
In another leading case of Collins v. Blainturn, it was held that any agreement for compromise will be illegal and void regarding pending Criminal Prosecution.