For whatever reason, a lot of people don't take repetitive stress injuries seriously. Maybe it's because they're harder to conceptualize than sudden, traumatizing injuries. Maybe people assume the slow degeneration of your bones, muscles and tendons is just a fact of life.
Workers' compensation insurers routinely fight repetitive stress claims, even when they're fully backed up by medical evidence. That doesn't mean repetitive stress injuries don't qualify for workers' comp -- they do. Sometimes it seems like insurers just deny them on principle.