My cousin got tennis elbow from building his deck last summer, same deal of pushing through the pain. That kind of repetitive strain really needs rest, not more grinding. He was in a brace for weeks.
People treat pain like a nuisance instead of a warning. Your body is telling you to stop before you do real damage. That wrist strain or tennis elbow is just the first sign. Pushing through it guarantees a longer, worse recovery later. It's not about being tough, it's about being smart and listening.