My dad fell off a four-wheeler the other day and he now has a large purplish-red bruise over his left hip,kidney, and lower hip area. He is feeling nauseous, has a lot of pain in the area, and his bone is sore when a push on it. I need to know if we need to worry about internal bleeding or anything.

A "lot of pain" always triggers my advice to consult with a Physician. I would be concerned.

Is he willing to go a Doctor, just to be looked at?

Does he have blood in his urine?

A doctor visit to check a injury is never the wrong thing. There could be other injury