How does osteoporosis affect people who have it?

Depends. In the early stages, there might not be any symptoms. Symptoms in late stage of the disease include: bone pain, loss of height, stooped posture or pain from fractures that occur because of the osteoporosis (hip, wrist, vertebra-lower back, neck pain.) you need to be treated if you were diagnosed with osteoporosis. The condition will not get better on its own.
Fractures. Fractures are the main complication of osteoporosis. Prior to a fracture there are usually no symptoms.