It probably hasn't crossed your mind recently. You can't see it - not early on. You also can't feel it. You can't even tell that it's putting you at risk for painful fractures that can substantially reduce your quality of life. It's osteoporosis. The good news is it's preventable and treatable. Here's how to get a grip on it before it grips you.

Osteoporosis is a bone disease in which bone loses density and strength. Your bones become brittle, leading to a growing risk for fractures, especially in the spine, wrists, and hips.

According to estimates from the National Osteoporosis Foundation, the disease affects more than 10 million Americans. Another 43 million have the precursor to osteoporosis - low bone mass. Those numbers are expected to increase 30% by 2030. That means that these conditions will be present in 71 million Americans.