Webmd.com can tell you & symptoms too

Dear friend Osteoporosis itself has no specific symptoms; its main consequence is the increased risk of bone fractures. Osteoporotic fractures are those that occur in situations where healthy people would not normally break a bone; they are therefore regarded as fragility fractures. Typical fragility fractures occur in the vertebral column, rib, hip and wrist. [FracturesFractures are the most dangerous aspect of osteoporosis. Debilitating acute and chronic pain in the elderly is often attributed to fractures from osteoporosis and can lead to further disability and early mortality.[3] The fractures from osteoporosis may also be asymptomatic. The symptoms of a vertebral collapse ("compression fracture") are sudden back pain, often with radiculopathic pain (shooting pain due to nerve root compression) and rarely with spinal cord compression or cauda equina syndrome. Multiple vertebral fractures lead to a stooped posture, loss of height, and chronic pain with resultant reduction in mobility. Have a nice day.

It's a weakening of the bones. They become sort of porous or spongy looking. It's very prevalent in women who have had children and they (along with all women) should take calcium supplements. Very often osteoporotic patients have what's known as spontaneous fractures. Most women should get bone density exams beginning with their 50th birthday.