Osteoporosis, or thinning bones, is not painful until it causes fractures, according to WebMD. Many people are unaware of changes in their bone density. The first symptom is a painful broken bone.
Spinal compression fractures -- small breaks in the backbone -- are the most common cause of osteoporosis pain, states WebMD. Back pain is extreme and comes on suddenly. Twisting or bending increases discomfort, while lying down eases the pain somewhat. These spinal fractures sometimes result in kyphosis, a condition characterized by a painful back hump.
Because bones are so delicate in people with osteoporosis, the movements of everyday activities can cause fractures, indicates WebMD. Pain typically decreases as the bone heals.