<s>[INST] What causes osteoporosis or osteopenia? [/INST] There are two main classifications of causes for bone loss:

Primary osteoporosis refers to bone loss as a result of aging (we lose bone density as we age), gender (women lose more bone density because of the reduction of estrogen after menopause), and genetics (about 62% of you bone structure is related to race and family history.)
Secondary osteoporosis refers to bone loss that is cause because you have a chronic medical condition or take a medication that can affect bone loss or increase fracture risk. These factors also may increase your risk of fractures. Source: American Bone Health. Link: https://americanbonehealth.org/frequently-asked-questions/. Field: Rheumatology. Disease: Ostoeporosis </s>