The "depressive" face of osteoporosis and the "osteoporotic" face of depression.

Osteoporosis and depression are two chronic diseases that affect large population groups with great impact on morbidity, mortality and quality of life. An association between osteoporosis and depression has been described in the literature. Definitely, limited data suggest that osteoporosis may enhance depressive symptoms, while far more studies have shown that depression adversely affects bone density and increases fracture risk. However, neither causation nor a firm pathophysiological connection has been established. Thus the correlation of these diseases is still under research. This review comments on a plausible causative relationship and underlying mechanisms that might elucidate the link between two very common diseases. We describe the possible impact of osteoporosis on moods and the (better established) effect of depression on bone health. We also describe the effect of medication and review hormonal and cellular signals that may explain this effect.