==Summary== * '''Definition''' :A Osteoporosis is a systematic skeletal disease characterized by low bone mass, increase of bone fragility and susceptibility to fracture.
'''Types of Osteoporosis & its causes'''
#'''Primary osteoporosis(Type I (postmenopausal) or Type II (senile) )''':
##''Type I (postmenopausal)'': Generally develops in women after menopause when the amount of estrogen in the body greatly decreases. This process leads to an increase in the resorption of bone (the bones loses substance).