Bones may weaken to such a degree that an opportunity may occur with minor stress or spontaneously. After a broken bone, chronic pain, and a decreased ability to hold out normal activities may occur. Osteoporosis could also be thanks to lower-than-normal maximum bone mass and greater-than-normal bone loss. Bone loss increases after menopause thanks to lower levels of estrogen. Osteoporosis can also occur thanks to a variety of diseases or treatments, including alcoholism, anorexia, hyperthyroidism, renal disorder, and surgical removal of the ovaries. Osteoporosis is a disease in which bone weakening increases the risk of a broken bone. It is the foremost common reason for a broken bone among the elderly. Bones that commonly break include the vertebrae within the spine, the bones of the forearm, and therefore the hip. Until a broken bone occurs there are typically no symptoms.