One of the most common yet poorly understood diseases of middle and old age. A disorder of bone metabolism in which bone mass decrease. Osteoporosis occurs in about one-forth of all elderly people affecting mostly women ages 50 - 70. This also occur when estrogen drop after menopausal and secondary to other disorder.
Risk Factors:

Low sun [...]

Inflammation of one or more joints with an unknown cause.
Types:

Rheumatoid Arthritis - a chronic systematic, diffuse disease characterized by inflammatory changes in joints and realted structures resulting in deformities.

Signs and Symptoms:

Morning stiffness around the joints
Arthritis of three or more joints areas simultaneously have had soft tissue swelling or fluid observe by the physician.