Arthritis (arthro = ‘joint’) (itis = ‘inflammation’) is a condition of joints that become inflamed. These joints are red, swollen, sore, painful – often restricting movement around the joint. Arthritis can be caused by overuse of the joint and muscles around the joint, such as swinging a hammer 500 times in a day. We can create arthritis with poor nutrition such as too much protein. Sugar and non-sugar diet sweeteners are inflammatory.