Arthritis pain is caused by several factors, such as:
Inflammation, the process that causes the redness and swelling in your joints;
Damage to joint tissues, which results from the disease process or from stress, injury or pressure on the joints;
Fatigue that results from the disease process, which can make your pain seem worse and harder to handle;
Depression or stress, which results from limited movement or no longer doing activities you enjoy. You can get caught in a cycle of pain, limited/lost abilities, stress and depression that makes managing pain and arthritis seem more difficult.