Arthritis is the most common cause of joint inflammation. Other causes of joint inflammation include bone fractures, torn ligaments and tendons, ankylosing spondylitis and systemic lupus erthematosus, according to Healthline.
Inflammation is a process that the body uses to protect itself from infection, bacteria and viruses, states WebMD. At times, inflammation occurs when it is not needed, causing damage to the body's tissues. Osteoarthritis is the most common cause of joint inflammation, notes Healthline. It causes destruction of the cartilage in the joints, resulting in inflammation. A buildup of uric acid in the joints causes inflammation associated with gout, while bacteria or fungus is responsible for joint inflammation from septic arthritis.