Rheumatoid arthritis (RA) is a chronic inflammatory disease that affects about 1% of the human population. Its incidence increases between 25 and 55 years and is the most common type of chronic inflammatory arthritis . It affects joints bilaterally with synovial hyperplasia, cartilage erosion, bone destruction, and progressive loss of function . also characterized by systemic features and joint involvement. It can lead to significant morbidity and mortality so early diagnosis and proper treatment are crucial in decreasing the burden of this disease . According to the World Health Organization mortality database of 31 countries, RA accounts for almost 18% of all deaths caused by different types of arthritis and other musculoskeletal diseases, but the exact cause of RA remains unknown
Vitamin D level and its association with disease activity in Egyptian Rheumatoid arthritis (RA) patients