 Hi, I'm Dr. Sunil Kini working as a concert and orthopedic surgeon at Manipal Hospital's Bangalore Common causes of arthritis as it follows. The most common cause is osteoarthritis or age-related arthritis This is usually seen in elderly more than 50 to 55 years of age mainly related to wear and tear of daily use. Other causes of arthritis are inflammatory arthritis such as rheumatoid arthritis, psoriatic arthritis, systemic lupus erythromitosis which are all conditions which we see in the younger population of 2240 year age group and mainly related to inflammatory and genetic causes. The other forms of arthritis which is known are viral arthritis bacterial arthritis which can offer lead to septic arthritis and so on