Hello, Thanks for writing to us. Your sister is suffering from polyarthitis, the cause of this might be Rheumatoid arthritis (RA), systemic lupus erythematosus (lupus), psoriatic arthritis, osteoarthritis (OA), Infectious arthritis or crystal deposition arthritis. I would suggest getting this evaluated by an orthopedician/Rheuatologist for an accurate diagnosis and appropriate management. I would also like to give some advice to make the life better and to fight with these pains- Do regular physiotherapy of joints. Hot fomentation to decrease the joint stiffness Hot bath of Epsom salts (magnesium sulphate)-Magnesium has both anti-inflammatory and anti- arthritic properties and it can be absorbed through the skin. Wishing you good health... Regards. Dr Saurabh Gupta.