I had right knee pain with swelling since last 1 year which often comes and goes automatically. Hardly it affected my daily activities.Again i had the same pain in my right knee for 2/3 days and suddenly i had heavy pain in night (07/01/2024) and with MRI it showed mild to moderate effusion , synovitis. The blood test results were ESR: 40 ,CRP: 58.9, ASO: negative, CBC: Negative. More to add i had the same right knee pain when i was 6-8 years old. since 2012 i had no symptoms at all. only my right knee is affected i am 19 years old currently. What kind of disease/arthritis is this? my doctor advised to aspirate the joint and i had to apply plaster for 21 days.