I am 27 years old male with bmi 21 and I dont have any pain right now and in general also i don't have joint pains anywhere  but my RA factor is 20.6 IU/ml(positive) and anti CCP is 2.26 AU/ml (negative). my CRP, ANA and ASI are negative but ESR is 19mm/hr and hlab27 negative .  I did these tests because i had low back pain for 2 months and my uncle has ankylosing spondylitis hence to rule it out . Although the 2 doctors i met told me that my back pain is due to poor posture as it pains on movement and is not tender to touch and gave muscle relaxant which i think are working. Also my joints like knuckles neck and low back makes popping sound when i consiously crack them but without any pain. Questions - 1-do i have RA ?? 2- if not can i have RA later on in my life as i am RA factor positive ?? 3-do i need to worry about any other auto immune disease due to RA factor being 20.6 IU/ml and esr being 19mm/hr if its not rheumatoid arthritis