possable RA ?

painful knees on the inside of my knee caps where the bone is its tender , they burn sometims , after sitting and getting up they feel stiff and very painful , same with sometimes at night and in the morning after getting up out of bed . when i walk around for more than 20 mins in a store they start to be very painful and it hurts to walk . i also noticed sometimes when i get really cold my knees ,wrist and sometimes my elbow ache . but its mostly my wrists and knees . i do beleive my mother may have rheumatoid arthritis ,(bone and joint disease) dunno if both are connected meaning if the same . anyways i was wondering if anyone else has these symptoms and if so what causes it ? i know i should make a docts apt . but i just wanna know what i may be dealing with before i go .....

thank you ,ladybelle31