Hello there, First of all, a more detailed history regarding abdominal pain needs to be taken. If this pain is associated with food intake or has a timing, it could very well be an isolated diagnosis with no connection with other complaints. Also if he otherwise gets a sound sleep at night, it may not be serious. Yes sore joints is certainly a cause of concern. The number of joints involved, the duration of complaints, the areas involved will all help in treating the Arthritis. A differential diagnosis of JIA should be kept in mind. An eye check up should be followed by cosultation with a Pediatric Rheumatologist. Wishing your child a speedy recovery.