Thanks for writing in.
Your friend could be having anything from an infection to a autoimmune disorder to a malignancy. Parvovirus
remains a possibility but he should be having significant soreness in the joints.To narrow down the causes, we would need a couple of tests to start with. We would need a complete blood count
, a CRP and ESR
level, and a liver
Once we have the results, we can take it further from here.