My 17.5 yo son had Henoch-Schonlein Purpura (HSP) 3.5 years ago. 2 weeks ago he had a cold and immediately afterwards developed severe joint pain, so bad he can hardly walk & occasionally abdominal pain & nausea. no rash.
Is it possible that this is a recurrence of hsp without the rash? How can we check out what’s going on?
Blood test seems normal, no blood in urine. protein in urine is 10 mg/dl.
Will appreciate your advice. Thanks a lot.