my 6 year old son has been unwell with a chest infection and nasty cough, this seems to happen at least one week out of every month. i took him to the dr to have him examined as i also was concerned that my son was complaining of a sore lower abdomen when coughing, (not urinating) and a sore to touch upper back (lung area). the dr did a urine test which showed positive for blood, no infection present, he ordered a blood test and second urine test for FBE; ESR;E/LFTS - M/C/S; ANA; CRP;. i have also noticed his inguinal lymph nodes, Retroauricular lymph nodes, and Retroauricular lymph nodes appear inflamed. what in your opinion are the concerning factors regarding the information i have provided.