What connections are there between hypothyroidism and sinus problems?

My son has been diagnosed with HSP and, as a result, kidney disease. It is believed that some autoimmune disorder is the cause. He takes prednisone and still suffers illness from coughing and sinus congestion. I have hypothyroidism and was wondering if this might be the cause for his problems as well. His thyroid tests came back on the low side of normal range which mine did as well. They treated me anyway. Please help.
Please note that I do not feel that my hypothyroidism is like a virus attacking his body. I want to know if he might have hypothyroidism. I know that my condition is not contagious.