A week ago I woke up with a burning pain under my ribs on the left side. Three days later a rash appeared on my back, left side. I went to urgent care on Tuesday, thinking I was bitten by a bug. I was diagnosed with Shingles. The pain remains under my ribs on the left side. I assume it s part of the Shingles diagnosis, since I m able to eat and all bodily functions seem good. I also assume I will have tenderness and pain for at least a month. I am on an antiviral medication. Maybe it s the medication causing the what feels like stomach discomfort? I am 63 and in good health, except for fibromyalgia for which no medication is taken.