Please consider that it may not relate at all to ME and that one person can have multiple concurrent issues that happen at once, overlap, but may not link at all to ME.I am yet to figure out how this links with the ME/CFS.
Here are a few conditions that are not related to ME but may occur concurrently: cancer, osteoarthritis, osteoporosis (which can be due to inactivity and lack of weight bearing activity, granted), frequent bladder infections, kidney stones, rheumatoid arthritis, lupus, Parkinson's, depression, diabetes, heart disease, pancreatitis, Crohns ... just to name a few.
I would agree that the concurrent diseases can interplay in feeling extra miserable. However I would not say that ME causes everything downstream.