Hi, welcome to our site. I am Dr Saumya Mittal. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query There are several aspects of this answer 1. yes, in infections, sugars can rise if there is a severe infection. 2. in unknown diabetics, with high sugars, the infections are more common, and in fact many times the sugar is diagnosed due to the infection 3. in severe infections, sugars may also fall 4. sometimes in severe infection doctors may start steroids. and in that case sugars may spike. metronidazole is not known to cause high sugars I hope this helps you. Inform the reports mentioned above so i can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)