I will assume Type 1 D based on where this is posted.
Yes, I believe it is common for your body's insulin needs to vary, day by day, season by season, year by year etc...
Possibly an infection, or stress, or eating more than before, or exercising less than before, or put on a little weight and getting some insulin resistance..? I really don't mean to seem facetious but hard to say with so little info.
How old are you, how many years with D, how often do you test, what are your Fasting and Post-Prandial BGs like, what insulin(s) are you on, how much and how often?
