There are numerous synonyms you can use for the phrase "minor trouble" depending on the context they are used. Some of the alternatives that you can utilize includes petty problem, trivial snag, small concern, insignificant issue, minor hurdle, unimportant complication, meager obstacle, and small hitch amongst others. The term minor trouble implies that the issue at hand is not significant enough to be a source of significant concern, yet requires attention to be resolved effectively. By using such synonyms, you can paint a clearer picture of the type of problem your dealing with, and give the reader a better understanding of how easy or challenging the issue might be to solve.