I do have the occasional patient who complains that one side was more uncomfortable than the other. It could be that the injection was near a blood vessel, which is usually more sensitive. Also, the nasolabial fold in the nasal area is always a bit more tender during injections. It certainly was NOT due to septum or sinus issues. You may or may not experience the same issues the next time you're injected, but the good news is there's nothing to worry about.