We all have our off days; we cant be bright and cheery all of the time. Most of the time, though, we are at least reasonably content providing things around us arent affecting our mood. There are numerous other reasons why we might be feeling irritable and one of those is that we are concussed. If you have recently taken a blow to the head and you are feeling irritable for no apparent reason, then it is recommended that you should speak with a doctor. Even if it turns out to be nothing it was still a good idea to get checked out just in case.