irritability

Over the past few months I find myself very short tempered and getting irritable with the least amount of stimuli. This is completely out of character for me and how do I change this? I realize that I am doing it and can't help the way I feel. Otherwise, I feel good and happy, no other signs of depression or any other symptoms. What do you think is going on?
I don't feel extra stress, and things are good with my family and work. I just don't understand my change with my patience lately.

There must be some cause for this. Discuss the problem with a psychiatrist.