Persistent irritability can be a symptom of depression. Typically when we think of depression we tend to consider first the classic symptoms of depression such as low mood and motivation, changes to our sleeping and eating habits, etc., yet irritability can be an indication that you are depressed; especially if it is persistent. This can be especially true for men, who may not show the visible signs of emotion linked to depression; the same goes for children or adolescents who may act out behaviourally as an indication that something is wrong. In any case, if depressive symptoms are interfering with the day-to-day functioning of your life, a proper diagnosis is important.
For more information about the symptoms and treatment of depression: http://depressionhurts.ca/en/
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