When you were a teenager, you might have kept a diary hidden beneath your mattress. It became your confidant and a place to confess your struggles and fears without judgment or punishment. It probably felt good to get all of those thoughts and emotions out of your head and down on paper. The world seemed clearer. Although you may have ditched the diary once you reached adulthood, the concept and its benefits still apply. Now it’s called journaling. It's simply writing down your thoughts and feelings to understand them more clearly. And if you struggle with stress, depression, or anxiety, keeping a journal can help you gain control of your emotions and improve your mental health.