<em>Answer:</em>
<em>bipolar disorder. </em>
<em>Explanation:</em>
<em>In psychology,</em><em> bipolar disorder is also referred to as 'manic depression' and 'manic-depressive illness'. It is described as one of the several mental disorders that often lead to unusual and unnecessary shifts of concentration, mood, activity levels, energy, and the capability of a person to carry out everyday tasks. </em>
<em>Symptom:</em><em> Mania, mood swing, etc.</em>
<em>Treatment:</em><em> Psychotherapy.</em>
<em>As per the question above, the statement represents the 'bipolar disorder'.</em>