Bipolar disorder - where one minute you're happy as Larry and the next you're suicidal - is a well-diagnosed serious condition that requires mood-stabilising drugs. What the experts didn't know until recently is that 4% of the population suffers from the 'lite' version of the condition. This is when moods change by the hour. One minute the sufferer is cracking jokes, buying lunch for everyone and excelling at everything they do. The next, they're exhausted and looking through the classifieds. Neither mood is dangerous, but to a boss or colleague it can get pretty irritating. Treatment involves knowing what it is and how often it happens. Sufferers can either try to control a high with short-term medication or just enjoy the ride. Sadly, the high seldom lasts more than a few days.
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