Is It Just Mood Swings or Bipolar Disorder? Treatment Insights We all feel happy one moment and low the next — that’s normal. But if your moods change quickly and deeply, and it affects your daily life, it might be more than just mood swings. It could be a sign of bipolar disorder. Mood swings are often caused by stress, lack of sleep, or changes in routine. They don’t usually last long. But bipolar disorder includes extreme highs (called mania) and deep lows (depression) that last for days or even weeks. You may feel very energetic, talk too fast, or struggle to sleep — then suddenly feel tired, sad, or hopeless. If you're unsure what you're dealing with, getting the right help is......See More