Feb 15, · Bipolar Disorder What Bipolar Disorder Looks Like in Adults Learn the most common symptoms of bipolar disorder in adults, as well as warning signs that may present at home or at work. Author: Devon Frye. Feb 13, · Bipolar disorder is a mental illness marked by extreme changes in mood from high to low, and from low to high. Highs are periods of mania, while lows are periods of depression. The .