If a person with marked highs and lows gets too involved with depressing politics or scary or sad this'n'that, or doesn't gather a tool box of self-soothing thoughts and behaviors (breathing, walking, sending birthday cards and thank you cards to other people, singing, playing sports—different sets for different people, but some positive, uplifting habits), the low can turn to a depression that isn't easy to rise out of, and can be nearly impossible to function from.
photo by Linda Wyatt