Cutar bipolar, wanda a baya aka sani da manic depression, cuta ce ta tabin hankali da ke da alaƙa da lokuttan baƙin ciki da haɓakar yanayi mara kyau. Idan yanayin haɓaka yana da tsanani ko kuma yana hade da psychosis, ana kiran shi mania; idan ya yi rauni, ana kiran shi hypomania. A lokacin mania, mutum yana nuna hali ko yana jin kuzari, farin ciki, ko fushi. Mutane da yawa sukan yanke shawara ba tare da la'akari da sakamakon ba. Yawancin lokaci ana samun raguwar buƙatun barci yayin matakan manic. A cikin lokutan baƙin ciki, mutane na iya fuskantar kuka, mummunan ra'ayi game da rayuwa, da rashin kula da ido da wasu. Hadarin kashe kansa yana da yawa; A cikin shekaru 20 6% na mutane sun mutu ta hanyar kashe kansu, yayin da 30-40% suka tsunduma cikin cutar da kansu. Wasu al'amurran kiwon lafiya na tabin hankali, irin su rikice-rikicen tashin hankali da rikice-rikicen amfani da kayan abu, galibi suna da alaƙa da cutar bipolar. Duk da yake ba a fahimce abubuwan da ke haifar da ciwon bipolar ba a fili, ana tunanin abubuwan muhalli da na halitta suna taka rawa.