Bipolar II Disorder
Bipolar II gets misdiagnosed more often than Bipolar I, and the consequences are real. The hypomanic episodes are less severe than full mania, which makes them easier to overlook or rationalize. What tends to be more prominent is the depression, which is often longer-lasting and harder to shake than in Bipolar I. A lot of people with Bipolar II have spent years being treated for depression alone, which helps partially but misses the full picture.
Cyclothymic Disorder
Cyclothymia is the least talked about form of bipolar disorder, and it is also the easiest to dismiss. The mood shifts do not reach the intensity of full mania or depression, but they keep coming, consistently, for at least two years. Living with chronic low-grade instability wears on a person over time in ways not always visible from the outside. It also raises the risk of eventually developing Bipolar I or II, which is reason enough to take it seriously early.