Can ssri alone treat the depression with bipolar 2? or is something else always necessary to treat just the depression?

More to it: An ssri alone is not the treatment of choice because it can precipitate a manic or hypomanic episode. Most psychiatrists would combine it with a mood stabilizer or consider a different class of medication in order to avoid that. Bipolar ii is over-diagnosed. I can't offer an opinion about you, but many people who get the diagnosis are not bipolar, and the depression responds to psychotherapy.

Inconclusive: General standard of care is to avoid antidepressants alone for the treatment of bipolar spectrum illness due to the potential to worse the course of illness. Some evidence suggests this may not be as problematic regarding bipolar disorder type 2 compared to type 1.