Bipolar disorder is a mood disorder characterized by periods of mania and depression. It can be diagnosed at any age but typically emerges in teens and early twenties. There are three main types: bipolar I, bipolar II, and mixed bipolar. Bipolar disorder in children tends to involve rapid cycling between mood states and behavioral issues like irritability and tantrums. The cause is unknown but believed to involve genetic and environmental factors. Treatment involves medication, therapy, and lifestyle changes. School accommodations for children with bipolar disorder may include preferential seating, scheduled breaks, and individualized scheduling.