U.S. Rep. Jesse Jackson Jr. is being treated for bipolar disorder, the Mayo Clinic announced Monday.

The Rochester, Minn.-based clinic specified his condition as Bipolar II, which is defined as periodic episodes of depression and hypomania, a less serious form of mania.

“Congressman Jackson is responding well to the treatment and regaining his strength,” the clinic said in a statement.

Bipolar II is a treatable condition that affects parts of the brain controlling emotion, thought and drive and is likely caused “by a complex set of genetic and environmental factors,” the clinic said. The statement also mentioned that Jackson underwent weight loss surgery in 2004 and said such a surgery can change how the body absorbs foods and medications, among other things

His father, Reverend Jesse Jackson, wouldn't say much either about the diagnosis, remarking, "I'm glad he's getting the treatment he needs and is responding well," adding that "there's no timetable" for his recovery.