LOS ANGELES: Oscar-winner Catherine Zeta-Jones on Monday headed back into treatment for bipolar disorder. “Catherine has proactively checked into a health care facility,” her spokeswoman said. “Previously Catherine has said that she is committed to periodic care in order to manage her health in an optimum manner,” she added. Zeta-Jones started a 30-day treatment on Monday. The actress said in 2011 that she has bipolar disorder, or manic depression, a mood disorder in which euphoric states can alternate with severe depression. The Welsh actress won an Academy Award in 2003 for her supporting role in “Chicago”–AFP