There are normal grief, pathological grief, and ambiguous grief, Bellotti continued. Normal grief lasts one to two years. In pathological grief, healing does not occur, and the bereaved cannot move ahead with his or her life. Ambiguous grief is where one is not sure whether a person is dead or not. "The swings between hope and grief are tumultuous," she said. It has been reported that the survivors of missing victims are at high risk for anxiety, depression, and psychosomatic symptoms, and the longer the possibility that a loved one is still alive, the greater the risk for psychopathology. But tolerance for such uncertainty varies, she said.