– withdrawal from friends, family and colleagues
– avoidance of activities they normally enjoy
– sleeping too much or too little
– eating too much or too little
– having a feeling of hopelessness
– always have low energy
– use mood-altering substances such as alcohol and nicotine more frequently
– show negative emotions
– be confused
– be unable to perform everyday activities, such as going to work or preparing meals
– having persistent thoughts or memories that recur regularly
– thinking about harming themselves or others
– hear voices
– have delusional ideas.