Symptoms of depression include loss of interest or even loss, pessimism about the future, helplessness, mental fatigue, decreased self-evaluation and suicidal thoughts. Depression should adhere to the principle of combining medication with psychological intervention. If you want to change your bad mood. You should take part in more aerobic exercise to strengthen your physique and relieve tension. Try to communicate with family and friends around you and express your thoughts and emotions instead of focusing on psychology. Go out of the house, attend more parties or group activities, and open your heart to the outside world. In addition, it is very important to cultivate your hobbies. Happiness requires learning. Go out more, exercise more, look at the problem from another angle, and learn to cultivate your ability to perceive happiness and happiness.