First of all, you should have a good attitude, optimistic attitude towards life, which will help improve your immune function and enhance your ability to resist diseases. Second, to have good habits, to maintain adequate sleep, early to bed and early to rise, eat less and more meals, comprehensive and balanced nutrition, eat more fruits and vegetables. Third: combine work and rest, moderate exercise, to not strain, avoid colds, if there is a primary disease, such as hypertension, diabetes, to control.