Long sigh is a normal physiological phenomenon, people in calm breathing for a period of time, involuntarily sigh, will have a very good role in promoting lung gas exchange. Spontaneous sighing occurs when people think too much or are bored in their hearts, mostly accompanied by a feeling of heavy pressure in front of the chest, but as long as the long sigh, the phenomenon of holding the breath will ease a lot, so feel very comfortable. Sighing is a bad habit, formed over time, generally do not yet know themselves, really aware of the meaning only to find themselves also so. Prevention of sighing after comfortable need: 1, long-term sighing, and gradually form a psychological implication, will make people become unpromising. So adjust your mind and face life positively and optimistically. 2, let the people around you think you have long-term doubts in your heart, so for each person, it is best to make adjustments and make yourself happy.