If the girl mood swings are relatively large, may be the following reasons: 1, personality factors, some girls are introverted, low self-esteem, sensitive, suspicious, while some people want to strong, perfectionist, easy to do things, this time it is easy to lead to temper tantrums, mood swings are relatively large, for their emotions difficult to self-control. If it is a personality factor, must be actively adjusted to properly establish a good outlook on life, values, while actively shaping a good character. 2, may be caused by psychological disorders, commonly depression, anxiety, depression, anxiety patients are prone to low mood, happy, as well as pessimism, negativity, low self-esteem, self-guilt, self-blame, or appear nervous, easily irritable, and always quiet and other symptoms. If there are these problems, it is easy to become irritable, difficult to control emotions, as well as easy to provoke and easy to quarrel with people, fights, etc. 3, may also be caused by physical diseases, such as hyperthyroidism, abnormal secretion of sex hormones, especially the problem of hyperthyroidism, patients are easy to appear temper, love to fire, difficult to control emotions, love to have arguments with people and other problems.