18-year-old menopause 2 months reasons are as follows: 1, diet is too cold, resulting in endocrine disorders, causing menstrual disorders; 2, stay up late irregular life, endocrine disorders make menstruation delayed; 3, excessive mental stress, resulting in endocrine, ovarian dysfunction; 4, environmental changes make endocrine disorders, ovarian dysfunction; 5, poor nutrition, excessive weight loss, dieting, resulting in iron deficiency anemia; 6, do not pay attention to personal hygiene, resulting in gynecological inflammatory diseases occur, affecting endocrine, causing irregular menstruation; 7, need to exclude pregnancy.