In most cases, the occasional leg clenching behavior of girls has relatively little impact on the body, perhaps muscle cramps, vulvar damage, etc., but long-term, frequent leg clenching, or leg clenching during menstruation may appear mental depression, menstrual disorders, inflammation of the pubic area and other bad effects, and even the potential for skeletal changes. 1, leg muscle cramps: leg clenching when the leg force, there may be muscle cramps The pain is usually transient and can be relieved within a short period of time; 2. Vulvar injury: When girls clip their legs, it may cause the vulvar skin and mucous membrane to break and bleed. If this happens, girls need to immediately stop leg clamping behavior, and keep the vulva clean, to avoid wound expansion, infection; 3, depression: girls long-term, frequent leg clamping may lead to reduced sleep quality at night, so that the daytime depression, mainly manifested as difficulty concentrating, mental laxity, easy to sleepy, memory loss, or will affect daily work life; 4, menstrual disorders: if girls in the period of leg clamping. May lead to increased menstruation, prolonged periods, in serious cases may lead to menstrual disorders; 5, inflammation of the pubic: girls clip legs, the pubic can not form a normal air flow, easy to catalyze the breeding of bacteria, may appear inflammation of the pubic, such as vulvodynia, vaginitis, mainly manifested as pubic redness, pain, itching, leucorrhea abnormalities, increased secretions; 6, bone changes: if the girl is in the growth and development period. Long-term, frequent leg clenching has a certain probability of affecting the growth and development of bones, which may cause some abnormal changes.