A sign of a girl's period.

The symptoms a woman presents before her period are premenstrual syndrome. A syndrome characterized by recurrent periods and emotional and physical disturbances during the luteal phase that disappear naturally after menstruation. Specific manifestations: Physical symptoms include headache, back pain, breast tenderness, abdominal fullness, constipation, limb edema, weight gain, and decreased motor coordination. Mental symptoms include irritability, anxiety, depression, emotional instability, fatigue, and changes in diet, sleep, and libido, with irritability as the main symptom.