经前综合症（Premenstrual syndrome，PMS），有时被称为经前紧张症（PMT），是在女性月经来潮之前一至二周出现的生理及心理相关症状 。症状因人而异，约在月经出现时结束 。常见症状包括粉刺、乳房压痛、腹胀、容易疲倦、易怒及情绪上的改变 。症状一般会持续六天。多数育龄妇女（约80%）都有一些经前综合征的症状，而美国家庭医生学将把经前综合症限定为具有“严重妨碍某些方面的生活功能”症状。同一位女性其经前综合症的症状或是出现的时间也会随时间而改变。在怀孕时或是更年期不会有经前综合症的症状。

Premenstrual syndrome (PMS) refers to physical and emotional symptoms that occur in the one to two weeks before a woman's period. Symptoms often vary between women and resolve around the start of bleeding. Common symptoms include acne, tender breasts, bloating, feeling tired, irritability, and mood changes. Often symptoms are present for around six days. A woman's pattern of symptoms may change over time. Symptoms do not occur during pregnancy or following menopause.