Majority of the women complain about body pain, stomach ache, weight gain, anxiety, depression, etc. before the onset of their monthly cycle. They know that they are feeling and thinking differently, but have no control over these changes. However, during this period of time, they not only undergo physical changes, but also experience emotional and behavioural changes. These changes culminate into a series of symptoms and their severity can affect quality of life by interfering with the routine activities, interpersonal relations or social life. This overall phenomenon is termed as Premenstrual Syndrome (PMS). This article briefly explains about this condition, its symptoms as well as the causes and risk factors behind it.