How is premenstrual syndrome (PMS) defined?

• A. At least one emotional or physical symptom causing severe distress during the luteal phase.
• B. Absence of menses during the luteal phase
• C. Painful menses only
• D. Mood improvement before menses

Answer: (A)

Premenstrual syndrome is defined by showing at least one emotional or physical symptom that causes noticeable distress during the luteal phase of the cycle. The luteal phase is the time after ovulation and before the next period, when hormonal changes can trigger cyclical symptoms such as irritability, mood swings, bloating, breast tenderness, or headaches. The key idea is that these symptoms occur in the latter half of the cycle and are significant enough to disrupt daily functioning, not just occasional discomfort. They typically ease once menses begins, which helps distinguish PMS from other conditions.

This makes the chosen definition the best fit because it directly ties the symptoms to the luteal phase and to the distress they cause, capturing the essence of PMS. The other options describe conditions that aren’t PMS—absence of menses during this window points to problems like anovulation or pregnancy, painful menses describes dysmenorrhea, and mood improvement before menses contradicts the typical mood-related symptoms seen in PMS.