Dysmenorrhoea, or painful menstruation, is the most common problem affecting women of reproductive age. It can be primary, caused by increased prostaglandins during menstruation without underlying pelvic pathology, or secondary, caused by conditions like endometriosis, fibroids, or infection. Evaluation involves assessing pain severity and relationship to bleeding, as well as testing to rule out potential causes. Treatment of primary dysmenorrhoea focuses on NSAIDs, while secondary dysmenorrhoea requires treating the underlying condition.