Menstrual pain and allied conditions. Menstrual pain (dysmenorrhoea) refers to the pain experienced during the monthly period. It can vary in intensity from month to month and may occur intermittently. Always seek professional advice if pain is severe or there is doubt/anxiety that there is a possible organic cause for the pain, or there is excessive blood flow or clotting. Combination N causes no side effects and so can be taken with confidence by menstruating women of all ages.