Is it normal to have period just for one day?

Menstrual Cycle: Women's menstrual cycles can vary in length for a variety of reasons. Small changes in your cycle does not necessarily mean that something is wrong. Stress, weight changes, breastfeeding, medications and menopause can all contribute to changing cycle lengths. Your period may be very short one month (as little as 1 day) and much longer the next. An OBGYN can help you understand your situation.