How many days is a normal period before it's considered irregular? What are irregular periods?Most women have a menstrual cycle that lasts between four and seven days. Menstrual cycles typically occur every 28 days, but normal menstrual cycles can last between 21 and 35 days. In fact, the average cycle length is 29 days. Many factors cause irregular periods, such as changes in hormone levels, stress, certain medical conditions, medications, and more.
What are...
