This web site was developed to help patients, physicians, and PET imaging providers learn how PET imaging is used for various types of disease; primarily in detecting, staging and monitoring cancer, but also in heart disease and brain disorders.
If your period is heavy enough to require changing it more often than every one or two hours, or if you have a period that lasts more than a full week, you may have heavy menstrual periods.n fact, many women begin to experience heavy and/or irregular bleeding in their 30s and 40s. Keep in mind it is common for periods to vary in duration and flow, and normal periods can vary from one woman to the next. But the easiest way to gauge your periods is to ask yourself how often you change your pad or tampon.
1 Age. 2  When teens first start having periods, their menstrual cycles may not always be on the same schedule every month. 3  It may take several years to settle into a pattern. 4  In addition, missed periods and lighter or heavier periods are common as women near menopause. normal menstrual cycle lasts 28 days, plus or minus seven days. Menstrual bleeding is considered irregular if it occurs more frequently than every 21 days or lasts longer than 8 days. Missed, early, or late periods are also considered signs of an irregular cycle.