 [ Symptoms ] how long does imodium stay in your system due to the type of colon surgery i had i have chronic diarrhea sometimes i was told i could take imodium prior to going out to meet friends for the day as a cautionary measure  how long does imodium stay in your system [ Disease ] yes some women do experience spotting with heavy exercise this can represent either a less stable lining of the uterus or polypsfibroids let is look at both possibilities an unstable lining of the uterus can arise from hormonal forms of birth control e g pillspatchringshot it can also happen if the woman has an overly thickened uterine lining a too thick lining can develop if the woman is missing ovulations is perimenopausal andor is very heavy set classically a too thick lining will also suggest itself if there are erratic or very heavy menstrual periods the presence of uterine fibroids or polyps of the uterine lining can also make a normal sized lining be easier to have spotting classically there may be spotting between periods or after intercourse bottom line if the spotting persists or increases you should see your gyn or local family planning clinic for follow up there is no overt reason for you to stop your planned running  unless it prompts increased bleeding