In bright light, the pupil constricts to reduce the amount of light entering the eye. In dark or dim light, the pupil dilates to allow more light into the eye to improve vision. Normal pupil size tends to range between 2.0 and 5.0 millimeters, depending on the lighting. The younger you are, the larger your pupils tend to be.
Fecal incontinence is commonly caused by altered bowel habits (generally diarrhea, but also constipation) and conditions that affect the ability of the rectum and anus to hold stool. The sphincter muscles become weaker as you grow older.
Incontinence may be: 1  Temporary or Acute: Some causes are childbirth, mobility that is limited, medication side effects or urinary tract infections. 2  Chronic: Can be caused by, birth defects, bladder muscle weakness, prostate tumors or enlargement, brain and or spinal cord injury, nerve disorders and pelvic floor muscles weakness.