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.
Causes of bowel incontinence. Bowel incontinence is usually caused by a physical problem with the parts of the body that control the bowel. These problems are explained in more detail below. It's important to discuss any bowel problems with your GP as there's a small chance they could be a sign of a more serious condition, such as bowel cancer.