A modality is the way or mode in which something exists or is done. You might often see it used with reference to diagnostic modality, which is the way in which a disease or illness is diagnosed by a doctor. Modality shares its root with the word mode, meaning the way in which something happens or is experienced.. A sensory modality is a way of sensing, like vision or hearing. Modality in someone's voice gives a sense of the person's mood.
Some of the causes of slow bowel movements, whether clearly defined as constipation or not, includes 1  : Dehydration. 2  Depression. 3  Eating disorders.  Hypothyroidism â underactivity of the thyroid 1  gland. Hemorrhoids.  Inflammatory bowel disease (IBD) â active phases always present with diarrhea.
System Slowdown. Studies have shown that iron can slow down the digestive system. This can also contribute to slowing of normal bowel movement. This may be because iron is a metal in its basic form. Metals can carry a charge that is magnetic or electric, affecting muscles and nerves in the bowel.