Constipation is a feces and droppings symptom involving the abnormally delayed or infrequent passage of dry hardened feces. Constipation may be categorized into three subtypes: normal-transit, slow-transit, and pelvic floor dysfunction. [ url:http://www2.merriam-webster.com/cgi-bin/mwmednlm?book=Medical&va=constipation url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3170709/ ]