Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).
Even though 85 percent of kidney stones are small enough to pass during urination, fewer than 50 percent of patients chose this option. A person with a normal-size ureter can usually pass a kidney stone with a diameter less than 5 mm (about 3/16 of an inch) without significant pain or risk of kidney damage.
According to U.S. News, recommendations for the waiting period to pass a kidney stone include consuming at least 3 quarts of water per day, staying physically active, using pain medication prescribed by a physician, urinating through a strainer to retrieve the stone, and seeking out medical attention if worsening symptoms occur.