Does having grooves in the stool always indicate a medical problem?

In general, grooves in the stool do not necessarily indicate disease. The specific analysis is as follows:

Grooves in the stool may be caused by various factors. They could result from benign intestinal conditions. For example, large internal hemorrhoids may compress the stool during defecation, causing grooves to form. Similarly, if an intestinal polyp is relatively large and located near the center of the intestinal lumen, it may also affect stool shape to some extent, leading to grooving. However, grooved stool can also be a sign of more serious conditions, such as intestinal tumors—particularly rectal tumors. As a tumor grows, it may occupy space within the intestinal lumen, compressing the stool as it passes and causing it to become grooved or narrowed. Nevertheless, the presence of grooves in the stool alone is insufficient to diagnose any disease. Additionally, dietary factors may sometimes influence stool shape. Consuming large amounts of high-fiber but hard-to-digest foods recently, or experiencing temporary disturbances in intestinal motility, may also alter stool shape, resulting in groove-like appearances. However, such changes are usually temporary and not accompanied by other abnormal symptoms.

It is advisable to maintain healthy eating habits, drink adequate fluids, undergo regular medical check-ups, and stay attentive to bodily changes. Engaging in moderate physical activity, such as walking, jogging, or yoga, can also help enhance intestinal motility.