Stool with grooves but no blood in the stool in winter pain may be related to dietary factors, gastrointestinal diseases, anal and intestinal diseases and other conditions. 1. Dietary factors: If you eat cold and irritating food in winter, it may cause intestinal stimulation, affecting the normal digestive function, and the patient may have unformed stools, abdominal pain and diarrhea. 2. Gastrointestinal diseases: If the patient has gastrointestinal diseases in winter, such as gastrointestinal ulcers caused by bacterial infections and gastrointestinal inflammation, the patient will experience abdominal pain, diarrhea, and change in the shape of the stool and other phenomena. 3. anal and intestinal diseases: if the patient has internal hemorrhoids, external hemorrhoids, intestinal polyps and other diseases, due to the obstruction of stool in the discharge of the anus, will lead to the phenomenon of stool with a groove. There is a groove in the stool but winter pain without blood in the stool is also seen in other reasons, it is recommended that patients seek medical attention in a timely manner, under the guidance of a professional doctor to standardize the treatment, so as not to delay the condition.