The most likely cause of constipation is lumpy stools, and there are many reasons for constipation. Pathological constipation, there are many diseases that can cause constipation, such as hypothyroidism, etc. If you have a partial diet, such as eating less coarse grains such as cornmeal, or do not eat coarse grains will appear lumpy stools. If there is little exercise and less bowel movement, there is also a possibility of lumpy stools. The poor defecation habits, many people are busy with the intention of stool, but also hold back, the rectal nerve response will be reduced over time, will also lead to dry stool lumpy stool. Gastrointestinal diseases, such as gastritis, gastric ulcer, enteritis, duodenal ulcer, will affect the gastrointestinal function, gastrointestinal peristalsis will be abnormal, it may lead to constipation, the stool will accumulate in the intestines, the water is constantly absorbed by the intestines will become dry, the stool lumpy.