Before having a colonoscopy, you need to drink laxatives to clear your bowels. If you drink a lot of water after taking the laxatives and cause an increase in urination but no bowel movement, it may be due to insufficient amount of laxatives or slow speed of taking the laxatives, or it may be due to the presence of underlying diseases, such as constipation, or the presence of intestinal tumors caused by incomplete intestinal obstruction. Generally speaking, the laxatives before colonoscopy need to be taken by the patient in divided doses, if the number of times taken is too small, the speed of taking them is slow, or they are not taken in accordance with the doctor’s dosage, they may cause the phenomenon of no bowel movement. In addition, for intestinal peristalsis is too slow, long-term persistent constipation patients, there may also be after drinking laxatives, still no bowel movement, at this time should be carried out exercise or massage in the abdomen to promote intestinal peristalsis and bowel discharge. Patients with underlying diseases are advised to seek prompt treatment. If through certain ways of intervention after drinking laxatives still no bowel movement, you need to go to the hospital in a timely manner, under the guidance of the doctor to clarify the specific causes, and carry out the appropriate treatment.