Why can't I hold it after using a glycerin suppository, and what should I do?

Under normal circumstances, the urge to defecate immediately after using a glycerin enema (suppository) may be caused by drug effects, increased sensitivity of the rectal mucosa, chronic constipation, anal sphincter dysfunction, or ulcerative colitis. It is recommended that patients promptly visit a hospital to determine the underlying cause and follow medical advice for treatment. Specific analyses are as follows:

1. Drug effect: After the glycerin enema is administered, it rapidly draws water from the intestinal wall tissues into the intestinal lumen, increasing fecal moisture content and making stool easier to pass. This physical stimulation and lubrication effect quickly trigger a strong urge to defecate, causing patients to feel unable to hold it in. Patients may try diverting their attention—for example, by listening to music or changing body positions—but should avoid prolonged squatting.

2. Increased rectal mucosal sensitivity: Some individuals have particularly sensitive rectal mucosa. When the lubricating components of the glycerin enema stimulate this sensitive tissue, a strong defecation urge occurs. Patients can adjust their diet to improve gut health and reduce dependence on glycerin enemas.

3. Chronic constipation: In patients with chronic constipation due to poor dietary or lifestyle habits, accumulated feces in the intestines reduce the bowel's adaptability to stimuli. When a glycerin enema is used, the sudden stimulation accelerates intestinal motility, resulting in an intense urge to defecate. In such cases, patients may follow medical advice to use medications such as senna granules, bisacodyl enteric-coated tablets, or smectite powder for treatment.

4. Anal sphincter dysfunction: Long-term defecation problems, hemorrhoids, rectal prolapse, and similar conditions can impair the function of the anal sphincter, weakening its coordination during bowel movements and leading to uncontrollable urges to defecate. Under medical guidance, patients may use medications such as nifedipine sustained-release tablets, isosorbide dinitrate tablets, or mesalazine enteric-coated tablets to aid treatment.

5. Ulcerative colitis: Ulcerative colitis is associated with environmental, genetic, gut microbiota, and immune factors. Inflammation damages the intestinal mucosal barrier, increasing sensitivity to stimulation from glycerin enemas and causing an uncontrollable urge to defecate, often accompanied by symptoms such as abdominal pain, diarrhea, and bloody stools. As directed by a physician, medications such as methylprednisolone tablets, enteritis-relieving capsules, or live bacterial preparations like Bacillus subtilis and Clostridium butyricum may be used to relieve symptoms.

In daily life, improving intestinal function and reducing constipation can be achieved through dietary changes, including increasing dietary fiber intake, drinking more water, and engaging in appropriate physical activity.