This topic is about a person who usually irrigates their colostomy but is now experiencing a problem where it feels like the stoma is "closing up," making it difficult for water to enter. They are seeking possible reasons and solutions for this issue. Here are some insights and advice that might help:

1. Consider muscle (peristalsis) blockage:
- Sometimes, the internal muscle of the stoma can shift over the opening, blocking the cone and even trapping gas.
- One approach is to gently dilate the stoma by inserting a lubricated finger and applying steady pressure until the muscle relaxes. Then, insert the irrigation cone while maintaining firm pressure to prevent it from being pushed out too soon.
- This technique can also be used when inserting stoma plugs to help the muscle gradually learn to stay open.

2. Try a DIY device to "train" the muscle and vent gas:
- A plastic nasal inhaler case, with its outer and inner parts screwed together, can be used as a finger-sized tool.
- Drill multiple smooth, countersunk holes in the tip and sides to allow gas to escape, as a single end hole might get sealed by the muscle.
- Thread two wires through the outer end to attach an adjustable waistband, which helps keep the device in place long enough for the muscle to relax.
- This method has been successful for some, but it requires personal adjustments and should be approached with caution.

3. Address hernia-related narrowing:
- A parastomal hernia can sometimes kink or compress the bowel, blocking water flow.
- Gently supporting or pushing the hernia inward by hand until the initial water flow starts can help. Once the flow begins, irrigation usually proceeds normally.

4. General cautions:
- Always seek guidance from a medical professional or ostomy nurse before trying digital dilation or homemade devices, as what works for one person may not be safe for another.
- Scar tissue from previous hernia surgery can also cause stiffening or narrowing, so a professional assessment is important.