Many people living with hydrocephalus and peritoneal shunts<\/a> will experience abdominal pain or pressure at some point.\u00a0 While it can feel alarming, this discomfort doesn\u2019t always mean there\u2019s a malfunction.<\/p>\n In many cases, the pain is related to normal abdominal issues unrelated to the shunt (such as constipation).\u00a0 Other times, the body has reacted to the shunt tubing in the abdomen wall and created scar tissue that is the cause of the problem.<\/p>\n Understanding the types and causes of abdominal issues can help you talk confidently with your care team and find strategies that bring relief.<\/p>\n It is important to define the pain or discomfort.<\/p>\n Focal pain or discomfort located at or very near the shunt insertion into the belly may be related to the tissues outside the belly cavity.<\/p>\n Generalized discomfort in the belly can have many causes.\u00a0 It is important to discuss the quality of the pain and the location.<\/p>\n The following are the most common causes of abdominal pain in patients with shunts:<\/p>\n Constipation is one of the most common and overlooked causes of abdominal pain for people with VP shunts. \u00a0It can develop without any symptoms, it can show up with difficulty in passing a stool, or if it causes the bowel to distend, that can cause bloating, fullness or a cramping sharp pain.\u00a0 It is often just a diffuse discomfort that is located more often on the left side of the abdomen.<\/p>\n When there is a lot of stool build up over a long time (days to weeks) it can increase your intra-abdominal pressure and might affect the function of a peritoneal shunt.\u00a0 If this happens, this pressure will mimic<\/em> or trigger<\/em> shunt-related symptoms such as headaches, nausea, or a sense of increased brain pressure. \u00a0In these cases, effectively treating the constipation will treat the symptoms.<\/p>\n Maintaining regular, soft bowel movements can significantly reduce both abdominal discomfort and these symptoms that can overlap with a shunt malfunction.<\/p>\n Over time, the body naturally forms scar tissue (fibrosis) around the shunt catheter. \u00a0Normally shunt tubing will slide freely inside the scar and you will not feel the tubing.\u00a0 Rarely, the scar tissue can attach to the shunt tubing and prevent that free motion and sliding.\u00a0 Then normal body movement causes the tubing to pull on the adjacent tissues and that can cause localized\/focal pain at the site of scarring.<\/p>\n (This is more commonly seen where the shunt tubing crosses the base of the skull, across the clavicle, or along the chest wall.\u00a0 This can cause discomfort described as a soreness, tightness, or a tender feeling along the tubing, made worse with movement or touch).<\/p>\n Sometimes the scar at the entrance to the belly becomes quite thick or twisted, and movement will result in pain that is usually very localized to the area right around the scar.\u00a0 Often that scar is distorted and seems to be \u2018pulled\u2019.<\/p>\n In all of these cases, the cerebrospinal fluid (CSF) continues to flow normally within the shunt.<\/p>\n The treatment usually requires a shunt surgery to reposition or replace the tubing in those areas, and the only goal is to resolve the pain.<\/p>\n The peritoneum \u2014 the inside thin lining of the abdominal cavity \u2014 can become painful if it is irritated.\u00a0 The pain can be localized to one area, or generalized all around the belly.\u00a0 It can be quite severe.<\/p>\n It is almost always is due to an infection.\u00a0 In patients with peritoneal shunts, the most common cause of a peritoneal infection is after a surgical shunt revision; it can show up days to weeks after the surgery.<\/p>\n With peritonitis, the shunt is usually working but the inflammation can cause poor absorption of the CSF being deposited there by shunt.\u00a0 The inflammation may cause the fluid to be walled off (\u2018pseudocyst<\/a>\u2019) causing discomfort or fullness but not much pain, and slowly developing signs of shunt malfunction.<\/p>\n Multiple intra-abdominal surgeries may lead to internal scar tissue forming between the organs and intestines – called adhesions. These fibrous bands can cause organs and tissues to stick together.\u00a0 This can cause blockage of the intestines, or sometimes restrict the movement of the shunt catheter and forming trapped fluid and acting like a shunt obstruction.<\/p>\n These adhesions form weeks to years after the abdominal surgery and usually develop slowly \u2013 although a bowel obstruction they cause can show up suddenly.<\/p>\n If there is a defect in the abdomen wall \u2013 by the belly button, in the groin (inguinal), or at the site of shunt tubing insertion, then the peritoneum can push through and be trapped causing pain.<\/p>\n These conditions are usually obvious to a physician, but may require imaging such as ultrasound or CT for diagnosis.\u00a0 They are usually easily treated once identified.<\/p>\n Pain doesn\u2019t always mean a shunt malfunction.<\/strong><\/p>\n Mild abdominal pain or tenderness may come from:<\/p>\n But call your neurosurgeon right away if you notice:<\/strong><\/p>\n Remember:<\/strong> You know your body best. If something feels off, reach out to your doctor. Your care team can help determine what\u2019s normal and what needs attention.<\/div><\/div>\n Open communication with your neurosurgeon or gastroenterologist is key. Describe where the pain is located, what it feels like, and what makes it better or worse. Sometimes simple adjustments, better bowel management, or reassurance that the shunt is functioning can ease anxiety and symptoms.<\/p>\n You know your body best. If something feels different or concerning, trust your instincts and reach out. You\u2019re not alone in navigating this.<\/p>\n Watch:<\/strong> Abdominal Pain and Shunt Irritation Discussion<\/a> Abdominal pain or pressure related to a shunt can be frustrating, but it\u2019s often manageable and not always a sign of malfunction. By understanding the common causes, staying proactive about constipation and pressure changes, and tracking when symptoms occur, you can help prevent flare-ups. Partnering closely with your neurosurgeon or gastroenterologist ensures you can find lasting relief and maintain confidence in your shunt health.<\/p>\n Information you can trust! This article was produced by the Hydrocephalus Association, copyright 2025. We would like to thank\u00a0Bruce A. Kaufman, MD<\/a> for his valuable contribution and expert input.<\/em><\/p>\n This article is designed to provide helpful information on the subjects discussed. It is not intended as a substitute for treatment advice from a medical professional. For diagnosis or treatment of any medical condition, consult your doctor.<\/i><\/em><\/p>\n\r\n
\nTypes of Pain and Discomfort<\/h2>\n
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\nCommon Causes of Abdominal Pain and Pressure<\/h2>\n
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\nPractical Tips for Managing Discomfort<\/h2>\n
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\nNext Steps: Talking with Your Care Team<\/h2>\n
\nLearn More<\/h2>\n
\nExplore:<\/strong> Complications of Shunt Systems<\/a>
\nRelated Reading:<\/strong><\/p>\n\n
\nManaging Abdominal Pain and Protecting Your Shunt Health<\/h2>\n
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