Ileus: Symptoms, Causes and When to Consult an Online Doctor in the UK

Ileus, often referred to as paralytic ileus, is a digestive condition where the normal muscle contractions (peristalsis) that move food and waste through your intestines temporarily stop. Unlike a mechanical bowel obstruction, where a physical object like a tumour or scar tissue creates a blockage, ileus is a functional problem. The bowel is essentially 'asleep' or paralysed.

In the UK, ileus is most frequently seen in hospital settings following surgery, but it can also occur in the community due to infections, metabolic issues, or the use of specific medications. Understanding the difference between a temporary slowdown and a serious blockage is essential for managing your digestive health.

The symptoms of ileus can be uncomfortable and distressing. Because waste cannot move through the system, it begins to back up, leading to a range of gastrointestinal issues. Common signs include:

• Abdominal Bloating: A visible swelling or feeling of fullness in the stomach area (distension).
• Nausea and Vomiting: Often occurring because the stomach cannot empty downwards.
• Constipation: An inability to pass stool or difficulty doing so.
• Inability to Pass Gas: One of the hallmark signs that the bowel is not functioning correctly.
• Cramping: Mild to moderate abdominal discomfort, though usually less severe than the sharp pains of a mechanical obstruction.
• Loss of Appetite: Feeling full very quickly or having a total lack of desire to eat.

There are several reasons why the bowel might stop moving. In the UK, medical professionals categorise these into several groups based on clinical evidence and NICE (National Institute for Health and Care Excellence) observations:

Postoperative Ileus

This is the most common form. Significant abdominal or pelvic surgery often temporarily halts bowel function. The combination of handling the intestines during surgery and the effects of general anaesthesia typically causes the gut to 'shut down' for 24 to 72 hours.

Medication Side Effects

Certain drugs are notorious for slowing down the gut. Opioid painkillers (such as morphine, codeine, or oxycodone), anticholinergic drugs, and some antidepressants can interfere with the signals that tell your intestines to contract.

Electrolyte Imbalances

Your muscles, including those in your gut, require a specific balance of minerals to work. Low levels of potassium (hypokalaemia) or magnesium can lead to ileus.

Infection and Inflammation

Conditions like peritonitis, appendicitis, or severe gastroenteritis can cause inflammation that leads to a reactive ileus, where the bowel stops moving in response to the nearby infection.

If you present with symptoms of ileus, a healthcare professional will typically start with a physical examination, listening for 'bowel sounds' using a stethoscope. In a healthy person, the gut makes frequent gurgling noises; in someone with ileus, these sounds are faint or entirely absent.

Following a clinical assessment, further investigations may involve:

• Blood Tests: To check for infection markers and electrolyte levels (sodium, potassium, and magnesium).
• Abdominal X-ray: To look for dilated loops of bowel and signs of trapped gas.
• CT Scan: This is the gold standard for distinguishing between a functional ileus and a mechanical obstruction that might require surgery.

Treatment for ileus focuses on managing the symptoms while waiting for the bowel to regain its rhythm. Under NHS protocols, this usually involves:

'Drip and Suck'

This traditional clinical approach involves an intravenous drip to keep the patient hydrated and, if vomiting is severe, a nasogastric (NG) tube inserted through the nose into the stomach to suction out excess fluid and air, relieving pressure.

Medication Review

If medications like opioids are the cause, a GP or hospital doctor will look to reduce the dose or switch to alternative pain relief that is less restrictive on the gut.

Mobility and Nutrition

Patients are encouraged to walk as soon as possible after surgery, as physical movement can stimulate the gut. In some cases, chewing gum is recommended, as the act of chewing can trick the body into starting the digestive process (sham feeding).

While acute ileus is often managed in a hospital, many patients experience a 'slow' or 'sluggish' bowel during recovery at home or as a side effect of long-term medication. Speaking to an online GP can be a convenient way to manage these concerns.

You should book an online consultation if:

• You are recovering from surgery and your bowel movements haven't returned to a normal pattern.
• You are taking new medications and have noticed significant abdominal bloating and constipation.
• You need advice on lifestyle changes or over-the-counter options to support gut motility.
• You require a sick note for work while recovering from a digestive flare-up.

An online doctor can review your history, offer evidence-based advice on diet and hydration, and determine if you need to be referred for further diagnostic imaging or an in-person physical examination.