Exocrine Pancreatic Insufficiency (EPI): Symptoms, Causes and UK Management

Exocrine Pancreatic Insufficiency, commonly referred to as EPI, is a functional digestive disorder occurring when the pancreas does not produce enough digestive enzymes. These enzymes—lipase, protease, and amylase—are essential for breaking down fats, proteins, and carbohydrates in the small intestine. Without them, the body cannot absorb vital nutrients, leading to malabsorption and malnutrition.

In the UK, EPI is most frequently associated with long-term damage to the pancreas, but it can also occur following surgery or in patients with certain genetic conditions. Because the symptoms often overlap with more common gut concerns like Irritable Bowel Syndrome (IBS) or Coeliac Disease, it can sometimes take time for patients to receive an accurate diagnosis. Understanding the specific signs is the first step toward effective management.

The hallmark of EPI is a change in bowel habits, specifically the development of steatorrhoea. However, the condition presents with a range of gastrointestinal disturbances that can significantly impact a person's quality of life.

• Steatorrhoea: Stools that are pale, oily, particularly foul-smelling, and difficult to flush. They may appear to float in the toilet bowl.
• Abdominal Pain: Persistent cramping or a heavy, dull ache in the upper abdomen, often worse after eating high-fat meals.
• Unintentional Weight Loss: Even if you are eating well, the inability to absorb calories and nutrients can lead to dropping pounds.
• Bloating and Excess Wind: Fermentation of undigested food in the gut leads to significant gas production.
• Nutrient Deficiencies: Signs of low Vitamin A, D, E, or K, such as bruised skin, brittle bones, or impaired night vision.

EPI is rarely a primary condition; it is almost always secondary to another health issue that has damaged the pancreatic tissue or blocked the flow of enzymes. According to NICE guidance, the most common causes include:

Chronic Pancreatitis

Long-term inflammation of the pancreas, often due to historical alcohol consumption, smoking, or autoimmune factors, is the leading cause of EPI in British adults. Over time, the healthy tissue is replaced by scar tissue, reducing enzyme production.

Cystic Fibrosis

In the UK, many children and young adults with cystic fibrosis develop EPI because thick mucus blocks the pancreatic ducts, preventing enzymes from reaching the intestine.

Pancreatic Surgery

If a portion of the pancreas has been removed (for example, due to a tumour or severe acute pancreatitis), the remaining organ may not be able to produce sufficient enzymes.

Diabetes

There is an increasing recognition that patients with long-standing Type 1 and sometimes Type 2 diabetes may develop mild to moderate EPI due to changes in the pancreatic architecture.

If you present with symptoms of malabsorption, a GP will typically begin by ruling out other conditions through blood and stool tests. The gold-standard non-invasive test for EPI in the UK is the Faecal Elastase-1 (FE-1) test. This involves providing a sample of formed stool to measure the concentration of elastase, an enzyme produced exclusively by the pancreas.

Result thresholds are generally as follows:

• Over 200 µg/g: Normal pancreatic function.
• 100–200 µg/g: Mild to moderate pancreatic insufficiency.
• Below 100 µg/g: Severe pancreatic insufficiency.

In some cases, imaging such as a CT scan or MRI (specifically an MRCP) may be required to look at the structure of the pancreas and identify underlying causes like chronic inflammation or stones.

The primary treatment for EPI is Pancreatic Enzyme Replacement Therapy (PERT). These medications contain a mixture of enzymes derived from porcine (pig) pancreas, designed to mimic the natural function of your own organ. In the UK, common brands include Creon, Nutrizym, and Pancrease HL.

For PERT to work effectively, it must be taken correctly: with every meal and snack. The enzymes should be swallowed at the beginning of the meal or spread throughout it. Because these enzymes are proteins, they are deactivated by stomach acid; therefore, the capsules are enteric-coated to ensure they reach the small intestine intact. Your doctor may also prescribe a proton pump inhibitor (PPI) to reduce stomach acid and improve the effectiveness of the therapy.

Alongside medication, a dietitian may suggest a diet that is sufficient in healthy fats and high in fat-soluble vitamins to counteract deficiencies. Restrictive low-fat diets are generally no longer recommended for EPI patients, as the goal is to successfully digest a normal, nutritious diet using PERT.

If you are experiencing persistent bloating, changes in your bowel habits, or unexplained weight loss, it is important to seek medical advice promptly. You can speak to a GP online in the UK to discuss your symptoms in a calm, factual environment. An online consultation is a convenient way to determine whether your symptoms require a Faecal Elastase test or if they are more likely related to other digestive conditions like GORD or IBS.

Our editorial team ensures all advice aligns with NHS protocols. During a consultation, a GP can review your medical history, discuss the nature of your stools, and provide you with a referral or a letter for your local surgery to initiate the necessary testing pathways. Early intervention is key to preventing long-term complications from malnutrition.