Exocrine Pancreatic Insufficiency (EPI): Symptoms, Causes and Treatment in the UK

Exocrine Pancreatic Insufficiency (EPI) is a condition where the pancreas fails to produce or secrete enough digestive enzymes. These enzymes—lipase, amylase, and protease—are essential for breaking down fats, carbohydrates, and proteins in the small intestine. Without them, the body cannot absorb vital nutrients, leading to malabsorption and malnutrition.

In the UK, EPI is most commonly associated with chronic pancreatitis, but it can also be caused by cystic fibrosis, pancreatic cancer, or previous gastrointestinal surgery. Because the symptoms often mimic other digestive issues like Irritable Bowel Syndrome (IBS) or Coeliac Disease, it is frequently underdiagnosed. According to NICE guidelines, identifying the underlying cause is the first step in effective management.

The symptoms of EPI are primarily related to the malabsorption of fats. When fat is not broken down, it passes through the digestive tract unchanged. Key symptoms to watch for include:

• Steatorrhoea: Stools that are pale, oily, foul-smelling, and difficult to flush away.
• Unexplained weight loss: Even if you are eating normally, your body is not absorbing calories.
• Abdominal pain: Often described as a cramping or gnawing pain, particularly after eating high-fat meals.
• Bloating and flatulence: Excess gas produced by undigested food in the gut.
• Vitamin deficiencies: Specifically fat-soluble vitamins (A, D, E, and K), which can lead to night blindness or weakened bones.

The pancreas is a resilient organ, and EPI symptoms often only appear when over 90% of pancreatic function is lost. Common causes seen by UK doctors include:

Chronic Pancreatitis

Long-term inflammation of the pancreas, often due to long-term alcohol consumption or smoking, is the leading cause of EPI in adults. This inflammation leads to permanent scarring of the pancreatic tissue.

Cystic Fibrosis

A genetic condition that causes thick mucus to block the pancreatic ducts, preventing enzymes from reaching the intestine. Most individuals with cystic fibrosis will require enzyme replacement from a young age.

Surgery and Other Conditions

Procedures such as a gastrectomy (stomach removal) or pancreatic surgery (the Whipple procedure) can alter how the pancreas interacts with food. Type 1 and Type 2 diabetes are also increasingly recognised as risk factors for milder forms of pancreatic insufficiency.

If you suspect you have EPI, a GP will typically follow a diagnostic pathway aligned with NHS standards. This usually begins with a faecal elastase test. You will be asked to provide a stool sample; a low level of the enzyme elastase in the stool is a strong indicator that the pancreas is not functioning correctly.

Additional tests may include blood tests to check for nutritional deficiencies (such as low Vitamin D or iron) and imaging like an ultrasound, CT scan, or MRI (MRCP) to look for physical damage to the pancreas. It is important to rule out other conditions like Crohn's disease or Coeliac disease during this process.

The cornerstone of EPI treatment in the UK is Pancreatic Enzyme Replacement Therapy (PERT). These are capsules containing a mixture of digestive enzymes (pancreatin) derived from porcine sources. Common brand names include Creon, Nutrizym, and Pancrease.

Effective management involves:

• Timing: Taking the capsules at the start of and during every meal and snack.
• Dosage: The dose is tailored to the fat content of the meal and the severity of the insufficiency.
• Diet: Following a healthy, balanced diet. Unlike in the past, NHS guidance no longer recommends a low-fat diet for EPI; instead, patients are encouraged to eat normally and adjust their PERT dose accordingly.
• Lifestyle: Quitting smoking and avoiding alcohol are essential to prevent further damage to the pancreas.

If you are experiencing persistent changes in your bowel habits, particularly the appearance of oily stools, you should speak to a GP online or in person. A consultation can help differentiate between common issues like IBS and more complex conditions like EPI.

An online doctor can review your symptoms, discuss your medical history (such as a history of heavy smoking or alcohol use), and advise on the necessary diagnostic tests. If you have already been diagnosed, an online consultation is a convenient way to discuss dose adjustments for your PERT or to manage the symptoms of a flare-up. Early intervention is key to avoiding the long-term complications of malabsorption, such as osteoporosis.