Chronic pancreatitis and its complications
Chronic pancreatitis is long-standing inflammation of the pancreas leading to irreversible scarring and progressive loss of function. Unlike acute pancreatitis, which resolves, the changes here are permanent. The condition is dominated by three problems: pain, loss of digestive enzymes, and loss of insulin. Treatment addresses each, and surgery has a well-defined role in selected patients.
How it forms
Repeated or sustained injury to the pancreas provokes a cycle of inflammation and repair. With each cycle, functioning glandular tissue is replaced by fibrous scar. The duct system becomes distorted — strictured in places, dilated in others — and protein plugs form within it, which may calcify into stones that further obstruct drainage. Obstruction raises pressure within the ducts and the gland, which is one of the mechanisms of pain.
As acinar tissue is lost, enzyme production falls, and digestion — of fat in particular — fails. As the islets are destroyed, insulin production falls and diabetes develops. Both are late features: symptoms of insufficiency typically appear only once a large proportion of the gland has been lost, which is why the disease is often well advanced by the time it is recognised.
Pain arises from more than duct pressure. Chronic inflammation causes changes in the nerves supplying the pancreas, with nerve enlargement and infiltration by inflammatory cells, and over time the central nervous system itself becomes sensitised. This explains a clinically important observation: relieving duct obstruction helps many patients but not all, because by then the pain has acquired a neuropathic component independent of the original cause.
Causes include alcohol, which is the commonest; smoking, which is an independent risk factor and accelerates progression; recurrent acute pancreatitis of any cause; duct obstruction from stricture or tumour; autoimmune pancreatitis; hereditary pancreatitis from mutations such as PRSS1, SPINK1 and CFTR; and a proportion in which no cause is identified.
Symptoms
- Pain — upper abdominal, radiating to the back, sometimes continuous and sometimes in episodes, often worse after eating. It dominates the illness for most patients.
- Steatorrhoea — pale, bulky, greasy, offensive stools that float and are difficult to flush, from undigested fat.
- Weight loss and malnutrition, compounded by patients eating less to avoid pain.
- Diabetes — often brittle and difficult to control, because both insulin and glucagon production are lost.
- Deficiency of fat-soluble vitamins A, D, E and K, and reduced bone density.
- Jaundice, where scarring compresses the bile duct.
How the diagnosis is made
CT demonstrates calcification, duct dilatation, gland atrophy and complications. MRI with MRCP shows duct anatomy in detail and is the better test for early disease, particularly with secretin stimulation. Endoscopic ultrasound is the most sensitive test in early disease, before structural changes are visible on cross-sectional imaging.
Function is assessed by faecal elastase, which is low in exocrine insufficiency, along with nutritional markers, fat-soluble vitamin levels and HbA1c.
A recurring difficulty deserves emphasis: distinguishing an inflammatory mass in chronic pancreatitis from pancreatic cancer can be genuinely hard, and the two coexist — chronic pancreatitis is itself a risk factor for cancer. Any mass, any new or changing stricture, and any unexplained deterioration is investigated on the assumption that cancer must be excluded rather than assumed absent.
Treatment
Medical and supportive
- Stopping alcohol and smoking. Both slow progression; smoking cessation is as important as alcohol and is frequently overlooked.
- Pancreatic enzyme replacement with meals, at adequate dose and taken correctly — under-dosing is the usual reason for apparent failure. Acid suppression improves effectiveness.
- Nutritional support, with dietetic input and correction of vitamin deficiencies.
- Diabetes management, recognising that this form is unstable and prone to hypoglycaemia.
- Pain management, ideally through a service experienced in chronic pain, using a structured approach rather than escalating opioids indefinitely.
Endoscopic treatment
For a dominant duct stricture or stones, ERCP with stenting, dilatation or stone extraction can relieve obstruction. Extracorporeal shockwave lithotripsy is used to fragment large duct stones. Endoscopic treatment is generally the first structural intervention, though the evidence favours surgery for durable pain relief where the anatomy is suitable.
Surgery
Surgery is considered for intractable pain, for complications, and where cancer cannot be excluded. The choice of operation follows the anatomy:
- Drainage procedures — lateral pancreaticojejunostomy (Puestow), where the main duct is dilated. The duct is opened along its length and joined to a loop of small bowel, decompressing the system while preserving pancreatic tissue.
- Resection — pancreaticoduodenectomy where disease is concentrated in the head, or distal pancreatectomy for the tail.
- Hybrid procedures — the Frey and Beger operations, which core out the diseased head while draining the duct, combining both principles and preserving more tissue than a formal Whipple.
The choice is individualised. Duct diameter, where the disease is concentrated, whether there is an inflammatory mass, the state of the bile duct and duodenum, and the patient's diabetes all bear on it. Earlier surgery, before pain becomes centrally sensitised and before the gland is exhausted, produces better results than surgery offered only after years of escalating analgesia.
Complications requiring specific treatment
Pseudocysts, biliary obstruction, duodenal obstruction, splenic vein thrombosis with gastric varices, and pancreatic fistula or ascites each have their own management, endoscopic, radiological or surgical according to the circumstances.
Recovery
Recovery depends on the procedure. Drainage operations are generally better tolerated than resections. Pain improves substantially in the majority after appropriate surgery, though not invariably, and patients are counselled honestly about this before the decision. Enzyme replacement is usually still required afterwards, and diabetes may worsen after resection.
Follow-up
Lifelong. Follow-up covers nutrition, enzyme dosing, diabetic control, bone density, vitamin levels, and surveillance for the increased risk of pancreatic cancer. Continued abstinence from alcohol and tobacco is revisited at every visit, because it remains the most effective intervention available.
When to seek a specialist opinion
Where pain is not controlled by medical treatment, where weight loss continues despite enzyme replacement, where imaging shows a dilated duct or stones amenable to treatment, or where any mass or stricture raises the question of cancer. An opinion is worth seeking before rather than after years of opioid escalation.
Common questions
Why is the pain so difficult to control?
Because it has more than one source. Pressure builds in an obstructed duct; inflammation and scarring involve the nerves running through and behind the pancreas; and over time the nervous system itself becomes sensitised, so pain persists even when the original stimulus has settled. This is why treating only one of these — with painkillers alone, for instance — often disappoints, and why a combined approach works better.
Will stopping alcohol help if the damage is already done?
Yes. Continuing to drink accelerates further destruction, worsens pain and makes every treatment less effective. Stopping smoking matters at least as much and is frequently overlooked — smoking is an independent driver of progression and of pancreatic cancer risk in this condition.
Why are my stools pale, greasy and hard to flush?
Because the damaged pancreas is no longer producing enough enzyme to digest fat, so it passes through undigested. This also causes weight loss and deficiency in the vitamins carried in fat. It responds well to enzyme capsules taken with meals, and the dose is commonly set too low — if symptoms persist, ask about increasing it.
Why have I become diabetic?
Because the same scarring that destroys the enzyme-producing tissue eventually destroys the insulin-producing cells. This form of diabetes is distinctive: the cells producing glucagon, which raises blood sugar, are lost too, so blood sugar can swing low unpredictably. It needs managing by someone familiar with this particular pattern.
Can an operation cure it?
Surgery does not reverse the damage, but it can relieve pain very effectively, and in many patients dramatically. Which operation depends on whether the main duct is dilated — in which case draining it works well — or whether there is an inflammatory mass in the head of the pancreas, which is better removed. Modern combined procedures both drain the duct and remove the affected head while preserving as much function as possible.
Should I have surgery early or try everything else first?
Evidence has shifted toward operating earlier rather than after years of escalating painkillers. Patients offered surgery early have better pain control and less opioid dependence than those managed with repeated endoscopic procedures first. It is worth discussing rather than assuming surgery is a last resort.
Am I at risk of pancreatic cancer?
The risk is increased, particularly in long-standing disease and in the hereditary forms, and smoking multiplies it. It remains a minority outcome, but it is a reason for prompt investigation if your pattern of symptoms changes, if you lose weight unexpectedly, or if you become jaundiced.
What can I do myself?
Four things, all of which genuinely alter the course: stop alcohol completely, stop smoking, take enzyme capsules properly with every meal, and eat adequately with dietitian support rather than restricting fat severely, which worsens malnutrition. Vitamin levels and bone density are checked periodically, as deficiency and osteoporosis are common and treatable.
Related conditions
Other conditions of the pancreas covered on this site:
- Pancreatic ductal adenocarcinoma
- Acute pancreatitis
- Pancreatic cysts — IPMN and MCN
- Pancreatic neuroendocrine tumours
- Solid pseudopapillary neoplasm and other rare pancreatic tumours
- Periampullary lesions
- Pancreas divisum
- Annular pancreas
This page provides general information and does not replace an individual medical consultation. Assessment and treatment are decided for each patient after review of their history, examination and investigations.