Cancer in the head of the pancreas — and why it turns you yellow first

The pancreas is one organ, but where a tumour sits inside it changes almost everything about how it is found, what it does to you first, and what can be offered. The gland has a head, a neck, a body and a tail. The head is the widest part, sitting to the right of the midline, tucked into the curve of the duodenum — the first stretch of small bowel leaving the stomach.

Two tubes run through that crowded space. The lower bile duct comes down from the liver and gallbladder and passes through the back of the pancreatic head to reach the duodenum. The pancreatic duct, carrying digestive juice, joins it right at that exit point. So the head of the pancreas is not a quiet corner of the abdomen. It is a junction, and anything growing in it quickly starts pressing on something that matters.

That is the whole reason head of pancreas cancer announces itself the way it does. A pancreatic head tumour of quite modest size can squeeze the bile duct shut. Bile then backs up, and the pigment in it spills into the blood and stains the skin and the whites of the eyes yellow. This is obstructive jaundice, and it is the commonest way a tumour in this part of the gland is discovered.

Most tumours found here are pancreatic ductal adenocarcinoma, which arises from the lining of the pancreatic duct — our page on pancreatic ductal adenocarcinoma explained covers what that diagnosis means in full. Not everything in this position is that, though. Tumours of the ampulla, of the lower bile duct and of the duodenum itself sit within millimetres of the pancreatic head, cause the same yellow eyes, and are often grouped together as periampullary tumours until the pathology says otherwise. Some of those carry a distinctly better outlook, which is one good reason not to settle on a diagnosis before imaging and tissue agree.

If you have arrived here with a scan report describing a head of pancreas mass and nothing else explained, start with the wider picture in our complete guide to pancreatic cancer, then come back to this page for what the position specifically means.

Jaundice is not a rare finding, and cancer is not its usual cause. A gallstone lodged in the bile duct, hepatitis, alcohol-related liver disease, a reaction to a medicine and benign narrowing of the duct all block or overwhelm the same plumbing far more often than a tumour does. The point of this list is not to talk you into a diagnosis. It is to separate the patterns that can wait for a routine appointment from the one that should not.

• Yellow eyes or skin with no pain and no fever — same week. This is the pattern that matters most. Gallstone jaundice usually hurts, and often brings fever and shivering; painless, steadily deepening yellowing does neither, and that difference is worth acting on rather than watching.
• Dark urine and pale stools together. This pair frequently appears before anyone notices a change in skin colour, and it is easy to dismiss. Mention it directly rather than waiting to be asked.
• Itching all over with no rash to explain it. Especially when it is worse at night and no new soap, detergent or medicine accounts for it.
• Unexplained weight loss with a dull upper-back ache. Weight that keeps falling without dieting, alongside a nagging ache that eases when you lean forward, is worth a scan rather than another course of antacids.
• New diabetes in an older adult that arrives with weight loss. New diabetes on its own is common and almost never this. New diabetes together with unexplained weight loss, in someone who was not overweight, is a different conversation.
• Meals suddenly not going down, or vomiting after eating. Portions shrinking without a decision to eat less, or food coming back up, points at the stomach outlet and needs assessing.
• A pancreatic head mass already reported on a scan. Bring the disc, not only the report. What is written matters less than the tumour's relationship to the arteries and veins behind the gland, and that can only be judged on the images themselves.

It starts with a free 45-minute consultation. That is long enough to open your scan discs rather than read a summary aloud, to say plainly whether the tumour looks removable, borderline or not currently removable, and to write down the order in which things will happen. If you are yellow when you arrive, relieving that is often the first practical step, and whether it is done before or after the staging scan is a decision we will explain rather than announce.

What CION runs directly is the diagnostic and systemic side. Pancreatic-protocol CT and MRI/MRCP are ordered and reported by us. CA 19-9 and bloods are ours. The tumour board that decides resectability — medical, surgical and radiation oncologists looking at the same images — is ours, and it meets before a date is offered, not after. Combination chemotherapy before an operation, chemotherapy after one, radiation and chemoradiation where they are indicated, nutrition and pancreatic enzyme support, blood sugar review, pain control, psycho-oncology, genetic counselling where the family history warrants it, and long-term follow-up: all in-house, across 35+ centres.

What CION does not do in-house is the surgery or the endoscopy. The operation for a tumour in this position is a pancreaticoduodenectomy, better known as a Whipple, and it is coordinated with specialist hepatobiliary and GI surgical partners, carried out at their hospital, and that part of your care may be billed there. The same is true of the endoscopic ultrasound biopsy, of ERCP and biliary stenting, of staging laparoscopy, and of PET imaging where the plan needs it. We arrange them, we hold the plan around them, and we tell you in advance which bill sits where. Our page on the Whipple procedure and what to expect sets out what the operation removes and what recovery really involves.

One point worth saying plainly, because it is the one most often lost. A tumour in the head that has caused jaundice early is not automatically worse news than one found elsewhere in the gland. It is frequently the reason it was found while an operation is still on the table at all. Jaundice is a miserable symptom and a genuinely useful one.

1. 1

   Your images are opened, not summarised

   We look at where the tumour sits against the portal and superior mesenteric veins and the arteries behind the gland. That relationship, rather than the size, is what the whole operability answer rests on.

   In-house at CION
2. 2

   The jaundice is treated as its own problem

   Whether your bile duct needs draining now, later or not at all depends on how deep the jaundice is, whether there is infection, and whether chemotherapy is planned first. Where a stent is needed, we book the ERCP with our endoscopy partners.

   CION decision; ERCP with endoscopy partners
3. 3

   Tissue, where the plan needs it

   A biopsy is not always required before an operation, but it is required before chemotherapy. Where it is needed it is usually taken at endoscopic ultrasound, arranged by us and performed at a partner unit.

   Coordinated with endoscopy partners
4. 4

   Tumour board, then a plain answer

   Resectable, borderline resectable, locally advanced or metastatic — said in ordinary words, along with what would have to change for that answer to change. Where a tumour is borderline, chemotherapy first is often what makes an operation possible later.

   In-house at CION
5. 5

   Eating, weight and blood sugar, from the first week

   Enzyme replacement, a realistic eating plan and diabetes review are started early rather than left until after surgery. People who go into treatment better nourished tolerate it better.

   In-house at CION
6. 6

   Costs, cover and who bills what

   A written estimate, an explicit split between what CION bills and what a partner hospital bills, and whether Aarogyasri, NTR Vaidya Seva or your own insurance applies to each part.

   In-house at CION

Medical disclaimer: This page explains why a tumour in the head of the pancreas commonly causes jaundice and what the surrounding pathway involves, and is reviewed by a CION medical oncologist with reference to NCCN guidance on pancreatic adenocarcinoma. Jaundice has many causes, most of them not cancer, and this is general information rather than a diagnosis; your own findings must be assessed by your treating team. Pancreatic-protocol CT, MRI/MRCP, CA 19-9 and bloods, tumour-board planning, chemotherapy, radiation, chemoradiation and SBRT, genetic counselling, nutrition and pancreatic enzyme (PERT) support, pain and psycho-oncology care and survivorship follow-up are delivered by CION. Endoscopic ultrasound and biopsy, ERCP and biliary or duodenal stenting, staging laparoscopy, the Whipple procedure and every other pancreatic resection, coeliac plexus block, PET-CT and DOTATATE PET and PRRT are coordinated with specialist hepatobiliary, gastroenterology, endoscopy and nuclear medicine partner centres and may be billed there.