The pancreas has two major jobs: it produces enzymes that break down the food you eat, and it releases hormones that control your blood sugar. It’s a large gland tucked behind your stomach and in front of your spine, roughly the size of a hand, with your liver, gallbladder, and spleen surrounding it. Despite being easy to forget about, the pancreas is involved every time you eat a meal.
Where the Pancreas Sits
The wider end (the head) nestles into the curve of your duodenum, the very first section of your small intestine where food arrives after leaving the stomach. From there it stretches across to the left side of your body, tapering into a thin tail that reaches toward the spleen. This positioning is practical: the pancreas delivers digestive enzymes directly into the duodenum right where partially digested food needs them most.
Breaking Down Food
About 95% of the pancreas is devoted to its digestive role. Specialized cells produce enzymes that target each of the three main nutrients in your diet:
- Lipase works alongside bile from your liver to break down fats.
- Protease breaks down proteins into smaller components your body can absorb.
- Amylase converts starches into simple sugars your cells can use for energy.
These enzymes travel through a duct system that funnels them into the duodenum. Without them, food would pass through your intestines largely undigested, and your body would struggle to extract the calories and nutrients it needs.
Neutralizing Stomach Acid
The pancreas also floods the small intestine with bicarbonate, a substance that neutralizes the highly acidic contents arriving from your stomach. This matters because pancreatic enzymes can only do their work in a less acidic environment. Duct cells lining the pancreas pull bicarbonate from the bloodstream and pump it into the intestine, and water follows along osmotically. The result is a large volume of alkaline fluid that transforms the small intestine into the right chemical environment for digestion.
Controlling Blood Sugar
Scattered throughout the pancreas are small clusters of hormone-producing cells called islets. These islets make up only a small fraction of the organ, but they’re essential for life. About 48% to 59% of the cells in each islet produce insulin, and 33% to 46% produce glucagon. Together, these two hormones keep your blood sugar stable.
Insulin and glucagon work as a counterbalancing pair. When blood sugar rises after a meal, the pancreas releases insulin, which moves glucose out of the blood and into cells where it’s used for energy. When blood sugar drops too low between meals or during exercise, the pancreas releases glucagon instead. Glucagon signals the liver to convert its stored glucose back into a usable form and release it into the bloodstream. It also tells the liver to stop absorbing glucose so more stays available in the blood, and it triggers the production of new glucose from other sources like amino acids.
This system responds remarkably fast. The first burst of insulin begins within two minutes of eating and lasts 10 to 15 minutes. A second, slower phase of insulin release follows and continues until blood sugar returns to normal. This rapid first phase is one of the earliest things to deteriorate in people developing type 2 diabetes.
What Happens When the Pancreas Fails
Because the pancreas handles two very different jobs, problems tend to fall into two categories.
When the digestive side breaks down, a condition called exocrine pancreatic insufficiency develops. The pancreas no longer produces enough enzymes to properly digest food. The most noticeable symptoms are diarrhea, loose and greasy stools that smell unusually bad, and unexplained weight loss. Over time, poor fat absorption means your body can’t take in fat-soluble vitamins effectively. In rare cases this leads to problems with night vision (from vitamin A deficiency) or weakened bones and osteoporosis (from vitamin D deficiency).
When the hormone-producing side fails, blood sugar regulation falls apart. If the insulin-producing cells are destroyed by the immune system, the result is type 1 diabetes. If they gradually lose function, often in the context of insulin resistance, type 2 diabetes develops. In either case, the fundamental problem is the same: glucose builds up in the blood instead of entering cells, and the body loses its ability to store and release energy properly.
Pancreatitis, or inflammation of the pancreas, can disrupt both functions at once. Acute pancreatitis is sometimes detected through a blood test measuring lipase levels. A normal range is roughly 0 to 160 units per liter; a result three or more times above that upper limit is a strong indicator of acute inflammation.
Signs Your Pancreas Needs Attention
Pancreatic problems don’t always announce themselves clearly, which is part of what makes them tricky. Persistent upper abdominal pain that radiates to your back, especially after eating, is one of the more recognizable warning signs. Unintended weight loss despite eating normally, oily or floating stools, and new-onset difficulty managing blood sugar are all signals that pancreatic function may be compromised. Because the organ sits deep in the abdomen rather than near the surface, issues can develop quietly before symptoms become obvious.