Pancreatic cancer usually does not have one single cause; it happens when DNA changes in pancreatic cells make them grow out of control. The exact trigger is often unknown, but several risk factors are well established, including smoking, older age, obesity, type 2 diabetes, chronic pancreatitis, and inherited gene changes such as BRCA2, PALB2, Lynch syndrome, and others.

Main risk factors

  • Smoking is one of the biggest risk factors.
  • Age matters; the risk rises as people get older.
  • Family history and inherited gene mutations can raise risk.
  • Obesity and lack of activity are linked with higher risk.
  • Chronic pancreatitis and some long-term inflammatory conditions can increase risk.
  • Type 2 diabetes is associated with increased risk, and in some cases pancreatic cancer can also cause new-onset diabetes.

What this means

Most people with pancreatic cancer did not do anything specific to cause it. In many cases, it seems to develop from a mix of chance DNA changes, lifestyle factors, and inherited risk.

When to get checked

If someone has unexplained weight loss, jaundice, ongoing upper abdominal pain, or a new diagnosis of diabetes later in life, they should get medical evaluation promptly. Those symptoms are not proof of cancer, but they can be warning signs.

TL;DR

Pancreatic cancer is caused by DNA changes in pancreas cells, but the exact cause is often unknown; smoking, age, obesity, diabetes, chronic pancreatitis, and inherited mutations are major risk factors.