For individuals with pancreatic cancer, blood clots are not merely a complication of the disease—they may also provide insight into how severe the cancer is. Research connected to the COMPASS trial in 2025 suggests that the early appearance of clots may be linked to particularly aggressive tumor subtypes.
When venous thromboembolism occurs within the first three months after diagnosis, it is often associated with tumors that have biological characteristics promoting faster growth and poorer survival outcomes. Because of this connection, doctors view sudden or unexplained leg swelling as a possible warning sign that the disease may progress more aggressively.
Protein Deficiencies and Systemic Edema
Not all swelling associated with pancreatic disease is caused by blood clots. In certain cases, swelling may appear in both legs due to a condition called systemic edema, which occurs when the body’s fluid balance becomes disrupted, according to the Mayo Clinic.
Albumin, a protein produced by the liver, plays a key role in keeping fluid contained within the blood vessels. When albumin levels drop too low, fluid begins to leak out of the vessels and accumulate in surrounding tissues, resulting in swelling.
Pancreatic tumors can interfere with this process because they may block the release of important digestive enzymes. Without these enzymes, the body struggles to properly absorb proteins from food. Over time, this can lead to a condition known as hypoalbuminemia, particularly in more advanced stages of the disease. In some cases, the tumor may also affect liver function or trigger widespread inflammation in the body, both of which can further reduce albumin levels.
This type of swelling commonly appears as pitting edema, which is usually most noticeable around the ankles and feet. A simple way to check for pitting edema is by gently pressing a finger into the swollen area—if a temporary indentation remains, it may indicate this condition. Unlike swelling caused by DVT, which typically affects only one leg, systemic edema usually develops gradually and tends to involve both legs.
