Diabetes is often seen only as a sugar control problem. In reality, its effects go much deeper. Long- standing , uncontrolled diabetes can create an internal bodily environment that may actively support the development and progression of certain cancers. One important link is insulin resistance. When the body does not respond properly to insulin, blood levels of the hormone often remain persistently high. Excess insulin can act like a direct growth signal for cells.
Along with this, chronic high blood sugar and obesity-related inflammation may encourage abnormal cell mutation and growth over time. This concern is strongly supported by global research. A large national observational study reported that type 2 diabetes was associated with a significantly higher cancer risk overall, with the strongest links seen in liver, pancreatic, and uterine cancers. Another major meta-analysis of cancer patients found that pre-existing diabetes was associated with a 41 percent higher risk of long-term mortality across various cancer types.
For patients who have already been diagnosed with cancer, uncontrolled diabetes can make medical treatment far more difficult. It frequently increases the risk of serious infections, delays surgical wound healing, and worsens treatment side effects, such as chemotherapy-related peripheral neuropathy, which manifests as nerve pain or numbness in the hands and feet. Metformin, a commonly used diabetes medicine, is also being intensively studied for its possible anti-cancer effects through pathways linked to cell growth and metabolism. However, it should be taken only as prescribed by a qualified physician for diabetes management, and it should not be viewed as an independent cancer prevention drug.
The core message here is not meant to cause fear, but rather to inspire proactive action. People living with diabetes should monitor their fasting sugar, post-prandial sugar, and HbA1c levels regularly. It is equally vital to follow age-appropriate cancer screening guidelines, maintain a healthy weight, exercise regularly, and seek medical advice early if any unusual symptoms develop. Ultimately, achieving good diabetes control can protect your long-term health on more than one front.
(The author is a Senior Consultant of Medical Oncology, HCG Cancer Hospital, Kolkata)