What is the role of chronic inflammation in the development of cancer?
Chronic inflammation is a proven driver of cancer: it promotes every step of tumour formation and makes tumours more resistant to treatment. Managing long-term inflammation, for example through weight control or treatment of chronic infections, is therefore a relevant strategy for lowering your cancer risk.
Many cancers begin in places where the body has had to deal with infection, irritation, or long-term swelling and tissue damage. This persistent state encourages every step of tumour formation: from the first damage to DNA, through tumour growth, to the spread of cancer cells to other organs. This connection is strong and is widely supported by the evidence.
Around a tumour, a small private environment takes shape, populated by immune and support cells. That environment acts like a breeding ground: it encourages the formation of new blood vessels so the tumour can access oxygen and nutrients, helps tumour cells escape the immune system, and makes the tumour more resistant to treatment. A key protein in this process acts like a switch that controls genes involved in swelling and tissue irritation. When this switch is permanently on, it directly contributes to uncontrolled cell growth and the spread of cancer, making it an interesting target for treatment.
Not all swelling and tissue irritation promotes cancer. A short-lived response can actually activate immune cells that recognise and attack tumour cells. Long-term, ongoing irritation has the opposite effect: it wears the immune system down and makes it increasingly tolerant of tumour cells. Also of interest are small immune structures that sometimes form inside a tumour and actually strengthen the immune response. Their presence is linked to better outcomes for patients, although it is not yet clear whether they are the cause or the consequence.
Two concrete lifestyle factors deserve attention. Fat tissue in people who carry excess weight releases substances that increase the risk of breast cancer and other cancers, and worsen the outlook. Notably, this also applies to people who are not classified as obese based on BMI but who do have irritated, overactive fat tissue. Chronically high insulin levels, as seen in obesity and type 2 diabetes, are also linked to this kind of ongoing irritation and a higher cancer risk, although a direct cause-and-effect relationship in people has not yet been fully established.
Based on multiple reviews and mechanistic studies. The mechanistic and epidemiological evidence for the role of chronic inflammation in cancer is strong; for specific sub-connections (tertiary lymphoid structures, hyperinsulinaemia) the evidence is associative and less definitive.
Can long-term inflammation in your body cause cancer?
Prolonged inflammation is one of the most robustly supported risk factors for cancer. Well-known causes such as smoking, substantial obesity, and certain infections are modifiable, so addressing them concretely lowers your risk.
Why does the risk of cancer increase with age?
Cancer becomes more common with age because DNA damage accumulates, the immune system declines, and damaged dormant cells can disrupt their surroundings. You cannot prevent this entirely, but limiting risk factors and following screening programmes helps to detect cancer early.
Which cancers does alcohol play a role in?
Alcohol increases the risk of several types of cancer, most strongly for mouth, throat, oesophageal and liver cancer. Even at moderate consumption levels the risk of breast and colorectal cancer can rise, so drinking less is always the safer choice.
What is the relationship between cancer and senescent cells?
Senescent cells initially protect against cancer, but when they accumulate they can actually promote tumour growth through inflammatory substances and a weakened immune defence. That dual mechanism is well described biologically, but how individuals can influence it is still very much under investigation.
Does chronic inflammation accelerate the ageing of your cells?
Chronic inflammation demonstrably accelerates cellular ageing through a negative spiral that is difficult to break. The best evidence-based approach to tackling that spiral is through lifestyle factors that dampen low-grade inflammation, such as sufficient exercise and a diet low in ultra-processed products.
What does chronic sleep deprivation do to your inflammation in the long run?
Chronic sleep deprivation demonstrably raises inflammatory markers in your blood and is linked to diseases such as cardiovascular disease and dementia; getting enough sleep is therefore one of the most concrete things you can do yourself to limit chronic inflammation.