From eastleighvoice.co.ke
Poor sleep may be contributing to the rising number of cancer cases among people under the age of 50, according to findings from two large studies presented at the American Society of Clinical Oncology.
The research suggests that irregular sleep patterns could be linked to a higher risk of developing early-onset cancers, including bowel, breast, uterine, and ovarian cancers. In some cases, individuals diagnosed with insomnia were found to be up to three times more likely to develop cancer within five years.
The findings add to growing global concern over the steady increase in cancer diagnoses among younger adults. Over the past three decades, early-onset cancer cases have risen by nearly 80 per cent worldwide, increasing from about 1.82 million in 1990 to 3.26 million in 2019.
Cancer-related deaths among people in their 40s, 30s, and younger have also increased by about 27 per cent over the same period, according to global cancer burden estimates cited in peer-reviewed oncology research, including BMJ Oncology publications.
Researchers analysed health data from more than 18 million adults aged between 18 and 50 drawn from long-term health records and insurance-linked medical databases, allowing researchers to compare sleep patterns, diagnoses of insomnia, and later cancer outcomes. They found that people with disrupted or consistently poor sleep patterns were more likely.
Individuals with a clinical diagnosis of insomnia showed a significantly elevated risk of developing cancer within five years following diagnosis. In some cases, the risk was reported to be up to three times higher compared with individuals without recorded sleep disorders.
Researchers said the results point to sleep disruption as a potentially important and modifiable factor in understanding early-onset cancer risk, although they emphasised that the findings do not prove causation.
“Sleep health is increasingly being examined as part of broader cancer prevention research, particularly as traditional risk factors alone do not fully explain the rising incidence of cancer in younger populations,” the researchers said.
According to researchers, they argued that sleep disruption could be integrated into future risk assessment models if further studies confirm the association.
Experts caution, however, that the relationship between poor sleep and cancer is complex. While sleep plays a key role in immune regulation, hormone balance, and cellular repair processes, current evidence does not confirm that insomnia directly causes cancer. Instead, researchers suggest that multiple overlapping pathways may be involved.
One possible explanation is biological. Chronic sleep disruption has been linked to impaired immune function, increased inflammation, and hormonal changes, all of which may influence how the body detects and responds to abnormal cell growth.
Sleep is also essential for processes such as DNA repair and metabolic regulation, which are important in preventing the development of malignant cells.
However, experts also point to behavioural factors that may confound the association. People experiencing long-term poor sleep are more likely to adopt unhealthy lifestyle patterns, including reduced physical activity, higher alcohol consumption, increased smoking rates, poor diet, and weight gain.
These factors are independently associated with a higher risk of several cancers, making it difficult to separate the direct effects of sleep from broader lifestyle influences.
There is also the possibility of reverse causation. Some researchers suggest that early, undiagnosed cancer may itself affect sleep quality through hormonal changes, pain, inflammation, or psychological stress. This means that in some cases, poor sleep could be an early symptom rather than a cause of cancer, further complicating the interpretation of the findings.
A health specialist commenting on the studies noted that the impact of insomnia on long-term disease risk is an emerging area of interest in public health research. The specialist emphasised that while the association is noteworthy, it should not be interpreted as evidence that sleep disturbance directly leads to cancer, but rather as an area requiring deeper investigation through long-term cohort studies.
Another public health expert from a leading cancer research organisation said the studies explore a potential link between insomnia and certain cancers in younger adults, but stressed that more long-term evidence is needed before firm conclusions can be made.
The expert added that population-based studies following individuals over longer periods would help clarify whether sleep disruption is a true risk factor or a correlated condition.
Cancer specialists continue to emphasise that established prevention strategies remain critical. These include avoiding tobacco use, maintaining a healthy body weight, engaging in regular physical activity, moderating alcohol consumption, and reducing excessive sun exposure. While sleep health is increasingly recognised as an important component of overall well-being, it is not yet included among established causal risk factors for cancer.
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