How Sleep and Stress Affect Cancer Risk

More than two million Americans are expected to receive a cancer diagnosis in 2026, highlighting the importance of prevention and early detection.

April is National Cancer Control Month, a time dedicated to raising awareness about ways people can reduce their risk of cancer and improve early detection. While healthy eating and regular exercise are often emphasized, sleep and stress management are also important factors that influence overall health.

Sleep and stress: overlooked factors in prevention

Getting consistent, high-quality sleep and managing stress effectively both support the body’s proper functioning. Long-term sleep disruption—such as chronic insomnia or years of overnight shift work—along with ongoing psychological stress may contribute to changes in the body that increase health risks.

Although researchers have not confirmed a direct cause-and-effect link between sleep problems, stress, and cancer, studies suggest that both can affect the body in several ways. Chronic stress and poor sleep may:

• Weaken the immune system
• Increase inflammation
• Disrupts hormone balance
• Interfere with DNA repair processes

In addition, persistent stress and fatigue may lead to unhealthy coping behaviors, such as smoking, poor diet, physical inactivity, overeating, or excessive alcohol use, lifestyle factors already associated with higher cancer risk.

Small steps can make a difference

During National Cancer Control Month, consider making simple changes that support better rest and stress management. For example:

• Establish a consistent bedtime routine
• Limit screen time before sleep
• Practice stress-reduction techniques such as meditation, exercise, or deep breathing
• Make time for regular rest and relaxation

At the same time, staying up to date on recommended cancer screenings remains one of the most important steps in early detection and treatment.

To learn more about prevention, screening, and ongoing research, visit the American Cancer Society at cancer.org. Small, everyday choices can help support your long-term health.