Q: I heard night shift workers are more susceptible to cancer. Is this true?

Ask Our Expert About Night Shift and Cancer

About Our Expert

Carmine Pellosie, D.O., is an occupational medicine physician and medical director with HealthWorks, a program affiliated with Lehigh Valley Hospital and Health Network.

• I heard night shift workers are more susceptible to cancer. Is this true?
• Why is there a link between night shift and cancer?
• What can I do to reduce my risk?
• Are people who suffer from sleep disorders also at risk?
• Do you offer any services to assess sleep disorders?

Q: I heard night shift workers are more susceptible to cancer. Is this true?

A: Night shift workers, rotating shift workers and people who frequently travel across time zones have disturbances in their sleep (circadian) rhythm. In the long term, this may affect the production of melatonin (a hormone that maintains the body's sleep rhythm), leading to decreased immunity and increased risk for cancer. Epidemiological studies have found that long-term female night shift workers have a probable increased risk for breast cancer. The studies found that of all shift work patterns, those that involve night shift are the most detrimental to your health.

Q: Why is there a link between night shift and cancer?

A: Exposure to dim light during sleep alters your sleep activity patterns and suppresses melatonin production. The reduced production of melatonin can lead to decreased immunity and increased risk for cancer.

Q: What can I do to reduce my risk?

A: Healthy lifestyle and good sleep hygiene are really important. Here's how you can stay healthy on night shift:

• Get eight hours of sleep or more in a dark room after work. (Bright light exposure during work also can be beneficial.)
• Avoid caffeine for at least four to six hours before bedtime.
• Avoid alcohol, which initially acts as a sedative but then has sleep-disturbing effects.
• Get regular exercise, eat a healthy diet and lose weight, if needed.

Also, some people benefit from melatonin supplements. You should consult your doctor to find out if a supplement is appropriate for you.

Q: Are people who suffer from sleep disorders also at risk?

A: Sleep apnea is increasingly recognized as a health problem that disrupts sleep. If you think you may have sleep apnea, you should be evaluated by a sleep professional.

Q: Do you offer any services to assess sleep disorders?

A: Yes. Lehigh Valley Hospital and Health Network has a sleep disorders center that evaluates, diagnoses and treats sleep disorders, including sleep apnea and shift work disorder. To learn more, call 610-402-CARE.

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