Common sleep symptom could signal cancer in some cases, doctor warns

Night sweats are often the result of hormonal fluctuations or bedroom conditions, but they could be an indicator of another big health threat: cancer.

According to Dr Jiri Kubes, medical director at the Proton Therapy Center, cases of severe and ongoing night sweats should not be dismissed without proper medical evaluation.

Blood cancers, lymphoma in particular, are among the malignancies most frequently associated with this symptom.

"Most night sweats are not caused by cancer, but persistent or drenching sweats that continue over time without a clear explanation should always be properly assessed," he said.

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Certain cancers can prompt the body to release inflammatory substances that disrupt its natural ability to regulate temperature.

This disruption manifests during sleep as episodes of profuse sweating that can be remarkably intense.

"With certain cancers, the body produces inflammatory chemicals that can affect temperature regulation," Dr Kubes explained.

"This can lead to episodes of significant sweating during the night, sometimes enough for people to wake up with soaked clothing or bedding."

The immune response and hormonal balance can both be affected by malignant conditions, triggering excessive perspiration while patients sleep.

Lymphoma and other blood cancers are particularly noted for producing this symptom.

Many individuals fail to recognise the potential significance of this symptom because they readily attribute it to everyday factors such as anxiety, hormonal fluctuations during menopause, inadequate sleep quality or simply an overly warm bedroom.

"People often try to explain it away for months before seeking medical advice," Dr Kubes said. "It's usually the persistence of the symptom that becomes concerning rather than a single isolated episode."

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The oncologist noted that night sweats become considerably more concerning when they present alongside other indicators.

These warning signs include losing weight without explanation, experiencing persistent tiredness, noticing enlarged lymph nodes, or suffering from recurring fevers.

Experts stress that sweating occasionally during the night is exceedingly common and typically poses no cause for alarm, particularly during warmer months or stressful periods.

However, symptoms that persist without an obvious explanation merit professional attention rather than dismissal.

"If someone is experiencing regular drenching night sweats, particularly if they are waking repeatedly or noticing other symptoms, it's important to speak to a doctor," Dr Kubes said.

He noted that while investigations may ultimately reveal nothing serious, it remains prudent to examine persistent bodily changes.

Early cancer symptoms frequently overlap with far more commonplace conditions, making awareness of ongoing changes particularly valuable.

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