A major night-time warning sign of cancer is something many people overlook—because it only shows up while they are asleep.
According to WebMD, cancer is the second leading cause of death worldwide, surpassed only by heart disease. In 2021, the disease took the lives of roughly 10 million people, and the American Cancer Society predicts that 2 million individuals in the U.S. alone will receive a diagnosis in 2025.
Early detection and awareness are two of the most powerful tools we have against this deadly illness. Cancer does not discriminate. It affects people of every age, background, and lifestyle. Although many assume that only smokers, heavy drinkers, or people with poor diets are at risk, the truth is far more complex—even people who live health-consciously can develop cancer.
That is why recognizing its subtle symptoms is absolutely essential.
One nighttime symptom stands out: unexplained sweating or hot flashes while asleep.
Many cancer patients report intense night sweats or sudden hot flashes, often severe enough to drench clothing or bedding. These episodes can be caused by:
Hormonal changes triggered by certain cancers
The body’s attempt to lower its temperature in response to cancer-related fever
Side effects of hormone-based treatments, such as those used for breast, endometrial, or prostate cancers
A 2003 study noted that while the exact prevalence of night sweats in advanced cancer is unclear, when they do occur, they are one of the most draining and distressing symptoms for patients nearing the end of life.
In women with breast cancer, night sweats are often linked to low estrogen levels. In men with prostate cancer, they commonly arise from androgen-blocking therapy.
When should you worry?
If you frequently experience:
Hot flashes at night
Heavy night sweats
Unexplained fever
Unintentional weight loss
Any other persistent, unusual symptoms
…it is important to speak with a doctor. These signs do not automatically mean cancer, but they should never be ignored—especially when they occur together.
