Early signs of serious illnesses often slip by unnoticed. One such overlooked clue could be right in your bed.

If you’re waking up to drenched sheets without an obvious reason, it might be more than a restless night—it could be your body signaling a deeper issue.

What Are Night Sweats?

Night sweats are more than mild perspiration. They’re episodes of excessive sweating that leave sheets or pillows soaked, even when the room isn’t hot and your bedding is normal. Many people dismiss them as dreams, stress, or a stuffy bedroom, but experts like Dr. Alberto Sanagustín note they can sometimes point to medical concerns.

Common Causes

Not every case is alarming. Night sweats can be triggered by:

Hormonal changes: Menopause, puberty, or pregnancy.

Infections: Tuberculosis, pneumonia, malaria, HIV—often paired with fever or chills.

Medications: Certain antidepressants and pain relievers.

Blood sugar drops: Common in people managing diabetes.

Lifestyle and health factors: Stress, anxiety, acid reflux, spicy food, or alcohol.

Still, persistent, unexplained night sweats can be an early warning sign of certain cancers.

Cancers Linked to Night Sweats

Doctors pay close attention to drenching night sweats because they’re strongly associated with:

Lymphoma (especially Hodgkin’s), often alongside weight loss or fevers.

Leukemia, which may alter immune function and raise infection risk.

Breast or prostate cancer, though less frequently.