Doctors warn that certain unusual changes during sleep at night may be early warning signs of serious health problems, including cancer. While these symptoms do not automatically mean someone has cancer, experts emphasize that they should never be ignored — especially if they persist or worsen over time.

1. Persistent Night Sweats

Occasional sweating during sleep can be normal, but frequent, heavy night sweats that soak clothes or bedding — especially without a clear cause like heat or exercise — may be a red flag. Doctors note that this symptom is sometimes associated with blood cancers such as lymphoma, as well as infections or hormonal disorders.

2. Shortness of Breath or Chest Discomfort at Night

Waking up at night with difficulty breathing, chest tightness, or unexplained coughing may indicate problems with the lungs or heart. In some cases, these symptoms have been linked to lung cancer or tumors pressing on airways. Any nighttime breathing difficulty should be evaluated promptly.

3. Unexplained Pain That Worsens at Night

Pain that becomes more intense during the night — especially bone pain, back pain, or headaches that disrupt sleep — can be concerning. Doctors explain that certain cancers may cause pain due to nerve compression, bone involvement, or increased inflammation when the body is at rest.

When to See a Doctor

Medical experts stress that these signs alone do not confirm cancer. However, if they:

• Persist for weeks

• Occur frequently

• Are accompanied by weight loss, fatigue, fever, or loss of appetite

then a medical examination is strongly recommended.