Based on PubMed | Is fever at night a symptom of endometrial cancer?

Night fever is not a typical early symptom of endometrial (uterine) cancer. The most common and hallmark symptom is abnormal vaginal bleeding, such as bleeding between periods, very heavy or prolonged bleeding after age 40, or any bleeding/spotting after menopause. ^[1] Pelvic pain or cramping and, less often, pain with sex or difficulty urinating can also occur, especially in later stages. ^{[2] [3]} Public‑health guidance highlights abnormal bleeding or discharge as the key warning sign to act on right away. ^{[4] [5]}

Where night fever fits in

• Fever or night sweats can occur with many cancers in general, but they are considered nonspecific and are not characteristic presenting signs of endometrial cancer. ^[6] When endometrial cancer advances, some people may experience later‑stage systemic symptoms like unexplained weight loss or pelvic pain, rather than fever being a defining feature. ^{[3] [2]}
• In clinical series of endometrial cancer, the dominant presenting complaint is bleeding; studies show postmenopausal or irregular bleeding is reported far more often than other symptoms, with pain becoming more likely only in later‑stage disease. ^{[7] [8]} These reviews do not identify fever or night sweats as common presenting symptoms. ^{[9] [10]}

Could night fever be related to cancer at all?

• In oncology broadly, persistent unexplained fevers or night sweats can occur from tumor‑related inflammation or cytokine release, but this pattern is best known with lymphomas and some other cancers rather than endometrial cancer. ^[6] Medical literature notes that malignancy‑related fever is uncommon compared with infection and is more classically associated with hematologic cancers. ^[11]

Common, non‑cancer causes of night fever or night sweats

• Infections are the most frequent cause of fever, including nighttime spikes. ^[11] Respiratory, urinary, dental, or skin infections are common examples and should be considered, especially if you have a temperature of 38°C (100.4°F) or higher, chills, or feel acutely unwell. ^[12]
• Hormonal changes (such as menopause), medications, and other conditions can also cause hot flashes and night sweats without fever. ^[13]

When to seek care

• Any abnormal vaginal bleeding particularly after menopause should prompt timely evaluation by a clinician. ^{[4] [1]} If you are experiencing persistent fevers at or above 38°C (100.4°F), chills, or night sweats without a clear cause, it’s reasonable to see a clinician to check for infection and other explanations. ^[12]
• If you are receiving or recently received cancer treatment, fever at or above 38°C warrants urgent assessment because it can signal treatment‑related infection. ^{[14] [12]}

Bottom line

• Night fever by itself is not a typical sign of endometrial cancer. ^{[7] [2]} Endometrial cancer most often presents with abnormal vaginal bleeding, and guidance prioritizes evaluation of this symptom above others. ^{[4] [1]}
• Persistent or unexplained fevers or night sweats deserve medical attention, but they more often point to infection or non‑gynecologic causes rather than early endometrial cancer. ^{[11] [6]}