Hot flashes, beyond menopause, can signal illnesses like thyroid disorders (hyperthyroidism), certain cancers (leukemia, lymphoma, carcinoid tumors), infections (flu, HIV), endocrine issues (diabetes, pituitary tumors), neurological conditions (autonomic neuropathy, MS), and even severe anxiety or sleep apnea, often linked to hormonal shifts or disruptions in the body's temperature control (hypothalamus) or nervous system.
Rarely, something other than menopause causes hot flashes and nights sweats. Other causes may include medicine side effects, problems with the thyroid, some cancers and side effects of cancer treatment.
Physicians need to be aware of medical conditions that may mimic hot flashes (26). These include flashing caused by systemic diseases such as carcinoid syndrome, systemic mast cell disease, pheochromocytoma, medullary carcinoma of the thyroid, pancreatic islet cell tumors, and renal cell carcinoma.
Medical conditions or medicines that can cause hot flashes include:
When should I see my healthcare provider about hot flashes? Contact your healthcare provider if hot flashes are interfering with your life. They can discuss treatment options with you to help reduce your symptoms.
Hot flashes occur from a decrease in estrogen levels. In response to this, your glands release higher amounts of other hormones that affect the brain's thermostat, causing your body temperature to fluctuate. Hormone therapy has been shown to relieve some of the discomfort of hot flashes for many women.
Hot Flashes & Night Sweats
Hyperthyroidism can cause symptoms similar to hot flashes, such as excess sweating, high body temperature, and heat intolerance. For both people in the menopause transition and people with thyroid disorders, hot flashes can lead to overheating and sweating while you sleep.
There are many autoimmune diseases that have symptoms such as night sweats, fever, and hot flashes. It goes on to say that night sweats are often a sign of an underlying infection.
Night sweats may occur with any condition causing fever. Although suggestive of tuberculosis or lymphoma, they also occur in brucellosis, lung abscess, bacterial endocarditis, diabetic autonomic neuropathy, nocturnal hypoglycemia, nocturnal angina, and diabetes insipidus.
Some diseases that can cause hot flashes include cancer of the ovaries, pituitary gland, uterus, and thyroid.
Hot flashes and night sweats were most linked to white matter hyperintensities in the frontal lobe of the brain, the area responsible for voluntary movement, expressive language, and the ability to plan and organize.
Other causes of night sweats in males and females include:
As estrogen levels decrease, the part of the brain responsible for controlling the body's temperature — the hypothalamus — can mistakenly open up blood vessels in the skin and sweat glands to cool the body. This winds up having the opposite effect — making you suddenly feeling hot.
"Once a hot flash starts," Vinta says, "only cooling is going to stop it." The flipside of this equation is that heat can make things worse. Hot environments, spicy foods and cigarette smoke may trigger hot flashes, so it can help to avoid these things.
Some women experience an "aura," an uneasy feeling just before the hot flash, that lets them know what's coming. The flash is followed by a flush, leaving you reddened and perspiring. You can have a soaker or merely a moist upper lip. A chill can lead off the episode or be the finale.
Early lupus warning signs often mimic other illnesses, but key indicators include extreme fatigue, fever, joint pain/swelling, skin rashes (especially a butterfly-shaped rash on the face), hair loss, and sensitivity to sunlight, alongside potential issues like headaches, mouth sores, and fingers/toes turning white or blue in the cold (Raynaud's). These symptoms can appear suddenly or slowly and come and go in flares.
Lupus and Sjogren's syndrome are both autoimmune diseases. Up to 5.5 million people in the U.S. have been diagnosed with lupus or Sjogren's syndrome. However, Sjogren's syndrome occurs up to three times more than lupus, but one-third of lupus patients also have Sjogren's syndrome.
Three key signs of Sjögren's syndrome are dry eyes, dry mouth, and chronic fatigue, stemming from the autoimmune system attacking moisture-producing glands, leading to gritty, burning eyes, difficulty swallowing or speaking, and persistent tiredness, often accompanied by joint pain and swollen glands.
Cystitis and Thrush: Urinary tract infections or vaginal yeast infections can cause symptoms like burning, pelvic discomfort, or vaginal dryness, which may be mistaken for menopause symptoms. Hyperhidrosis: Excessive sweating due to hyperhidrosis can be confused with the hot flashes typical of menopause.
Early signs of thyroid problems often involve energy, temperature, and body changes, such as unexplained weight changes, fatigue, mood shifts (anxiety/depression), skin/hair issues (dryness, thinning), and altered heart rate or bowel habits, with hypothyroidism causing slow-down (cold, constipation, weight gain) and hyperthyroidism causing speeding up (heat, anxiety, weight loss, fast heart rate).
Women and men who are diagnosed with carcinoid tumors, medullary thyroid cancer, pancreatic cancer, or renal cell carcinoma may report hot flashes that are believed to be primarily due to tumor secretion, though detailed studies in the literature are lacking.
Hormonal imbalances show up as symptoms like fatigue, mood swings, weight changes, irregular periods, skin issues (acne), hair changes, sleep problems, brain fog, low libido, digestive issues, and temperature sensitivity, affecting energy, body functions, and mental well-being, often linked to stress, thyroid, or reproductive hormones.
Mood swings are another effect of low estrogen. You may feel sad, anxious, or frustrated. Shifting hormone levels and night sweats may disrupt your sleep. This can cause fatigue, which may make mood swings worse.