Hot Flashes & Night Sweats

March 2026SymptomsMedically reviewed

Hot flashes are sudden feelings of intense heat that can cause sweating, flushing, and rapid heartbeat. They are the most common symptom of menopause, affecting approximately 80% of women. Night sweats are hot flashes that occur during sleep, often causing significant sleep disruption.

What they feel like

A hot flash typically begins with a sudden sensation of heat in the chest, neck, and face. You may experience visible flushing or redness, sweating (especially on the upper body), rapid heartbeat, and a chilled feeling as the flash subsides. Episodes can last from 30 seconds to 10 minutes, and frequency varies from a few per week to multiple times daily.

Key facts at a glance

  • Affect up to 80% of menopausal women
  • Can last from 30 seconds to 10 minutes
  • Most common during perimenopause and early menopause
  • Both lifestyle changes and medical treatments can help

Why they happen

Hot flashes are caused by changes in the hypothalamus — the brain's temperature regulation center — triggered by declining estrogen levels. As estrogen drops during perimenopause and menopause, the hypothalamus becomes more sensitive to slight changes in body temperature, triggering the body's cooling mechanisms inappropriately.

What helps

Evidence-based strategies include: HRT (hormone replacement therapy) — the most effective treatment, reducing hot flashes by up to 75%. Low-dose SSRIs or SNRIs for women who cannot take HRT. Lifestyle modifications: keeping rooms cool, dressing in layers, avoiding triggers (spicy food, alcohol, caffeine, stress). Regular exercise, which may reduce frequency and severity. Mind-body practices like cognitive behavioral therapy (CBT) and mindfulness.

When to see a doctor

Consult your healthcare provider if hot flashes are significantly disrupting your sleep, work, or quality of life. Also seek medical advice if you experience hot flashes before age 40 (possible early menopause), if flashes are accompanied by unexplained weight loss or other concerning symptoms, or if you want to discuss HRT or other treatment options.

How Menoa helps

Menoa lets you track hot flash frequency and severity daily, helping you identify patterns and triggers. Your MRS score includes hot flash severity, giving you a clinical measure to share with your doctor. The AI companion can spot correlations between your hot flashes and sleep, stress, diet, and medication changes.

Download Menoa
Download the app