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A hot flash is a sudden wave of warmth that usually affects the upper body — especially the face, neck, and chest. You might sweat, feel flushed, or even experience a fast heartbeat. Once it passes, you may feel chilled because your body loses heat quickly.
When hot flashes happen at night, they’re called night sweats. These can disturb your sleep and leave your clothes and sheets damp.
The most common cause is menopause, which is when your menstrual periods become irregular and eventually stop. During this phase, your hormone levels, especially estrogen, drop — which affects how your body controls temperature.
Hot flashes are actually the most common symptom of menopause.
You might experience:
Sudden heat in your chest, neck, or face
Red or blotchy skin
Sweating, especially on the upper body
A racing heartbeat
Chills after the heat fades
A sense of anxiety or unease
Some people experience hot flashes as part of PMS (premenstrual syndrome). This is due to hormonal shifts during your cycle.
These may start earlier than expected — during perimenopause, which can begin in your late 30s or 40s. Perimenopause can last 3 to 10 years, and during this time, you may notice:
Irregular periods
Heavier or lighter bleeding
Spotting between periods
Common triggers include:
Hot weather or heated rooms
Spicy foods
Caffeine and alcohol
Smoking
Tight clothing
Stress
Physical activity that overheats you
At night, your body’s temperature naturally lowers to help you sleep. But hormonal changes can interfere with this, leading to sudden, intense heat and drenching night sweats — which may wake you up and make it hard to fall back asleep.
Yoga
Meditation
Deep breathing
Tai chi
Daily walks
Avoid spicy foods, caffeinated drinks, alcohol, and high-sugar or high-fat diets.
Hot flashes typically begin during perimenopause, when your periods become less regular.
Menopause is confirmed when you go 12 months without a period — usually around age 51.
Hot flashes are most common during the first year after menopause, but they may last 4 to 10 years, and sometimes longer.
Wear light layers that are easy to remove
Sit in a cool room when possible
Avoid triggers like hot drinks, spicy food, and stress
Practice relaxation techniques regularly