What Causes Hot Flashes and Night Sweats During Menopause?

Hot flashes and night sweats are among the most common and disruptive symptoms of menopause. They are caused by fluctuating and declining levels of estrogen, a hormone that plays a key role in regulating body temperature. As estrogen drops, the part of the brain that controls temperature—called the hypothalamus—becomes more sensitive to even small changes in body heat.

When the brain mistakenly senses that the body is overheating, it triggers a response to cool down. This leads to a sudden rush of heat, usually in the upper body, face, and chest, often accompanied by redness, sweating, and a rapid heartbeat. These episodes can last from a few seconds to several minutes and may occur multiple times a day.

When hot flashes happen during sleep, they are known as night sweats. They can cause interrupted sleep, waking with soaked clothing or bedding, and persistent fatigue. Night sweats can make it difficult to get restorative rest, which in turn can affect mood, memory, and overall quality of life.

Hot flashes and night sweats may last for several years, especially in the early stages of menopause and during perimenopause. Triggers can include stress, spicy foods, caffeine, alcohol, and warm environments.
While these symptoms are a normal part of menopause for many women, they can vary in intensity. Mild episodes may be managed with lifestyle changes, while more severe cases may require hormone therapy or non-hormonal medications, depending on individual health factors.