What Are the First Signs and Symptoms of Perimenopause?

The first signs of perimenopause can vary widely, but the most common early symptom is a change in menstrual cycle patterns. Periods may become irregular—shorter, longer, heavier, or lighter—and the time between cycles may change. These changes are due to fluctuating levels of estrogen and other hormones as the ovaries begin to slow down.

One of the earliest and most noticeable symptoms is hot flashes, often described as sudden waves of heat in the face, neck, or chest, sometimes accompanied by sweating and a rapid heartbeat. Night sweats, which are hot flashes that occur during sleep, can lead to interrupted rest and fatigue during the day.

Other early symptoms include mood swings, increased anxiety or irritability, and difficulty concentrating. Some women report feeling more forgetful or mentally foggy. Breast tenderness, vaginal dryness, and decreased libido may also begin during this phase.

Sleep disturbances are common, even in women who have never had issues with sleep before. This can be due to hormonal shifts or the discomfort of night sweats.

Some women also experience weight gain, particularly around the abdomen, or worsening of premenstrual symptoms they had earlier in life. These signs often appear gradually and can sometimes be mistaken for stress or aging.

Recognizing these early symptoms helps women understand that perimenopause has begun and allows them to make informed decisions about managing their health and well-being. If symptoms become disruptive, medical advice may help guide the next steps.