What is brain fog?

Many women reaching midlife find themselves reaching for a word that’s on the tip of their tongue or wondering why they just walked into a room. If this sounds familiar, you aren’t alone. These cognitive changes are a widely documented part of the menopause transition (MT).

While these moments can be frustrating or even frightening, understanding what is happening in your brain can help normalise the experience.

What is menopause brain fog?

Brain fog is not a formal medical diagnosis but rather a constellation of cognitive symptoms that many women experience during perimenopause and menopause. Experts define cognition as all forms of "knowing and awareness", including remembering, perceiving, and problem-solving.

When this "fog" rolls in, it often disrupts these everyday mental processes, leading to a noticeable dip in mental clarity.

Brain fog can show up in several different ways. According to the sources, women frequently report:

• Memory Lapses: Difficulty recalling words, names, stories, or numbers.

• Attention Issues: Losing a train of thought, being easily distracted, or feeling "absent-minded".

• Forgetfulness: Misplacing everyday items like keys or forgetting appointments and events.

• Executive Challenges: Difficulty switching between different tasks or forgetting the "reason for coming into a specific room".

• ADHD-like Symptoms: Some women experience a new onset of symptoms similar to attention deficit hyperactivity disorder.

Why do women feel it during menopause?

The primary driver of these changes is the fluctuating and declining levels of estradiol (E2), a form of estrogen. The brain is packed with estrogen receptors, particularly in areas such as the hippocampus, which supports memory. When estrogen levels fluctuate and eventually drop, it can directly impact how these brain regions function and as a consequence the cognitive functions they support.

However, hormones aren't the only factor. Other menopause symptoms (also driven by fluctuating hormones) often "tag-team" to make brain fog worse:

• Vasomotor Symptoms (VMS): Frequent hot flushes (referred to as hot flashes in the sources) are strongly linked to memory difficulties.

• Sleep Disturbances: Poor sleep is a common culprit for trouble with verbal learning and memory.

• Mood Changes: Symptoms of anxiety and mood volatility, which can spike during the transition, are also linked to cognitive complaints.