Brain Fog and Memory Changes During Perimenopause: Why You Feel Forgetful and What Helps
By DR Saleem Khan
Consultant Gynaecologist
MBBS,DOWH,MRCOG, Dip Psy-sextherapy, FRCOG
Have you ever walked into a room and forgotten why you went there?
Lost your train of thought mid-conversation?
Forgotten a name, appointment, or password that should have been easy to remember?
If so, you’re not alone.
Brain fog is one of the most common symptoms of perimenopause, yet many women are unprepared for it. For some, it can be frustrating and even frightening, particularly when they have always considered themselves organised, productive, and mentally sharp.
The good news? In most cases, perimenopausal brain fog is a normal response to hormonal changes and does not mean you are developing dementia.
What Is Perimenopause Brain Fog?
Brain fog is a term used to describe changes in memory, concentration, and mental clarity.
Common symptoms include:
- Forgetfulness
- Difficulty concentrating
- Trouble finding words
- Mental fatigue
- Reduced focus
- Difficulty multitasking
- Feeling mentally “slower” than usual
These symptoms often begin during perimenopause when hormone levels start to fluctuate.
Why Does It Happen?
Oestrogen does much more than regulate the menstrual cycle. It also supports areas of the brain involved in:
- Memory
- Learning
- Attention
- Mood
- Sleep
- Neuroplasticity (the brain’s ability to adapt and form new connections)
As oestrogen levels fluctuate, communication between brain cells becomes less efficient, making memory and concentration feel more challenging.
However, hormones are only part of the story.
Other Factors That Can Worsen Brain Fog
- Poor sleep
- Night sweats
- Anxiety
- Stress
- Low mood
- Vitamin deficiencies (B12, Vitamin D, Iron)
- Lack of physical activity
Many women find that improving these factors significantly improves their cognitive symptoms.
Is Brain Fog Permanent?
Fortunately, no.
Research suggests that menopause-related cognitive changes are usually temporary and often improve as hormone levels stabilise after menopause.
Brain fog is not the same as dementia.
Most women experience difficulties with attention and processing speed rather than true memory loss.
What Can You Do About It?
1. Prioritise Sleep
Sleep is one of the most powerful tools for brain health.
Try to:
- Keep regular sleep hours
- Reduce caffeine after midday
- Limit alcohol
- Avoid screens before bed
- Keep your bedroom cool and dark
Even small improvements in sleep can have a significant impact on concentration and memory.
2. Move Every Day
Exercise improves blood flow to the brain and supports neuroplasticity.
Aim for:
- Daily walking
- Strength training 2–3 times weekly
- Yoga or Pilates
- Moderate cardiovascular exercise
Regular movement benefits both brain health and mood.
3. Eat for Cognitive Health
Focus on:
Omega-3 fats
- Oily fish
- Walnuts
- Chia seeds
Antioxidant-rich foods
- Berries
- Leafy greens
- Colourful vegetables
Protein
- Eggs
- Fish
- Poultry
- Legumes
A balanced diet provides the nutrients your brain needs to function optimally.
4. Reduce Mental Overload
Many women are carrying an enormous mental workload.
Instead of relying on memory alone:
- Use calendars
- Create to-do lists
- Set reminders
- Reduce multitasking
- Break large tasks into smaller steps
Working smarter often reduces cognitive fatigue.
Neurobics: A Workout for Your Brain
Neurobics are simple activities designed to stimulate new neural pathways by doing everyday tasks differently.
Examples include:
- Brushing your teeth with your non-dominant hand
- Taking a different route to work
- Rearranging your daily routine
- Identifying objects by touch
- Learning a new skill or language
These activities challenge the brain and encourage neuroplasticity.
Other Brain-Boosting Activities
Keep your brain active with:
- Reading
- Crossword puzzles
- Sudoku
- Strategy games
- Learning a musical instrument
- Dancing
- Creative hobbies
The key is variety and continual learning.
Can HRT Help?
Some women find that cognitive symptoms improve when menopause-related symptoms such as poor sleep, anxiety, and hot flushes are effectively treated.
Hormone Replacement Therapy (HRT) may help some women, but it is not currently recommended solely as a treatment for memory problems. Decisions about HRT should always be discussed with a qualified healthcare professional.
When Should You Seek Medical Advice?
Speak to a healthcare professional if:
- Symptoms are affecting daily life
- Memory problems are worsening rapidly
- You are concerned about dementia
- You experience severe mood changes
- You suspect nutritional deficiencies or other health issues
Conditions such as thyroid disorders, anaemia, sleep apnoea, and depression can sometimes mimic menopausal brain fog.
The Bottom Line
Brain fog during perimenopause is common, real, and often manageable.
Hormonal fluctuations, poor sleep, stress, and lifestyle factors all contribute to cognitive changes during this stage of life. The encouraging news is that the brain remains adaptable throughout life.
By improving sleep, exercising regularly, supporting good nutrition, reducing stress, and engaging in brain-stimulating activities such as neurobics, many women notice significant improvements in focus, memory, and mental clarity.
You are not losing your mind—your brain is adapting to a new hormonal environment, and with the right support, it can thrive.
References
- The Menopause Society. Cognitive Changes and Menopause.
- National Institute on Aging. Menopause and Brain Health.
- National Health Service. Menopause Symptoms and Management.
- Maki PM, Jaff NG. Brain Fog in Menopause: A Health-Care Professional’s Guide for Decision-Making and Counseling on Cognition. Menopause. 2022.
- Greendale GA, Karlamangla AS, Maki PM. The Menopause Transition and Cognition. Journal of the American Medical Association (JAMA). 2020.
- Katz LC, Rubin M. Keep Your Brain Alive: 83 Neurobic Exercises to Help Prevent Memory Loss and Increase Mental Fitness. Workman Publishing.