Have you noticed yourself starting a sentence only to lose your train of thought halfway through? Or walked into a room and suddenly forgot what you needed? 

These are moments of brain fog. They can feel frustrating, confusing, and sometimes even a little scary. You might wonder if something is wrong—or if this is just your “new normal.”

The truth is, brain fog is very common and is caused by a mix of factors. For example, hormones play a role, but sleep, stress, and overall health also affect how your brain works every day.

What is brain fog in menopause and perimenopause?

Brain fog is not a medical diagnosis. It’s a group of symptoms that affect how well your brain works.

You might notice you have trouble focusing, you forget things more often, or have difficulty finding the right words. All of these are experiences of brain fog. 

These changes can feel subtle at first, but over time, they can mess with work, relationships, and daily life. Many women say they feel “off” or “not like themselves.” 

Brain fog can happen at any age, but it’s especially common during perimenopause and menopause. (Watch now: Lost your words? How to beat menopause brain fog)

What causes brain fog during perimenopause and menopause?

Your brain depends on many systems in your body working together. When something is out of balance, your brain often feels it first.

Brain fog usually has multiple causes. That is why brain fog feels different from person to person—and why it can change over time.

The rest of the article will cover the following common causes of brain fog:

• Hormonal imbalance
• Poor, interrupted sleep
• Nutrition, vitamin and mineral deficiencies
• Stress and mental health

Brain fog is also linked to thyroid disorders, poor regulation of blood sugar, autoimmune conditions, high blood pressure, and pregnancy or postpartum changes. Because there are so many possible causes, providers need to look at the full picture and treat the right thing.

How hormonal imbalance contributes to brain fog

Brain fog can happen at any time, but it’s especially common during perimenopause, when estrogen levels go up and down. To understand why, it helps to know how the hormone estrogen supports the brain.

There are estrogen receptors all over your body. They are places in cells where estrogen connects. These receptors are also found in parts of the brain that control memory, focus, decisions, and emotions. When estrogen connects to these receptors, it helps brain cells communicate and keeps your brain working well over time.

During perimenopause and menopause, estrogen becomes out of balance. As a result, these helpful effects begin to fade. Brain signals may not work as smoothly, leading to forgetfulness and trouble focusing.

It’s important to remember we are talking about estrogen balance. Your provider should work with you to determine if your brain fog is caused by too much or too little estrogen. 

How sleep contributes to brain fog

One of the most important things you can do to decrease brain fog is to focus on getting good sleep. When you sleep, your brain clears out waste. You get a little reset, like turning it off and on again. 

Sleep disturbances are common as you get older. When sleep is disrupted, it can make brain fog worse and harder to manage. 

Making sure you get regular, deep sleep is one of the best ways to address brain fog. Regular, deep sleep helps your long-term memory, promotes strong communication between different parts of the brain, and charges your battery. 

If you feel like you’ve “tried everything” to improve your sleep and nothing seems to be working, it may be time to talk to a provider about how to address your sleep problems. 

What you eat also impacts memory and focus 

To keep your body working, your brain needs steady fuel and the right nutrients. Have you ever skipped lunch because you were too busy, only to make a silly mistake? That’s an example of brain fog. 

When blood sugar levels are too low, your brain doesn’t get enough energy. On the other hand, when blood sugar levels are too high over time, this can damage blood vessels in the brain, which also contributes to brain fog. 

You want to make sure you are eating balanced meals regularly to stay sharp, but there are other problems to watch out for. Common nutrition problems that can cause brain fog include low iron, not eating enough protein, and not drinking enough water.

Iron deficiency is very important to know about. About 30% of women do not have enough iron. It’s best to get iron from food, not just pills. Foods with a lot of iron include red meat, salmon, whole grains, and green vegetables.

It’s important to work with a provider to gain a deeper understanding of what your body needs, so you can adjust your nutrition to support it. Some people need an anti-inflammatory diet, others a low-acid diet, etc. It’s about working with someone to find what’s the right change to make to your diet to get you feeling like yourself again. 

Effects of stress and mental health on brain fog 

Getting older can be difficult and can bring up lots of emotions, especially if you feel like your brain is slow to learn, remember, or process things. 

Using tools to stay organized or writing down a to-do list instead of trying to keep it all in your head can help reduce stress and prevent feeling overwhelmed. These activities can help reduce your mental workload so you can focus your energy where you need it most.

It’s easier said than done, but reducing stress is so important for your overall health and for overcoming brain fog. Focus on mindfulness, deep breathing, finding the things that bring you joy, and not overextending yourself. Create a self-care routine that helps you de-stress and relax. Try not to put too much pressure on these changes; it's what you want and need. With the right steps, you can change your brain for the better. 

If you are someone who struggles with their mental health, you are likely to experience brain fog. Anxiety and depression, and the medications used to treat them, directly affect how your brain works, potentially leading to trouble concentrating, slower thinking, and mental fatigue. 

Finally, and perhaps most importantly, seek help for your mental health. There is no shame in getting help, and you are not alone. Perimenopause and menopause are significant and difficult transitions, both emotionally and physically. It’s important to acknowledge this and give yourself grace.

Getting relief from brain fog 

Many women worry about what brain fog means. Here’s what it does not mean. Brain fog is not dementia. Brain fog is not permanent. There are many ways to improve brain fog. The key is addressing the right factors. That looks like taking a whole-person approach.

Address underlying health conditions

If you have brain fog, a Visana provider will check for possible health problems like low iron, sleep issues, thyroid problems, blood sugar or diet issues, and mental health concerns. Finding the root cause and treating it alone can directly reduce brain fog.

Add in lifestyle changes

These are often the most powerful lifestyle changes for combatting brain fog. Even small changes in these areas can make a meaningful difference:

1. Sleep: Aim for regular, deep sleep
2. Movement: Exercise increases blood flow to the brain and supports brain health
3. Stress management: Try journaling, breathing exercises, or meditation
4. Nutrition: Focus on enough protein, hydration, and key nutrients like iron

Increase blood flow to the brain to fight brain fog 

When you don’t move your body often, brain fog can get worse. As blood flow to the brain slows down, sleep problems start, and stress levels stay high. This can make you feel forgetful, tired, and unable to focus. 

Exercise is one of the best ways to improve brain function. It helps blood flow to the brain, supports mood and memory, and helps balance hormones. It also improves sleep and lowers anxiety, which both affect how clearly you think. 

You don’t need intense workouts. Simple, regular movement like walking, strength training, or short workouts can make a real difference.

Over time, exercise starts to feel less like a chore and more like a way to feel better. Many women notice clearer thinking, more energy, and better focus once they find a routine that works for them. With the right support and consistency, small changes can lead to real relief and help you feel like yourself again.

Where Hormone Therapy Fits

For women in perimenopause and menopause, menopause hormone therapy (MHT) can be helpful if addressing the root causes of underlying conditions does not improve symptoms. 

MHT may support brain function and improve sleep and mood; however, it is not the only treatment. It works best as part of a broader plan that also includes lifestyle changes.

When to Talk to a Provider

It may be time to seek care if:

• Brain fog is not improving
• It is affecting your daily life
• You also have fatigue, weight changes, or mood symptoms

Seek emergency in-person care if brain fog happens with:

• Severe headache
• Vision changes
• Weakness or trouble speaking

How Visana Can Help

You don’t have to figure this out on your own.

Many women are told their symptoms are “just stress” or “just hormones,” leading to frustration. At Visana, care is different. The focus is on understanding the root cause.

Schedule a visit with a Visana provider to understand what’s causing your brain fog and get a personalized plan that helps you feel better, think clearly, and move forward with confidence.