Ever walked into a room and forgotten why you went in, struggled to find the right word or found it difficult to concentrate on a simple task? We all have moments like these, but when they happen more often, you might describe the feeling as brain fog.
Brain fog can leave you feeling mentally tired, forgetful or less focused than usual. It isn't a medical diagnosis in itself, but it can be linked to a range of factors, from poor sleep and stress to hormonal changes and certain health conditions. ¹
The good news is that there are practical steps you can take to support your everyday wellbeing. Understanding what might be contributing to brain fog is a helpful place to start.
What Is Brain Fog?
Brain fog is a term used to describe difficulties with thinking, memory and concentration. It can feel as though your thoughts are moving more slowly than usual, making everyday tasks harder to manage. ¹
Common signs of brain fog include:
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Difficulty concentrating: Finding it harder to focus on conversations, work or reading.
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Forgetfulness: Misplacing everyday items or struggling to remember information.
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Slower thinking: Taking longer to process information or make decisions.
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Word-finding difficulties: Knowing what you want to say but struggling to find the right words.
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Mental fatigue: Feeling tired or overwhelmed by tasks that would usually feel manageable.
Symptoms can vary from person to person and may come and go. For some, they are temporary and improve with rest. For others, they may persist and affect daily life, making it important to understand what could be causing them. ¹
What Causes Brain Fog?
There isn't one single cause of brain fog. Several everyday factors and health conditions can contribute to changes in concentration, memory and mental clarity.
1. Poor Sleep and Tiredness
Sleep plays an important role in concentration, memory and how well we function during the day. If you're regularly getting too little sleep or waking up feeling unrested, you may find it harder to think clearly and stay focused.
Ongoing tiredness can have many causes, including disrupted sleep, stress, lifestyle factors and certain medical conditions.
What can help? Try to keep a consistent bedtime and wake-up time, create a relaxing evening routine and give yourself enough time to rest. If you're regularly exhausted despite getting enough sleep, consider speaking to your GP.
2. Stress and Mental Overload
When life feels busy, it can be difficult to switch off. Work pressures, family responsibilities and ongoing worries can all affect your ability to concentrate, particularly when you're trying to juggle several things at once.
Stress can also affect sleep and contribute to tiredness, creating a cycle that makes mental fatigue harder to manage. ¹
What can help? Build short breaks into your day, try relaxation techniques such as meditation or gentle breathing exercises, and focus on one task at a time rather than multitasking.
3. Hormonal Changes During Menopause
Brain fog is a common experience for some women during perimenopause and menopause. You might notice that you're more forgetful, struggle to find words or find it harder to concentrate than you used to.
Hormonal changes can also affect sleep and mood, which may contribute to difficulties with memory and focus. ³
What can help? Prioritise rest, eat a balanced diet and find ways to manage stress. If brain fog is affecting your daily life alongside other menopausal symptoms, a GP can discuss the support and treatment options available.
4. Diet and Hydration
Your brain needs energy and a range of nutrients to function normally. Skipping meals, not eating a varied diet or becoming dehydrated may leave you feeling tired and less able to concentrate.
Some nutrient deficiencies can also cause symptoms such as tiredness and problems with concentration. For example, vitamin B12 deficiency can affect the nervous system, while iron deficiency anaemia can cause fatigue. ⁴ ⁵
What can help? Aim for regular, balanced meals that include vegetables, fruit, wholegrains, protein sources and healthy fats. Drink fluids regularly throughout the day, and avoid assuming that brain fog automatically means you need a supplement.
If symptoms persist, a healthcare professional can help determine whether an underlying deficiency or another health issue may be involved.
5. Illness and Other Health Conditions
Brain fog can occur alongside certain health conditions, including long COVID, and may also be associated with depression, anxiety and other ongoing health problems. ¹ ⁶ Some medicines can contribute to tiredness or difficulties with concentration, too. ²
If your symptoms began after an illness, appeared after starting a new medicine or are becoming more noticeable, it's worth discussing them with a healthcare professional. Don't stop prescribed medication without seeking advice.
6 Ways to Help Manage Brain Fog
Although the right approach depends on what's causing your symptoms, a few everyday habits may help you manage brain fog and make daily tasks feel more manageable.
1. Make Sleep a Priority
Try to establish a regular sleep routine and create a calm environment at bedtime. Limiting late-night screen use and avoiding caffeine close to bedtime may also help if these affect your sleep.
2. Eat a Balanced Diet
Include a variety of foods to help you get the nutrients your body needs. Wholegrains, vegetables, fruit, eggs, beans, nuts, seeds and other protein sources can all form part of a balanced diet.
Nutrients such as vitamin B12 and iron are important for normal body function, but supplements are most useful when they address a genuine dietary need or deficiency. If you're concerned about your intake, speak to a healthcare professional for advice.
3. Stay Hydrated
Keep water nearby and drink regularly throughout the day. Your fluid needs vary depending on your activity, the weather and your health, so pay attention to how you feel and whether you're drinking enough.
4. Take Regular Breaks
Concentrating for long periods can be tiring, especially when you're already experiencing brain fog. Try breaking larger tasks into smaller steps and taking short breaks between them.
If you have more energy at certain times of day, you could plan demanding tasks for those periods and leave simpler activities for when you're feeling less focused. ⁷
5. Keep Moving
Regular physical activity can support general health, sleep and wellbeing. A walk outdoors or another activity suited to your ability can be a useful part of your routine.
If your brain fog is linked to long COVID or another condition that causes symptoms to worsen after exertion, however, exercise may need to be carefully managed with guidance from a healthcare professional. ⁶
6. Use Simple Memory Aids
You don't have to rely on memory alone. Small adjustments can make everyday life easier while you're experiencing brain fog.
Try using a calendar or phone reminders, writing down important information, keeping everyday items in the same place and reducing distractions when you need to concentrate. These practical strategies are also recommended for people experiencing brain fog after long COVID. ⁷
Can Vitamins and Supplements Help With Brain Fog?
You may see vitamins, minerals and other supplements marketed for focus, memory or mental clarity. However, it's important to separate established nutritional roles from claims that a supplement can treat brain fog.
Some nutrients contribute to normal psychological or nervous system function:
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Vitamin B12 contributes to normal psychological function and the normal functioning of the nervous system.
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Vitamin B6 contributes to normal psychological function and the normal functioning of the nervous system.
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Iron contributes to normal cognitive function.
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Magnesium contributes to normal psychological function.
These authorised nutrient claims describe normal body functions. They don't mean that taking extra vitamins or minerals will improve brain fog if you're already getting enough. ⁸
If your diet is limited or you're concerned about a possible deficiency, a suitable supplement may help you meet your nutritional needs. However, persistent brain fog shouldn't be treated with supplements alone. A GP can help identify whether a deficiency, medication or underlying condition may be contributing.
When Should You Speak to a GP About Brain Fog?
Occasional forgetfulness or difficulty concentrating can happen to anyone, particularly when you're tired or stressed. However, it's worth seeking medical advice if your brain fog:
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Isn't improving or keeps returning.
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Is affecting your work, relationships or everyday activities.
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Appears alongside ongoing fatigue or other unexplained symptoms.
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Started after an illness or a change in medication.
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Is causing you concern.
A GP can discuss your symptoms, review your medication and decide whether further assessment or tests may be appropriate. ⁶
Important: Sudden confusion or a sudden change in your ability to speak, understand speech or move normally needs urgent medical attention. If you suspect a stroke, call 999. ⁹
FAQs
Is brain fog a medical condition?
No. Brain fog is a general term for symptoms affecting concentration, memory and thinking rather than a diagnosis in itself. It can have several possible causes, so persistent symptoms may need investigating. ¹
How long does brain fog last?
It depends on the cause. Brain fog associated with a poor night's sleep or temporary stress may improve when the underlying issue resolves. Symptoms linked to menopause, long COVID or another health condition may last longer and need a more individual approach. ¹ ³ ⁶
Can dehydration cause brain fog?
Not drinking enough can contribute to feeling unwell and may affect concentration, particularly if you're becoming dehydrated. Regular fluid intake is a sensible part of looking after your general health, although ongoing brain fog may have another cause.
Does brain fog mean I have a vitamin deficiency?
Not necessarily. Vitamin B12 and iron deficiencies can cause symptoms that include tiredness and, in some cases, problems affecting thinking or concentration. However, brain fog has many possible causes, and symptoms alone cannot confirm a deficiency. ⁴ ⁵
Can brain fog be a symptom of menopause?
Yes. Some women experience forgetfulness, difficulty concentrating and trouble finding words during perimenopause and menopause. Sleep disruption and changes in mood may also play a part. Speak to your GP if symptoms are affecting your quality of life. ³
Brain fog can be frustrating, especially when it makes everyday tasks feel more difficult than they should. While poor sleep, stress, diet and hormonal changes may contribute, persistent symptoms can sometimes point to an underlying health issue.
Start with the basics: prioritise sleep, eat a balanced diet, stay hydrated, take breaks and find practical ways to manage your day. If brain fog continues, gets worse or affects your daily life, speak to your GP rather than trying to manage it with supplements alone.
Looking after your overall wellbeing is a good starting point, but understanding the cause is the best way to find the right support.
