Have you ever felt as though your thinking is slow or unclear? You may be experiencing what is commonly referred to as brain fog. Although it is not a formal medical or scientific diagnosis, the term is used to describe a temporary state of reduced mental clarity and cognitive sharpness.
The rise of hustle culture, marked by long hours and constant productivity demands has increased awareness of the mental strain that often accompanies overwork. Brain fog has also been widely reported during recovery from COVID-19. In addition, menopause-related brain fog can make it harder to concentrate or recall recently learned information, such as a person’s name. Fatigue and certain medical conditions or treatments, including cancer and chemotherapy, may also contribute to cloudy thinking and cognitive difficulties.
As research into brain fog continues to grow, scientists are working to better define and understand this broad and often misunderstood experience. Read on to learn more about its symptoms, causes, and potential ways to manage it.
Definition of Brain Fog
Brain fog is not a condition that doctors formally diagnose.
“Brain fog is a broad, nonmedical term used to describe a range of cognitive symptoms people commonly experience,” explains Shehroo Pudumjee, PhD, a neuropsychologist at the Cleveland Clinic Lou Ruvo Center for Brain Health in Las Vegas. These symptoms can vary but generally reflect a sense that thinking, memory, or mental processing is not as sharp or efficient as it once was.
Potential Signs and Symptoms of Brain Fog
According to Doctors, brain fog often presents as “cognitive inefficiencies,” meaning it becomes harder to access and use your mental resources as effectively as you once did.
You may notice challenges with:
Attention
Concentration
Learning
Short-term memory
The experience of brain fog can vary from person to person, but common signs may include the following,
Difficulty multitasking
Increased trouble understanding new concepts or learning information
Frequently having words “on the tip of your tongue”
Feeling as though you are in a dreamlike or trancelike state
Entering a room and forgetting why you went there
Forgetting details from recent conversations
Difficulty absorbing or retaining information
Becoming easily distracted or pulled off task
Doctors also note that many patients describe an overall sense of mental sluggishness. In one study analyzing how the term “brain fog” is used in Reddit posts, individuals described their experience using terms such as dissociation, fatigue, forgetfulness, and increased mental effort. Together, these symptoms can create the sensation that your thinking feels slow or cloudy.
Possible Causes of Brain Fog
One of the difficulties in understanding brain fog is that it can stem from many different underlying factors. The term itself is broad and does not pinpoint a specific medical issue, which can make it challenging for doctors to determine exactly what is happening.
That said, several common causes are often associated with brain fog and are worth considering.
Hormonal Changes
Hormonal shifts during pregnancy and menopause can both contribute to brain fog. Research shows that many pregnant individuals report feelings of confusion, disorientation, and mental fogginess. These symptoms may lead to behaviors such as placing items in unusual locations, misplacing belongings, or forgetting routine work tasks, an experience often referred to as “pregnancy brain.
Brain fog is also common during menopause. Research suggests that memory difficulties can begin early in the menopausal transition and may continue into post menopause, likely due to changes in estrogen levels and their impact on memory and cognitive performance.
Diet Challenges
Dietary factors can play a role in the development of brain fog. According to doctors, following a highly restricted diet or failing to consume adequate vitamins and minerals may contribute to cognitive symptoms. In particular, deficiencies in vitamin B12 or iron can lead to anemia, which may reduce energy levels and indirectly impair cognitive function.
Food allergies and sensitivities may also affect mental clarity. Certain individuals experience changes in cognitive performance in response to specific foods. Supporting this, a survey by Beyond Celiac, an advocacy and research organization for celiac disease, found that 95 percent of people with nonceliac gluten sensitivity reported experiencing brain fog.
Medications
Some medications may contribute to brain fog as a side effect. For example, topiramate (Topamax)—a drug sometimes prescribed for migraine and more commonly used to prevent seizures, can cause mental cloudiness. Some doctors warn patients that it may lead to foggy thinking, confusion, and difficulty finding words.
Taking multiple medications at the same time, a situation known as polypharmacy, may also increase the risk of cognitive side effects. While individuals respond differently to medications, noticing new or worsening brain fog after starting a drug is a reason to speak with a doctor or pharmacist about potential cognitive effects. Patients should never stop taking prescribed medications without first consulting a healthcare professional.
Long-term use of certain anti-anxiety medications, such as alprazolam (Xanax) and diazepam (Valium), has also been linked to brain fog. As people age, the body becomes less efficient at metabolizing these drugs, which can increase the likelihood of cognitive symptoms, even if the medication was previously well tolerated.
Chemotherapy
“Chemo brain” is a widely recognized term describing cognitive difficulties experienced before, during, and after cancer treatment, according to the National Cancer Institute. This type of brain fog can result from the cancer itself, cancer-related conditions such as depression or sleep disturbances, or various treatments including chemotherapy, radiation, and hormone therapy.
Certain Medical Conditions
Brain fog can also be linked to a variety of medical conditions. According to doctors, it may appear in people with postural orthostatic tachycardia syndrome (POTS), anemia, diabetes, depression, anxiety, and autoimmune disorders such as multiple sclerosis, chronic fatigue syndrome, celiac disease, and lupus.
One particularly common condition associated with cognitive difficulties is hypothyroidism, or an underactive thyroid, which affects about 5 percent of Americans over the age of 12. Research shows that fatigue, depression, and problems with memory and executive function are often among the earliest signs of hypothyroidism.
COVID-19
COVID-19 can lead to lingering issues with attention, concentration, and memory after infection, according to the National Institutes of Health (NIH). Research suggests that inflammation in the brain may alter the function of brain cells, contributing to these cognitive difficulties.
One study found that 7.2 percent of individuals with long COVID reported experiencing brain fog. This symptom was more common among women, people with preexisting respiratory conditions, and those who experienced more severe cases of COVID-19.
Mild Cognitive Impairment vs. Brain Fog
Mild cognitive impairment (MCI) is an early stage of memory loss and is not the same as brain fog. According to the National Institute on Aging, roughly 10 to 20 percent of people aged 65 and older with MCI develop dementia within a year. Ongoing studies are exploring why some individuals with MCI progress to dementia while others do not.
The key difference between MCI and brain fog lies in the scope and impact of cognitive changes. Cognitive impairment associated with dementia affects more than just memory and often involves functional and behavioral changes. Early signs may include difficulty managing finances despite previous competence, failing to recognize social norms, challenges completing familiar tasks, or problems with spatial awareness, such as getting lost.
While MCI can progress to dementia, brain fog does not typically lead to dementia.
Lifestyle Changes and Treatment for Brain Fog
If brain fog lasts more than a couple of weeks, advise consulting your doctor. Feeling mentally cloudy occasionally is normal, especially when you’re overextended, but if it begins to affect your quality of life, professional guidance is important.
During an evaluation, your doctor may take a detailed medical history, order blood tests, and ask about your lifestyle habits including physical activity, diet, stress management, and sleep. Addressing any underlying medical conditions that could impact cognitive function is a key step in managing brain fog.
In addition to medical care, experts recommend several lifestyle strategies that may help improve mental clarity and reduce brain fog.
Exercise Regularly
Staying active can help sharpen your mind and improve overall cognitive function. Aim for about 150 minutes of moderate-intensity physical activity per week, even walking counts. Doctors say that exercise stimulates the brain and also helps you sleep better at night.
Sleep Well
Getting sufficient, consistent sleep is crucial for mental clarity. Doctors recommend at least seven hours of sleep per night and keeping a regular sleep schedule. Doctors say, Go to bed and wake up at the same time each day. Skipping sleep to finish work or binge-watch shows may seem productive, but it can actually reduce efficiency the next day. Sleep should be a priority for everyone.
Manage Your Stress
Choose a stress-management strategy that works best for you. This could include morning walks with a neighbor, weekend hikes in nature, practicing deep breathing, reading for pleasure, picking up a new hobby, or enjoying your favorite TV shows. Taking longer breaks or scheduling more vacation time can also boost focus and overall well-being, according to research.
“We have a primitive brain and a more advanced brain. When chronic stress dominates, the primitive brain takes over, limiting our ability to use higher-level thinking,” explains doctors. Learning to manage stress helps keep your brain functioning at its full cognitive potential.
Try Cognitive Therapies
Mindfulness practices, focusing on the present moment and concentrating on a single task have been linked to stress reduction, decreased depression, and relief from menopausal symptoms, all of which can help reduce brain fog.
Engaging in activities that challenge your brain, such as reading, doing crossword puzzles, playing games or musical instruments, can stimulate cognitive function and support mental clarity.
Take Nutrition and Diet Into Account
Inflammation is believed to contribute to brain fog, and an anti-inflammatory diet may help counteract these effects. This involves limiting or avoiding highly processed foods and processed meats. Instead, focus on a plant-based or Mediterranean-style diet rich in whole grains, fruits, vegetables loaded with antioxidants, and healthy fats such as omega-3 fatty acids.
Moderate Caffeine and Alcohol
Including caffeine or alcohol in your routine is a personal choice, but it’s important to be mindful of how much and when you consume these beverages. Research suggests that moderate coffee intake is associated with a reduced risk of cognitive decline and Parkinson’s disease. However, consuming caffeine too late in the day can disrupt sleep.
If you drink alcohol, stick to moderate consumption. The Centers for Disease Control and Prevention (CDC) recommends no more than one drink per day for women and two drinks per day for men. Exceeding these limits can be harmful to brain health, and drinking alcohol before bedtime can reduce sleep quality.
Stay Connected
Humans are inherently social creatures. Social disconnection can contribute to depression, which in turn may worsen brain fog. A study of over 66,000 people found that those who were most mentally fit had both strong social connections and active engagement in social activities. Prioritize friendships and spend quality time with loved ones regularly to support both mental and cognitive health.
Conclusion
Brain fog, that fuzzy, unclear feeling when your thinking isn’t at its best, is not a formal medical term, but researchers are increasingly studying it to understand its causes and effects. Factors such as stress, hormonal changes, diet, sleep quality, medical conditions, and certain medications can all contribute to this temporary cognitive state.
If you find yourself struggling with mental sluggishness, there are effective ways to manage brain fog through lifestyle changes, cognitive exercises, and targeted therapies, helping you regain focus and mental clarity.