[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/share-dev.upmc.com\/2025\/11\/brain-fog-causes\/#Article","mainEntityOfPage":"https:\/\/share-dev.upmc.com\/2025\/11\/brain-fog-causes\/","headline":"What Causes Brain Fog and How Can you Clear It?","name":"What Causes Brain Fog and How Can you Clear It?","description":"<p><\/p>","datePublished":"2025-11-11","dateModified":"2025-11-11","author":{"@type":"Organization","@id":"https:\/\/www.upmc.com\/","name":"UPMC","url":"https:\/\/www.upmc.com\/","sameAs":"https:\/\/share-dev.upmc.com\/upmc\/","parentOrganization":"UPMC"},"publisher":{"@type":"Organization","name":"UPMC HealthBeat","logo":{"@type":"ImageObject","@id":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2019\/04\/UPMC-HealthBeat-Logo.png","url":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2019\/04\/UPMC-HealthBeat-Logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2025\/10\/GettyImages-827891554-e1762872781540.jpg","url":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2025\/10\/GettyImages-827891554-e1762872781540.jpg","height":866,"width":2000},"url":"https:\/\/share-dev.upmc.com\/2025\/11\/brain-fog-causes\/","about":["Family Health","Health Topics A-Z"],"wordCount":1083,"articleBody":"If you\u2019ve ever had trouble focusing, felt forgetful, or couldn\u2019t think clearly, you\u2019ve probably experienced brain fog. It\u2019s not a medical diagnosis, but it\u2019s a real symptom. Brain fog affects your cognitive function \u2014 how well your brain works \u2014 and can make daily tasks feel more complicated than usual.Brain fog has many possible causes, from stress and poor sleep to hormone changes or illness. In many cases, simple changes to your daily habits can help you feel better and think more clearly.What Is Brain Fog?Brain fog is a way to describe feeling mentally \u201coff.\u201d People often say it feels like their thinking is slower, foggy, or harder to focus.Common symptoms include:Feeling mentally tired.Forgetting things easily.Slower thinking or reaction time.Struggling to find the right words.Trouble concentrating.Brain fog can happen to both teens and adults. It is often temporary. If it lasts a long time, it could be a sign that your brain or body needs support.What Causes Brain Fog?Brain fog is usually a symptom of something else \u2014 often caused by problems with sleep, stress, hormones, diet, or even illness.Chronic stressWhen you\u2019re stressed for a long time, your body makes more of a hormone called cortisol. Too much cortisol can affect memory, focus, and mood. Stress can also cause neuroinflammation \u2014 swelling in the brain that slows down how well it works.Poor sleep hygiene or sleep disordersYour brain needs sleep to rest, repair, and process information. If you don\u2019t get enough sleep \u2014 or if the sleep you get isn\u2019t good quality \u2014 brain fog is more likely. Staying up late, using screens at night, or sleeping in a noisy room can all hurt your sleep hygiene. Conditions like sleep apnea or insomnia can make it worse.Nutrient deficienciesYour brain needs specific vitamins and minerals to work properly. If you don\u2019t get enough, your brain may feel tired or slow.Some common vitamin deficiencies linked to brain fog include:Iron \u2014 Without enough iron, your brain doesn\u2019t get enough oxygen, which can cause tiredness and poor focus.Omega-3 fats \u2014 These healthy fats support brain health and mood.Vitamin B12 \u2014 Low levels can cause confusion and memory problems.People with limited diets, food allergies, or digestion challenges may be at risk.Hormonal imbalanceHormones like estrogen, progesterone, testosterone, and thyroid help your brain stay sharp. When these levels shift \u2014 such as during menopause, pregnancy, or if you have thyroid disease \u2014 brain fog can happen. Low estrogen or thyroid hormones, for example, can make you feel forgetful or mentally drained.DehydrationYour brain is mostly water. Even being slightly dehydrated can make you feel foggy or tired. Not getting enough fluids or losing fluids from heat, illness, or exercise can cause an electrolyte imbalance, which affects brain function.Blood sugar swingsWhen you consume a lot of sugar or skip meals, your blood sugar levels fluctuate rapidly. These swings can leave you feeling shaky, tired, or unable to focus. Over time, problems with blood sugar control \u2014 like in prediabetes or diabetes \u2014 can lead to more serious brain fog.Medications and health conditionsSome medications can cause brain fog as a side effect. These include antihistamines, antidepressants, sedatives, or chemotherapy drugs.Certain medical conditions can also affect your brain, including:Anxiety or depression.Autoimmune diseases (like lupus or multiple sclerosis).Chronic fatigue syndrome.Fibromyalgia.Lyme disease.These conditions may affect brain fog through inflammation, pain, or low energy.Post-viral brain fog and long COVIDMany people report brain fog after being sick, especially after COVID-19. Long COVID symptoms may include memory problems, trouble focusing, or feeling mentally slow. Experts believe this may be due to leftover inflammation or changes in brain activity after the illness.Environmental toxinsChemicals in the environment \u2014 such as mold, heavy metals (like lead or mercury), and air pollution \u2014 may affect brain health in some people. This is more likely in people who are sensitive to toxins or have trouble getting rid of them.Natural Ways to Get Rid of Brain FogIf you want to clear brain fog, improving your diet and lifestyle are great places to start.Here are some tips to clear the fog naturally:1. Get better sleepAim for seven to nine hours each night.Avoid caffeine and alcohol late in the day.Go to bed and wake up at the same time every day.Keep screens and bright lights out of the bedroom.Make your room calm, dark, and quiet.2. Reduce stressDo deep breathing, meditation, or gentle stretching.Set limits on work or screen time.Spend time outside or walking.Take short breaks during the day.3. Eat brain-friendly foodsAdd omega-3 fats from fish, walnuts, or chia seeds.Choose colorful fruits and vegetables rich in antioxidants.Eat less sugar and processed food.Focus on lean proteins to balance blood sugar.4. Drink waterStaying hydrated helps you stay alert. Aim to drink water throughout the day. If you feel thirsty or tired, drink more \u2014 especially in hot weather or after activity.5. Move your bodyExercise sends more blood and oxygen to your brain. It also helps reduce stress. Even 20 minutes of walking, stretching, or dancing can help lift brain fog.6. Support gut healthAvoid processed foods or unnecessary antibiotics.Eat more fiber.Try fermented foods like yogurt, kefir, or sauerkraut.When to See a Doctor for Brain FogTalk to a doctor if you:Can\u2019t focus or remember things for weeks.Feel confused, numb, or off balance.Still feel foggy weeks after recovering from an illness.Struggle to do daily tasks.Brain fog is frustrating. However, it&#8217;s your brain\u2019s way of telling you something\u2019s wrong. It could be due to stress, poor sleep, poor diet, or something more profound.The good news is that many natural changes can boost mental clarity and reduce fatigue and forgetfulness.SourcesChristina van der Feltz-Cornelis, Fidan Turk, Jennifer Sweetman, Kamlesh Khunti, Mark Gabbay, Jessie Shepherd, Hugh Montgomery, W. David Strain, Gregory Y.H. Lip, Dan Wootton, Caroline Leigh Watkins, Daniel J. Cuthbertson, Nefyn Williams, Amitava Banerjee. General Hospital Psychiatry. Prevalence of mental health conditions and brain fog in people with long COVID: A systematic review and meta-analysis. Accessed August 2025. Link. https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0163834324000392 Peter Denno, Sijia Zhao, Masud Husain, Adam Hampshire. Trends in Neurosciences. Defining brain fog across medical conditions. Accessed August 2025. Link. https:\/\/www.cell.com\/trends\/neurosciences\/fulltext\/S0166-2236(25)00017-7 "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"2025","item":"https:\/\/share-dev.upmc.com\/2025\/#breadcrumbitem"},{"@type":"ListItem","position":2,"name":"11","item":"https:\/\/share-dev.upmc.com\/2025\/\/11\/#breadcrumbitem"},{"@type":"ListItem","position":3,"name":"What Causes Brain Fog and How Can you Clear It?","item":"https:\/\/share-dev.upmc.com\/2025\/11\/brain-fog-causes\/#breadcrumbitem"}]}]