We all have moments when it’s difficult to focus, but for people with lupus, brain fog can be an ongoing symptom.

Brain fog, also called lupus fog, is an umbrella term for a wide range of symptoms that affect cognition. It can come and go at any time and can significantly impact your quality of life.

We put together this guide on lupus brain fog, looking closely at what it means for different people, its possible causes, and things you can do to help manage it.

Let’s get into it.

What is lupus?

Lupus, also known as systemic lupus erythematosus (SLE), is an autoimmune condition.

In people with lupus, the immune cells mistakenly target and attack healthy organs and tissues in the body, which causes a variety of symptoms. If it’s not managed effectively, lupus can cause serious health complications over time.

Because SLE is systemic, symptoms often impact multiple areas of the body, including the skin, blood vessels, joints, kidneys, heart, lungs, and brain.

The severity and frequency of lupus symptoms vary from person to person. Most people with lupus find their symptoms get worse during “flares,” when the immune system becomes more active.

Understanding lupus brain fog

Brain fog, sometimes referred to as lupus fog, is a cognitive symptom that as many as 70–80% of people with lupus experience.

It can persist for years, but like other lupus symptoms, it often worsens during active flare-ups. The effects can vary from day to day.

Brain fog can be frustrating for people with lupus as there’s no universal definition. But some of the most common symptoms include:

• Difficulty thinking clearly
• Struggling with long and short-term memory
• Confusion
• Difficulty focusing
• Only being able to focus on one thing at a time
• Struggling to keep up with conversations
• Needing to reread things multiple times to understand them
• Taking longer than usual to solve problems

Research published in 2023 found that, rather than one specific issue, brain fog is often a broad, hard-to-pin-down experience that can include things like mental fatigue, difficulty concentrating, and feeling “slowed down.”

In the study, some people described it as feeling “foggy,” “out of it,” or as if their mind suddenly went blank. Others said they don’t experience clear cognitive problems at all, but still feel mentally “off.”

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Diagnosing lupus brain fog

Researchers still don’t know what causes lupus brain fog. Some research suggests that it’s related to other symptoms, like lack of sleep or chronic pain. It’s thought that others develop brain fog because of nervous system inflammation.

Despite this uncertainty, brain fog is still something you can and should see your doctor about. During the initial appointment, your provider will likely ask you questions like:

• How has your cognitive function changed?
• When was the last time you felt normal?
• How long have you been noticing symptoms?
• What cognitive symptoms are you experiencing?
• Are there things that make your symptoms worse or better?

From this assessment, your doctor may order additional tests to study your symptoms, including:

Neuropsychological testing

Questionnaire-style assessments can help your doctor better understand your experience of brain fog. Examples include:

• Asking you to remember important events from your past
• Remembering medication timing
• Asking about details of your work and life
• Analyzing how you concentrate on tasks

Additional tests may assess how well you can switch between tasks.

One example involves naming the color of a word rather than the word itself. For example, the word “blue” written in red ink should be answered as “red”. This helps measure your focus and mental flexibility, which can be affected by lupus brain fog.

MRI imaging

Some people with lupus undergo MRI imaging to look for changes in the brain that could help explain neurological symptoms.

While imaging can provide useful context, it can’t diagnose brain fog on its own.

Coping with lupus brain fog

Brain fog can be difficult to manage as it can make it harder to concentrate, stay organized, and follow treatment plans designed to ease symptoms.

This being said, there are still things you can do to make living with brain fog easier, including:

• Writing down your plans: Keeping track of the things you need to do manually can help take the load off mentally. Using your phone or a pen and paper, make lists of things like what you need to do or where you need to go. This can make day-to-day life more manageable.

• Using visual cues: Keeping important items in consistent, visible places can help reduce the mental effort of remembering things.

• Focusing on one thing at a time: When possible, focusing on one task at a time can help reduce mental overload and make it easier to stay on track.

• Slowing down: During a flare-up, give yourself permission to work more slowly. This helps reduce your risk of burnout.

• Exercising regularly: Physical activity can help improve your mental function. Gentle movement, such as walking or yoga, can ease symptoms of brain fog. Opt for whatever exercise feels manageable for you.

• Assessing your sleep habits: Low-quality sleep can contribute to brain fog. Take a look at your sleep habits, including how long you sleep for, where you sleep, and your comfort level. Little adjustments, like setting a bedtime routine and sticking to it, can make it easier to get better quality sleep.

• Eating nutritious foods: Following a balanced lupus diet can help support your brain by providing essential nutrients and energy.

• Joining a support group: Many people with lupus brain fog struggle with feeling like they are alone. Finding a supportive community support group can help connect you to other people with similar experiences, making things less overwhelming and frustrating.

• Speaking to a cognitive therapist: A specialized cognitive therapist could help you manage symptoms. Bringing a detailed brain fog symptom journal to these appointments can help them better support your needs.

Keeping track of lupus brain fog

Living with lupus brain fog can be frustrating. It might feel like something you can’t fully explain, especially when symptoms come and go.

Like other lupus symptoms, diligently tracking your experience with brain fog is a great way to better understand your condition and potential triggers. You can log symptoms on the Human Health app alongside your sleep quality, stress levels, diet, and medications to help you better advocate for your needs.

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Frequently asked questions

What does lupus fatigue feel like?

Lupus fatigue is a common lupus symptom that causes you to feel severely exhausted. It can often come on suddenly, and it may not be improved by rest.

People with lupus experience fatigue differently. Some describe it as a feeling of heaviness. For others, it feels like recovering from the flu or losing most of their daily energy.

How does lupus affect the brain?

Lupus can affect the brain by causing inflammation and changes in how the immune system functions. This can lead to a range of neurological and cognitive symptoms, including brain fog, headaches, and changes in mood.

In some cases, more severe symptoms such as seizures can occur—but these are less common.

Does lupus cause mental health issues?

Yes, lupus can cause mental health conditions such as anxiety, depression, and mood swings. In rare cases, it can also cause psychosis, where a person hears and sees things that are not there.

Disclaimer: Human Health is a health tracking platform and does not provide medical advice, diagnosis, or treatment. The information in this guide is for educational purposes only and is not a substitute for professional medical care. Always consult your doctor or healthcare provider with questions about your health.

Sources:

1. Lupus and brain fog, The Lupus Foundation of America
2. Factors Influencing Subjective Mental Alterations: Unraveling The Lupus Brain Fog (2025)
3. The Effects of Systemic Lupus–Related Cognitive Impairments on Activities of Daily Living and Life Role Participation: A Qualitative Framework Study (2023)
4. Lupus brain fog: changes in memory and thinking, Hospital for Special Surgery
5. Brain fog, The Cleveland Clinic
6. Lupus support groups, The Lupus Foundation of America
7. Lupus and the nervous system, The Lupus Foundation of America