Brain Fog During Pregnancy: Know Why You Can’t Remember Things

Brain fog during pregnancy is a common experience where many women notice changes in memory, focus, and mental clarity.

Most people think pregnancy changes the uterus, hormones, breasts, and belly.

But one of the most remarkable transformations happens somewhere you cannot see.

Your brain.

For decades, pregnancy research focused primarily on the body.

Scientists studied fetal growth, hormonal changes, and maternal health while paying relatively little attention to the brain itself.

Today, that is changing.

Modern brain imaging studies have revealed that pregnancy is associated with measurable changes in brain structure, function, and connectivity.

These changes are so significant that researchers can often identify whether a woman has been pregnant simply by examining certain brain scans.

As a women’s health physiotherapist, I often hear women describe feeling “different” mentally during pregnancy.

They may feel:

• More forgetful
• More emotional
• More sensitive
• More distracted
• More focused on baby-related information
• More mentally tired

For years, these experiences were often dismissed as “pregnancy brain.”

We now know the story is much more fascinating.

Pregnancy does not simply affect your body.

It helps reshape your brain for motherhood.

Your Brain Changes More Than You Think

Pregnancy is one of the most dramatic biological events the human body can experience.

Within a few months, nearly every organ system adapts.

The brain is no exception.

Researchers have discovered that pregnancy influences regions involved in:

• Memory
• Emotional processing
• Social awareness
• Decision-making
• Maternal behavior

These changes begin during pregnancy itself and are thought to help prepare women for caring for a newborn. (Hoekzema et al. 2017)

This means that pregnancy-related brain changes are not simply imagined.

They are measurable.

Is Pregnancy Brain Real?

Many pregnant women describe moments such as:

• Walking into a room and forgetting why
• Misplacing keys
• Losing track of conversations
• Forgetting appointments
• Struggling to multitask

These experiences are commonly called “pregnancy brain.”

What Research Says

Research findings are mixed.

Some studies suggest small changes in certain aspects of memory and cognitive performance.

Others find minimal objective differences.

However, what researchers consistently find is that many women genuinely experience changes in attention, focus, and mental workload during pregnancy. (Ankit et al. 2022)

Why It Feels So Real

Even when formal testing shows only modest differences, daily life during pregnancy places enormous demands on the brain.

Women are often managing:

• Physical symptoms
• Medical appointments
• Work responsibilities
• Birth preparation
• Family planning
• Sleep disruption

The result can feel very much like mental fog.

The Hormone Surge Inside The Brain

One of the biggest drivers of pregnancy-related brain changes is hormones.

Estrogen

Estrogen levels rise dramatically during pregnancy.

This hormone influences:

• Memory pathways
• Emotional regulation
• Neural communication

Progesterone

Progesterone helps maintain pregnancy but also affects the nervous system.

Many women notice:

• Increased fatigue
• Changes in alertness
• Different sleep patterns

Oxytocin

Often called the “bonding hormone,” oxytocin plays a major role in preparing mothers for nurturing and caregiving.

The Combined Effect

Rather than affecting one small area, these hormones influence multiple brain networks simultaneously.

This helps explain why pregnancy can affect emotions, sleep, memory, and behavior all at once.

How Pregnancy Can Affect Memory And Focus

Forgetfulness is one of the most talked-about pregnancy experiences.

But memory changes are only part of the story.

Attention Shifts

Many women become highly focused on baby-related information.

For example, they may quickly notice:

• Baby products
• Pregnancy advice
• Infant sounds
• Safety concerns

At the same time, less relevant information may receive less attention.

The Brain Prioritizes Differently

Some researchers believe the brain becomes more selective during pregnancy.

Instead of processing everything equally, it may allocate more resources toward information related to motherhood.

This Is Not Necessarily A Problem

In many cases, the brain may be adapting rather than declining.

The priorities are simply changing.

The Surprising Brain Scan Discoveries

One of the most exciting discoveries in maternal health research came from advanced brain imaging studies.

Structural Changes Were Observed

Researchers found reductions in gray matter volume in specific brain regions during pregnancy. (NIH)

At first glance, this sounds concerning.

It is not.

Why Less Can Mean More

Scientists believe these changes may represent a process called neural refinement.

The brain may be becoming more specialized and efficient in areas related to maternal behavior.

Similar Processes Occur Elsewhere

The brain undergoes similar refinement during adolescence.

In both cases, the goal appears to be improved specialization rather than loss of function.

Why Emotions Feel Stronger During Pregnancy

Many women report feeling more emotional during pregnancy.

They may cry more easily.

Feel more protective.

Become more empathetic.

Or react more strongly to situations that previously seemed minor.

Hormones Play A Role

Hormonal fluctuations influence emotional processing centers within the brain.

Increased Social Awareness

Researchers believe pregnancy may enhance sensitivity to social and emotional cues.

This adaptation may help mothers respond more effectively to their babies after birth.

Emotional Changes Are Often Normal

Experiencing stronger emotions does not mean something is wrong.

In many cases, it reflects the brain’s ongoing adaptation to pregnancy.

The Maternal Brain: Preparing For Motherhood

One of the most fascinating concepts in modern maternal neuroscience is the idea of the maternal brain.

The Brain Is Preparing Ahead Of Time

Long before birth, the brain begins adapting for caregiving.

Researchers believe these changes help mothers:

• Recognize infant needs
• Interpret facial expressions
• Respond to cries
• Build emotional bonds

Why This Matters

A newborn depends entirely on caregivers.

The maternal brain appears to be preparing for that responsibility before the baby even arrives.

Evolutionary Benefits

From an evolutionary perspective, these adaptations may improve infant survival and maternal responsiveness.

Sleep, Fatigue And Mental Fog

As a physiotherapist, I often find that sleep has a greater impact on mental clarity than many women realize.

Pregnancy Disrupts Sleep

Sleep challenges are extremely common during pregnancy. (Cleveland Clinic)

Women frequently experience:

• Frequent urination
• Heartburn
• Physical discomfort
• Positioning difficulties
• Anxiety

Sleep And Memory Are Closely Linked

The brain relies on sleep for:

• Memory consolidation
• Learning
• Attention
• Decision-making

When sleep quality declines, concentration often declines too.

Calculate your ideal sleep timings here: “Sleep calculator“

Sometimes It Is Not Pregnancy Brain

Sometimes it is simply exhaustion.

Stress And Cognitive Overload During Pregnancy

Pregnancy involves a tremendous amount of planning and decision-making.

The Mental Checklist Never Ends

Many women are thinking about:

• Prenatal appointments
• Birth plans
• Baby supplies
• Childcare
• Work arrangements
• Financial planning

Cognitive Resources Are Limited

The brain can only process so much information at once.

When mental demands increase, forgetfulness may become more noticeable.

This Is A Human Response

It reflects workload, not weakness.

How Exercise Supports Brain Health During Pregnancy

Pregnancy Exercise benefits far more than muscles and joints.

Movement Supports The Brain

Research suggests physical activity may help support (Shen et al. 2025):

• Blood flow
• Mood
• Stress regulation
• Sleep quality
• Cognitive performance

A Physiotherapist’s Observation

Women who remain appropriately active during pregnancy often report:

• Better energy
• Improved mood
• Less mental fatigue
• Better sleep quality

While exercise is not a cure for forgetfulness, it can support overall wellbeing.

What A Physiotherapist Notices About Brain And Body Connections

One of the biggest mistakes people make is separating physical and mental health.

The two are deeply connected.

Physical Fatigue Influences Mental Performance

When the body is tired, the brain often feels tired too.

Pain Consumes Attention

• Back pain
• pelvic pain
• wrist pain

and other pregnancy discomforts require mental resources.

Stress Changes Thinking

When stress increases, concentration often decreases.

This is why improving physical wellbeing can sometimes improve mental clarity as well.

Will Your Brain Go Back To Normal After Birth?

This is one of the most common questions women ask.

The Short Answer

Many pregnancy-related symptoms improve after birth.

The Longer Answer

Research suggests some maternal brain adaptations may persist for years. (Orchard et al. 2023)

Importantly, these changes are not considered harmful.

Many scientists believe they represent beneficial adaptations associated with parenting.

Motherhood Changes The Brain

In some ways, the brain does not return to exactly what it was before.

Instead, it evolves.

When Memory Changes Need Medical Attention

Mild forgetfulness is common during pregnancy.

However, significant cognitive changes deserve medical evaluation.

Speak with your healthcare provider if you experience:

• Severe confusion
• Sudden memory loss
• Major personality changes
• Persistent inability to function normally
• Neurological symptoms

These symptoms require professional assessment.

Final Thoughts

Pregnancy is not simply changing your body.

It is changing your brain too.

For years, pregnancy-related forgetfulness was often treated as a joke or dismissed as an exaggeration. Modern science tells a very different story.

The brain undergoes real biological adaptations throughout pregnancy.

Hormones reshape neural activity.

Emotional processing evolves.

Attention shifts.

Social awareness increases.

Specialized maternal networks begin developing long before your baby arrives.

As a physiotherapist, I encourage women to view these changes not as signs of decline but as signs of adaptation.

Your brain is preparing for one of the most important roles it will ever perform.

The occasional forgotten appointment or misplaced phone charger may be frustrating.

But behind those moments is a remarkable process that helps prepare you for motherhood.

And that may be one of the most extraordinary transformations of pregnancy.

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Medical Disclaimer!

This article has been reviewed and written under the guidance of our Head Physiotherapist, Dr. Kruti Raj (PT, MUHS,CPT,CMPT). The information shared is intended for educational purposes only and should not be considered a substitute for personalized medical advice, diagnosis, or treatment.

Please consult us or any other qualified healthcare professional before beginning any exercise program, especially if you are experiencing pain, recovering from injury, or managing a medical condition.