Brain Fog, Joint Pain and Weight Gain in Perimenopause: What’s Really Going On?

You wake up and your knees suddenly feel creaky. You walk into a room and forget why you’re there. The workouts that used to work for your body don’t seem to have the same effect anymore.

Brain fog, joint pain and weight changes can feel like completely separate problems. But during perimenopause, many women notice them appearing around the same time.

In this Perry Short, created in collaboration with Bonafide Health, Perry Community Manager Kristin Cohen sits down with board-certified OB-GYN and Bonafide Health Chief Medical Officer Dr. Alyssa Dweck to answer the questions women in our community are actually asking about these often-overlooked symptoms.

Why Can So Many Symptoms Appear at Once?

Perimenopause isn’t only about hot flashes and changing periods.

During the transition, estrogen and progesterone can fluctuate significantly before eventually declining in menopause. As Dr. Dweck explains, hormone receptors exist throughout the body, which helps explain why hormonal changes can be felt far beyond the reproductive system.

That can include changes in how women experience their joints, muscles, cognition, sleep, metabolism and more.

But there is an important caveat: not every new symptom in midlife should automatically be blamed on hormones.

Joint Pain in Perimenopause: Is It Really Hormonal?

Joint and muscle discomfort during perimenopause can be multifactorial.

Hormonal changes may contribute, but so can age, overuse, arthritis and previous sports injuries. Dr. Dweck also stresses that persistent or worsening pain deserves medical attention because autoimmune conditions, Lyme disease, osteoarthritis and other conditions can cause similar symptoms.

In other words: hormones may be part of the picture, but they shouldn’t become an explanation for everything.

Dr. Dweck also discusses frozen shoulder, a painful condition involving the shoulder capsule that is more common around ages 40 to 50 and can occur during the perimenopausal years.

Why Does Exercise Suddenly Feel Different?

Another question we hear frequently in the Perry community: Why does recovery feel harder than it used to?

For some women, perimenopause may require a shift in how they approach exercise.

Dr. Dweck emphasizes continuing to exercise while recognizing that routines may need to evolve with age and menopause. Rather than constantly pushing toward the heaviest weights or most punishing workouts, avoiding injury and finding exercise that leaves you feeling strong rather than depleted becomes increasingly important.

What Does Perimenopause Brain Fog Actually Feel Like?

Walking into a room and forgetting why you’re there.

Struggling to find a word you’ve used a thousand times.

Losing your train of thought in the middle of a meeting.

Having a harder time multitasking or making decisions.

Dr. Dweck explains that “brain fog” isn’t itself a medical diagnosis. Instead, it describes a collection of cognitive symptoms that many women report during perimenopause.

For many women, these changes can be frightening. They may wonder whether what they’re experiencing could be an early sign of dementia, Alzheimer’s disease or another serious neurological problem.

Dr. Dweck offers an important point of reassurance: when these symptoms are related to perimenopause rather than another medical condition, they are typically transient and can improve.

Good-quality sleep is one of the things she emphasizes for supporting cognitive health. She also recommends keeping the brain engaged through activities that require cognitive effort, from reading and puzzles to games, music and learning another language.

More significant or concerning memory changes, however, should be evaluated by a healthcare professional rather than simply attributed to perimenopause.

Why Does Weight Change During Perimenopause?

Weight gain is one of the most discussed and often most frustrating parts of the midlife transition.

But the story is more complicated than “your hormones made you gain weight.”

Dr. Dweck explains that age, loss of muscle, metabolic changes, diet and exercise can all contribute. Hormonal changes may also affect where weight is distributed.

One major focus? Strength training.

Building and maintaining muscle can support strength and metabolic health during perimenopause and menopause.

Dr. Dweck also recommends looking beyond the scale. Depending on the individual, healthcare providers may want to assess factors including lipids, blood glucose, insulin sensitivity and potential metabolic syndrome.

And What About Inflammation?

“Inflammation” has become one of the most frequently used words in women’s health, but what does it mean in the context of perimenopause?

Dr. Dweck points to estrogen’s anti-inflammatory role. As estrogen declines, inflammation may increase. At the same time, diet, physical inactivity and stress can also promote inflammation, making this another area where hormones and lifestyle can intersect.

Can Hormone Therapy Help?

Hormone therapy isn’t prescribed specifically as a weight-loss treatment. But Dr. Dweck explains that it may have indirect effects for an appropriate patient.

For example, if hormone therapy reduces hot flashes and night sweats, a woman may sleep better. Better sleep may then improve brain fog and influence behaviors that affect weight and overall wellbeing.

This is an important way to think about perimenopause care: symptoms don’t always exist in isolation. Improving one problem may have downstream effects on several others.

The Biggest Takeaway: Be Proactive

If there is one message Dr. Dweck wants women to take from the conversation, it is to be proactive.

Lifestyle habits, understanding what may be coming and paying attention when symptoms begin can all help women navigate this transition with greater awareness.

And there is an equally important message for healthcare professionals.

Keep an open mind.

Not every symptom experienced during midlife is caused by perimenopause. But perimenopause can affect far more of the body than many women, and many clinicians, have historically been taught to recognize.

Watch the full Perry Short above for the complete conversation with Dr. Alyssa Dweck.

Medical Disclaimer

This content is for educational and informational purposes only and is not intended as medical advice, diagnosis or treatment. Perimenopause symptoms and treatment needs vary from person to person. Always consult a qualified healthcare professional about symptoms that are new, persistent, worsening or concerning, and before starting, stopping or changing any medication, supplement or treatment.