You wake up tired—even after spending seven or eight hours in bed.

You get through the morning, but by afternoon, your energy starts to disappear.

Maybe you reach for another cup of coffee or something sweet just to keep going.

And when you finally have time to exercise, make dinner, or do something for yourself, you're exhausted.

Many women I speak with after 45 tell me some version of the same thing:

“I just don't have the energy I used to have.”

Sometimes they've already had bloodwork done and were told that everything looks “normal.”

Yet they still don't feel like themselves.

Fatigue is common in midlife, but that doesn't mean you should automatically accept feeling exhausted as a normal part of getting older.

There are many possible reasons for fatigue, and often there isn't just one.

Sleep, blood sugar, hormonal changes, thyroid function, nutritional deficiencies, stress, medications, medical conditions, and lifestyle can all influence how much energy you have.

The important question isn't simply:

“How can I get more energy?”

It's also:

“Why am I so tired in the first place?”

1. You May Be Sleeping—but Are You Actually Resting?

One of the first things I want to know when someone tells me she's exhausted is how she's sleeping.

And I don't mean only:

“How many hours are you in bed?”

You can spend seven or eight hours in bed and still wake up feeling exhausted if the quality of your sleep is poor.

Maybe you have trouble falling asleep.

Maybe you fall asleep easily but wake up at 2:00 or 3:00 in the morning.

Maybe hot flashes or night sweats wake you.

Or perhaps you sleep through the night but still don't feel refreshed in the morning.

Stress, hormonal changes, alcohol, caffeine, medications, sleep apnea, restless legs, pain, and many other factors can interfere with restorative sleep.

Sleep is when your body performs many important restorative functions. When your sleep is repeatedly disrupted, the effects can show up throughout the following day as fatigue, difficulty concentrating, irritability, cravings, and lower motivation to exercise.

“Why Is Belly Fat So Hard to Lose After 45? How Stress and Sleep May Affect Your Weight.”

2. Your Blood Sugar May Be Affecting Your Energy

Have you ever eaten lunch and then felt as though you could take a nap an hour or two later?

Or perhaps you feel fine in the morning but experience a significant energy crash in the afternoon.

Blood sugar regulation may be one piece of the picture.

When you eat, your body converts much of the carbohydrate in your food into glucose, which provides energy for your cells.

Your body releases insulin to help move glucose from your bloodstream into your cells.

Meals that contain a large amount of refined carbohydrates or sugar—especially without enough protein, fiber, or healthy fat—can cause blood sugar to rise more quickly.

For some people, the changes that follow can leave them feeling tired, hungry, irritable, or craving something sweet.

“Why Am I Gaining Belly Fat After 45? A Physician Explains What May Be Changing,”

This is one reason I encourage women to think about how a meal makes them feel afterward, not simply how many calories it contains.

A meal that includes protein, fiber-rich carbohydrates, vegetables, and healthy fats can often provide more sustained energy than a meal built primarily around refined carbohydrates.

“Why Am I Craving Sugar After Dinner? Causes After 45.”

3. Hormonal Changes Can Affect More Than Your Period

Perimenopause and menopause can bring significant hormonal changes.

Estrogen and progesterone fluctuate and eventually decline, and these changes can affect much more than menstrual cycles.

They can influence sleep, mood, body temperature, concentration, body composition, and how you feel overall.

For example, if hot flashes or night sweats repeatedly wake you during the night, you may feel exhausted the next day.

Hormonal changes can also occur at the same time as increased stress, changes in insulin sensitivity, declining muscle mass, or thyroid problems.

That's why I don't believe every symptom after 45 should automatically be blamed on menopause.

Hormones may be part of the picture without being the entire picture.

4. Your Thyroid May Be Worth Evaluating

Your thyroid produces hormones that influence metabolism and many functions throughout your body.

When thyroid hormone levels are too low, fatigue can be one of the symptoms.

Other possible symptoms may include:

• Feeling unusually cold

• Constipation

• Dry skin

• Hair changes

• Difficulty concentrating

• Muscle weakness or aches

• Changes in weight

• Feeling sluggish or slowed down

However, fatigue by itself does not mean that you have a thyroid disorder.

There are many possible reasons someone may feel tired.

That's why symptoms need to be considered along with your medical history, examination when appropriate, medications, and laboratory testing rather than assuming that one symptom points to one diagnosis.

5. Nutritional Deficiencies and Other Medical Issues Can Cause Fatigue

Sometimes fatigue has a medical or nutritional cause that shouldn't be overlooked.

For example, iron deficiency and anemia can cause significant tiredness, weakness, shortness of breath, or reduced exercise tolerance.

Vitamin B12 deficiency can also contribute to fatigue and may cause neurological symptoms such as numbness, tingling, or difficulty with balance in some people.

Other nutritional deficiencies may also be relevant depending on your diet, health history, medications, and individual circumstances.

But this is also why I don't recommend simply taking a collection of supplements because you're tired.

You want to understand what your body actually needs.

Persistent fatigue can also be associated with infections, sleep disorders, autoimmune conditions, heart or lung problems, depression, medication effects, and many other medical conditions.

If your fatigue is persistent, worsening, severe, or unexplained, it deserves appropriate medical evaluation.

6. Chronic Stress Can Be Physically Exhausting

Sometimes fatigue isn't simply about how much you're doing.

It's about how long your body has been operating under stress.

Many women in midlife are balancing careers, relationships, children, aging parents, financial responsibilities, and the needs of everyone around them.

Even when you're sitting still, your mind may never really stop.

Chronic stress can interfere with sleep, affect appetite and blood sugar regulation, contribute to muscle tension, and leave you feeling mentally and physically drained.

You may wake up tired, push yourself through the day, and then find yourself too exhausted to do the very things that might help you feel better.

Over time, that can become a cycle.

This is another reason I believe rest and recovery are part of health—not rewards you have to earn after everything else is finished.

What Can You Do If You're Tired All the Time?

If you've been struggling with fatigue, you don't necessarily need to overhaul your entire life tomorrow.

Start by looking for patterns.

Pay attention to your sleep. Are you sleeping through the night? Do you wake feeling refreshed? Do you snore loudly or wake gasping? Are hot flashes, pain, stress, or frequent trips to the bathroom interrupting your sleep?

Build meals around protein and fiber. Balanced meals can help provide steadier energy and support healthier blood sugar regulation. For a deeper discussion of protein, see “How Much Protein Do Women Over 45 Need? A Physician Explains.”

Stay hydrated. Even mild dehydration can leave you feeling tired or less alert.

Move your body regularly. When you're exhausted, exercise may be the last thing you feel like doing. But appropriate regular activity can support energy, sleep, metabolic health, strength, and mood.

Don't overlook strength training. Maintaining muscle becomes increasingly important as we get older and can support both metabolic health and your ability to stay active.

Look at your stress load. Ask yourself not only “What am I doing?” but also “What am I carrying?”

And if your fatigue continues despite making healthy changes, don't simply keep pushing through it.

It may be time to look deeper.

“My Labs Are Normal, So Why Am I Still Tired?”

This is something I hear from women frequently.

They've had bloodwork.

They were told everything looked fine.

But they know they don't feel the way they used to.

Laboratory testing can provide valuable information, but numbers on a page are only one part of understanding someone's health.

Your symptoms matter.

Your sleep matters.

Your nutrition matters.

Your stress matters.

Your medical history, medications, activity, hormonal changes, and what has changed over time all matter.

A laboratory result should be interpreted in the context of the person sitting in front of you—not by itself.

Fatigue Is a Symptom, Not an Explanation

Feeling exhausted all the time isn't a diagnosis.

It's information.

Sometimes the explanation may be relatively straightforward, such as inadequate sleep or an iron deficiency.

Other times, several factors may be contributing at once.

The goal isn't to cover up fatigue with more caffeine or simply force yourself to keep going.

The goal is to understand why you're tired and address the factors that can actually be changed.

You don't have to automatically accept feeling exhausted as part of getting older.

Your fatigue may be an important clue that it's time to look more closely at what your body needs.

About Dr. Roopa Chari, MD

Dr. Roopa Chari, MD is an Internal Medicine physician with more than 25 years of experience practicing Functional and Integrative Medicine.

She helps women over 45 understand the underlying factors that may be contributing to weight gain, stubborn belly fat, fatigue, brain fog, poor sleep, hormonal and metabolic changes, digestive concerns, and other midlife health challenges.

Dr. Chari has been recognized with the Women’s Choice Award for Best Doctors for four consecutive years (2023–2026), reflecting her commitment to providing compassionate, personalized care.

At Chari Center of Health, Dr. Chari takes the time to listen, understand what you've been experiencing, and look at the different factors that may be affecting how you feel. Her goal is to help you understand what may be going on and create a personalized plan for your health.

Dr. Chari serves patients virtually in California and Florida.

Would you like to talk with Dr. Chari about what you've been experiencing?

Schedule a Complimentary 15-Minute Consultation to ask questions, share your concerns, and see whether Dr. Chari's approach may be right for you.

The information provided in this article is for educational purposes only and is not intended as medical advice or as a substitute for individualized medical care. Please consult with your physician or qualified healthcare professional regarding your individual health needs.