Always Tired? Thyroid Fatigue May Be to Blame—Here’s How to Spot It and Feel Better Fast 

Constantly feel tired, even after a full night’s sleep? Fatigue is one of the most common complaints among women, especially in midlife. But while many of us chalk it up to stress or poor sleep, there may be an underlying hormonal cause. Persistent tiredness is often linked to thyroid dysfunction, known as thyroid fatigue. Whether it stems from an underactive or overactive thyroid, the exhaustion can be real and debilitating. We spoke with healthcare professionals to better understand thyroid fatigue and how to manage it for more energy and a better quality of life.

What is thyroid fatigue?

“Thyroid fatigue refers to the persistent exhaustion and low energy that many patients experience when their levels of thyroid hormones are imbalanced,” explains Stacy Heningsman, DO, OBGYN and physician at Paloma Health. It can occur with both types of thyroid disorders,  including hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid). 

The thyroid gland produces hormones that help regulate metabolism, energy levels and other bodily functions. When thyroid hormone levels are too low or too high, it can throw your entire system out of balance. As a result, energy levels are often the first thing to suffer. 

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“In hypothyroidism, fatigue often feels like a sluggish, unrelenting tiredness that doesn’t improve with rest,” continues Dr. Heningsman. “It occurs because the body’s metabolism slows down, impacting everything from energy production to cognitive function.” In contrast, hyperthyroidism fatigue can feel more like burnout. “Patients may be restless or anxious, but still feel physically drained because their body is in overdrive,” says Dr. Heningsman.

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Thyroid problems are more common than you may think 

According to the American Thyroid Association, an estimated 20 million Americans have some form of thyroid disease, and up to 60 percent are unaware of their condition. Among them, fatigue is one of the most common symptoms that sends people to the doctor. Women, particularly those over age 50 or going through menopause, are significantly more likely to experience thyroid issues and the fatigue that comes with them.

“In both [hyperthyroidism and hypothyroidism], fatigue is one of the most common and debilitating symptoms of thyroid dysfunction, and it often persists even when other symptoms have improved,” adds Dr. Heningsman.

Key symptoms of thyroid-related exhaustion

While fatigue is itself a symptom, many other signs can accompany it if your thyroid is imbalanced. 

“With hypothyroidism, some patients experience the initial ‘toxic’ phase,” explains Kavya Mekala, MBBS, endocrinologist at Yale Medicine. As metabolism slows, which can take months, so do bodily functions. “This manifests in low energy causing excessive sleepiness, weight gain, difficulty with memory and concentration, constipation and scaly or dry skin,” says Dr. Mekala. 

In contrast, Dr. Mekala says those with hyperthyroidism expend their energy too fast. “This can present with a whole host of symptoms such as excessive sweating, nervousness, irritability, weight loss, racing heart, diarrhea or increased bowel frequency and sleeplessness,” she says. “I like to use the analogy of pushing on the gas pedal when the fuel tank is empty. The hyperthyroid individual feels exhausted.”

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However, Dr. Mekala emphasizes that fatigue can be caused by a wide range of other medical and non-medical conditions. “The thyroid gland is the ‘master of none,’” she says. “In other words, experiencing fatigue or low energy does not automatically mean that thyroid malfunction is responsible for the symptom.” This underscores the importance of an accurate diagnosis by a trained medical professional. This process typically involves a blood test to check your levels of thyroid-stimulating hormone (TSH), among other markers. 

Expert tips to manage thyroid fatigue naturally

The good news? If your fatigue is linked to thyroid issues, managing the condition often helps improve energy levels significantly. “While treating the root thyroid imbalance with medication is essential, there are several lifestyle strategies that can support energy levels in the meantime,” says Dr. Heningsman. These include the following: 

• Reduce stress. “Managing stress through practices like mindfulness, journaling or deep breathing can support adrenal function and reduce the fatigue often tied to thyroid hormone fluctuations,” says Dr. Heningsman. 
• Prioritize sleep. “Good sleep hygiene—going to bed at the same time each night, reducing screen time before bed and keeping a dark, cool environment—can make a big difference,” says Dr. Heningsman. 
• Avoid smoking. “Tobacco products are highly inflammatory and the most common trigger for autoimmune thyroid inflammation, especially Graves’ disease,” says Dr. Mekala. “On the contrary, smoking cessation can have a positive impact on the disease course and accelerate the process of healing and entering remission.”
• Eat a healthy diet. “This is essential for optimal thyroid function. Too much or too little of certain micronutrients can wreak havoc on thyroid hormonal balance,” says Dr. Mekala. Choose foods with nutrients including iodine, selenium, zinc and iron. However, she advises caution with thyroid supplements, as they may cause more harm than good.
• Get gentle movement. “Gentle movement like walking, yoga or stretching can help combat fatigue without overexerting the body,” says Dr. Heningsman. 

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The bottom line on thyroid fatigue

Thyroid fatigue is real and often misunderstood. The key to finding relief is recognizing the signs early, getting the right tests and working with your provider on a personalized care plan. “I explain to my patients that while not always possible, the best outcome is if we can restore normal thyroid function,” says Dr. Mekala. So, if your tiredness feels unshakable, it might be time to check on your thyroid function.