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8 Common Causes of Fatigue and Low Energy

Do you feel like you constantly have no energy? Are you feeling run down and exhausted? If so, you are not alone. Fatigue is a common problem that many people deal with on a daily basis. In this blog post, we will discuss eight common causes of fatigue and low energy. By understanding the root of your fatigue, you can work to address the issue and start feeling more energetic!

What is Fatigue

Fatigue is when your body feels tired, and you can’t do anything about it. It’s different from being sleepy, which is when you could fall asleep if given a chance. Fatigue can be physical, mental, or both. It can come on suddenly or gradually. And it can be short-lived or long-lasting.

Fatigue is characterized by a feeling of exhaustion and low energy not relieved by rest. It can be debilitating, making it difficult to function normally. If you’re experiencing fatigue, you may have difficulty concentrating, remembering, or making decisions. You may also feel irritable and have mood swings.

Fatigue can also make it hard for you to get through the day or even get out of bed. Moreover, fatigue is a common problem that can be difficult to deal with. If you’re struggling with fatigue, talk to your doctor to find out what might be causing it and how you can treat it.

What Causes Fatigue and Low Energy

Many different things can cause fatigue and low energy. Sometimes it’s simply due to not getting enough sleep or not eating healthy foods. Other times, it may be a sign of a more serious condition, such as anemia or fibromyalgia.

Here are some common causes of fatigue and low energy:

Sleep Deprivation

There are many causes of fatigue, but one of the most common is sleep deprivation. When we don’t get enough sleep, our bodies can’t function properly, and we can end up feeling exhausted. Sleep deprivation can be caused by a number of things, including stress, anxiety, depression, and even medical conditions. If you think you might be suffering from sleep deprivation, you must see a doctor to rule out any underlying medical conditions.

Once you know that sleep deprivation is the cause of your fatigue, there are a few things you can do to help yourself get more rest:

  1. Try to stick to a regular sleep schedule. Go to bed and wake up at the same time each day, even on weekends. This will help your body get into a regular sleep rhythm.
  2. Create a relaxing bedtime routine. This could include taking a warm bath, reading a book, or stretching. Doing something calming before bed can help you fall asleep more easily.
  3. Make sure your bedroom is dark and quiet.

Remove any electronic devices that might emit light or noise, and consider using a white noise machine to help you sleep.

Thyroid Problems

If you’re constantly feeling fatigued, it might be time to check in with your thyroid. An underactive thyroid, or hypothyroidism, can cause fatigue, among other symptoms like weight gain and depression. So if you’ve been feeling extra tired lately, it’s worth getting your thyroid checked out.

You can do a few things to help improve your thyroid function. First, cut out any processed foods and eat a clean, whole foods diet. Getting enough iodine is also important for thyroid function, so ensure you’re eating plenty of iodine-rich foods like seaweed or taking a supplement. Finally, managing stress is key for overall health and well-being, so make sure to find time for relaxation and self-care.

If you think your fatigue might be due to an underactive thyroid, talk to your doctor about getting tested. With the right treatment, you can start feeling like yourself again.

Sleep Apnea

If you’re always tired, it might be time to look closely at your sleep habits. One potential cause of fatigue is obstructive sleep apnea, a condition in which your airway becomes blocked while you sleep. This can cause you to snore loudly and wake up frequently, leading to fatigue during the day. If you think you may have sleep apnea, it’s important to see a doctor to get treatment. Treating sleep apnea can help improve your sleep quality and make you feel more rested during the day.

One of the most common methods of diagnosing sleep apnea is through a sleep study. This is where patients are observed overnight in a sleep lab. Doctors will look at how often you stop breathing and how much oxygen your blood gets while you sleep.

Sleep studies can help diagnose sleep apnea, but they’re not always necessary. In some cases, your doctor may be able to diagnose sleep apnea based on your symptoms and medical history. If you think you might have sleep apnea, talk to your doctor about getting a diagnosis.


If you’re feeling run down and tired all the time, it’s worth checking in with your doctor to see if you might have anemia. Anemia is a condition where there aren’t enough healthy red blood cells to carry oxygen throughout your body and can leave you feeling exhausted. A simple blood test can check your levels and see if you need treatment, so don’t hesitate to ask your doctor about it.

If you do have anemia, there are a few different ways to treat it. One option is to take iron supplements to help your body make more red blood cells. You might also need to change your diet to include iron-rich foods, like leafy green vegetables or lean meats. In some cases, you might need a blood transfusion to get your levels back up.


Fibromyalgia is a chronic condition that causes widespread pain and tenderness in the body. The cause of fibromyalgia is unknown, but it is thought to be related to changes in the central nervous system. Fibromyalgia can make it difficult to get a good night’s sleep, leading to fatigue during the day. People with fibromyalgia may also experience other symptoms, such as headaches, depression, anxiety, and irritable bowel syndrome. There is no cure for fibromyalgia, but there are treatments that can help manage the symptoms. If you think you may have fibromyalgia, talk to your doctor about the best treatment options.

There’s no definitive test for fibromyalgia, so diagnosis often relies on ruling out other conditions that could be causing your symptoms. If your doctor thinks you may have fibromyalgia, they will likely ask about your medical history and perform a physical exam. They may also order blood tests or imaging studies to rule out other conditions.

Treatment for fibromyalgia often includes a combination of medication, exercise, and lifestyle changes. Medications to treat fibromyalgia include pain relievers, antidepressants, and anti-seizure drugs. Exercise can help improve muscle pain and fatigue, while relaxation techniques may help reduce stress and anxiety. Making changes to your diet, such as avoiding caffeine and eating more healthy foods, can also help manage symptoms.

Nutrient Deficiency

Poor nutrition can lead to a host of health problems, one of which is fatigue. When you don’t have enough nutrients in your diet, your body doesn’t have the energy to function properly. This can leave you feeling tired and sluggish all day long.

There are a few key nutrients that are particularly important for energy levels. Iron is one of them. Iron helps carry oxygen to your cells, which is essential for energy production. If you’re not getting enough iron in your diet, you may start to feel tired and run down.

Another important nutrient for energy is B vitamins. B vitamins are involved in converting food into energy. If you’re not getting enough B vitamins, you may start to feel fatigued.

If you’re feeling tired all the time, it’s a good idea to check in with your diet. Make sure you’re getting enough of the key nutrients your body needs for energy production. If not, talk to your doctor about supplements or other ways to get the nutrients you need.

Caffeine Overload

Do you love coffee but find yourself feeling more tired than energized? You might be suffering from caffeine overload. Caffeine is a stimulant, which means it can help to increase energy levels and improve alertness. However, consuming too much caffeine can have the opposite effect and leave you feeling exhausted.

Caffeine overload can cause fatigue for a few different reasons. First, when you drink too much caffeine, your body becomes used to the high levels of caffeine and starts to build up a tolerance. This means that you need more and more caffeine to get the same effect, which can lead to consuming large amounts of caffeine and not getting enough sleep.

Another reason why too much caffeine can cause fatigue is because it can interfere with your body’s natural sleep cycle. Caffeine has a half-life of around five hours, meaning it takes five hours for your body to metabolize half of the caffeine you’ve consumed. So, if you drink coffee at noon, half of the caffeine will still be in your system when it’s time for bed.

If you’re struggling with fatigue, taking a step back and assessing your caffeine intake is important. If you find that you’re drinking more than three cups of coffee per day or more than 400 mg of caffeine, it’s time to cut back. Try switching to decaf coffee or tea or reducing the number of caffeinated beverages you drink each day. Your body will thank you!


Dehydration is one of the most common causes of fatigue. When dehydrated, your body doesn’t have enough water to perform its normal functions. This can lead to feeling tired, sluggish, and even dizzy.

The best way to avoid dehydration-related fatigue is to make sure you’re drinking plenty of fluids throughout the day. Water is always the best choice, but you can also get fluids from beverages like juice and milk. If you’re exercising or spending time in a hot environment, drink even more than usual.

If you think you might be dehydrated, start by drinking some water and see how you feel. If your fatigue doesn’t improve or you’re also experiencing other symptoms like headache or muscle cramps, it’s a good idea to see a doctor. Dehydration can be serious, so it’s always best to err on the side of caution.

Bottom Line

So there you have it! These are the most common causes of fatigue and low energy. If you’re feeling fatigued or low energy, it’s important to take a step back and look at your lifestyle. Are you getting enough sleep? Eating healthy foods? Managing your stress levels? If not, making some changes in these areas can make a big difference.

Talk to our team of experts if you need help making these changes. We can work with you to create a personalized plan that will help you feel your best. Book your appointment here.

Hi! I’m Dr. E, The NP with a PHD. Several years ago, my wife was diagnosed with an autoimmune disease and the only options given to us were heavy duty medications.

We KNEW there had to be a better way. After a long search, we discovered functional medicine.

With functional medicine we found alternative ways we were able to manage her disease and get her back to feeling like her old self.

We discovered that this way of life not only helps people with various issues, including autoimmune, chronic issues and “I-don’t-feel-good-itis.”

Functional medicine drastically changed our lives and using it I developed The KNEW Method to help others who are suffering or not feeling optimal.

Let’s work together to get you to feeling like your old self again.

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