Reasons You're Tired All the Time That Have Nothing to Do With Sleep

sleepy all the time
Cole Saladino & Oren Aks/Thrillist

If there's one thing people love to brag about, it's how busy they are. If you have a full work schedule, hobbies, side hustles, maintaining a social life, and getting lost in a Netflix blackhole to keep track of, it's easy to believe that the reason you're tired all the time is because there's no room for sleep in your schedule. But chugging coffee like water and struggling to stay awake isn't cool, or even normal -- it could be the sign of a bigger problem.

If you get less than the recommended seven or eight hours of sleep a night, then you can expect to drag your feet a little bit the next day. But if you log plenty of Zzzs and still feel exhausted, then it could be a symptom of a chronic condition. Here are some of the biggest culprits that are making you sleepy.


Anemia occurs when you don't have enough red blood cells, which are important because they carry oxygen from your lungs to your tissues and cells. "Anemia causes fatigue because our cells are not receiving sufficient oxygen," Dr. John Swartzberg, chair of Berkeley Wellness' editorial board, says. 

Iron deficiency anemia is the most common type of anemia, but it can also be caused by a vitamin deficiency, internal bleeding, rheumatoid arthritis, or bone marrow disease. One major symptom of anemia is fatigue, but other symptoms include weakness, shortness of breath, dizziness, and cold hands and feet. To see if you're anemic, your doctor will run a complete blood count (CBC) test, and the treatment could be as simple as taking iron supplements.  

Thyroid problems

Your thyroid is in charge of releasing thyroid hormones (duh), and controlling your metabolism. If your thyroid gland is under-producing, that could lead to weight gain and a total lack of energy, among other symptoms. "Hypothyroidism, or low thyroid function, is a common and under-diagnosed cause of fatigue," says Dr. Jennifer Haythe, cardiologist and assistant professor of medicine at Columbia University Medical Center. "Constipation, dry skin, weight gain, thinning hair, and depression are just some of the other side effects of an underactive thyroid."

If you're experiencing these symptoms, check with your doctor, who will perform a simple blood test to be sure. Treatment usually includes medication.


Diabetics don't process glucose properly, which is a major problem since glucose is the body's main source of fuel. "As a result, circulating blood sugar levels are high, resulting in excessive urination, dehydration, blurry vision, and thirst. This leads to fatigue and exhaustion," Dr. Haythe says. Diabetes affects more than 29 million Americans -- 8 million of whom go undiagnosed.

Type 2 diabetes is usually caused by a mix of genetics and lifestyle, and although the stereotype of a diabetic is an obese person guzzling soda all day, skinny people can get it, too. If you experience any of the symptoms listed above, have your doctor run blood tests to confirm. 


Millions of Americans have depression, and one of its many effects can be feeling tired all the time. "Depression is a common cause of fatigue and low energy," Dr. Haythe says. "Depression can take on many forms. For some, excessive sleep, fatigue, and an inability to get out of bed is common."

Depression is more than just feeling sad; if you feel like you have no energy to get out of bed in the morning and face your day, and find yourself sleeping for hours on end, Dr. Haythe adds, make sure you seek professional help from your doctor or a psychiatrist.

Chronic Fatigue Syndrome

Chronic Fatigue Syndrome is exactly what it sounds like -- people who are always exhausted, to the point where they can't carry on with their everyday lives. Although doctors recognize this is a problematic condition, it's still mysterious, and there are no tests available to confirm its existence. 

"A variety of abnormalities have been found in people with CFS, but none sufficiently consistent to help us understand the cause," Dr. Swartzberg says. "Without knowing the cause(s) or what the precise abnormalities are, we don’t know why people with this syndrome have such profound fatigue." Although it goes by other names -- myalgic encephalomyelitis (ME) and systemic exertion intolerance disease (SEID) -- they're all just as baffling and can't be medically explained. But that shouldn't stop you from trying to seek treatment; talk to your doctor to see if your symptoms fit the CFS criteria, and to work out an effective treatment plan. 

Usually having a dip in energy or feeling sleepy one day isn't a huge deal; you could have a cold coming on, or maybe you drank too many beers the night before. But if it's a persistent problem, or something that interferes with your daily life and responsibilities, make sure you seek professional help. 

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Christina Stiehl is a Health and Fitness Staff Writer for Thrillist who is proud of her coffee-chugging skills. Follow her on Twitter: @ChristinaStiehl.