Fatigue and low energy.

What fatigue actually means.

Fatigue is a lasting sense of low energy or exhaustion that does not lift with a good night of rest. It is different from ordinary tiredness after a long day or a short night of sleep. Ordinary tiredness clears once you catch up. Fatigue tends to sit there for weeks, and it can affect your body, your concentration, or both at once.

You may have heard the term adrenal fatigue used online or in wellness marketing. It is not a recognized medical diagnosis. The adrenal glands can fail in ways a doctor can test for, but the everyday exhaustion people describe as adrenal fatigue almost always traces back to one of the more common and better understood causes below.

What commonly causes it.

Fatigue has a wide range of accepted medical causes. Sleep disorders such as insomnia or sleep apnea are among the most common. So are low iron and anemia, an underactive thyroid, uncontrolled blood sugar, depression, and anxiety. Chronic infections and side effects from certain medications can cause it too. Heart and lung conditions are on the list as well, especially when fatigue comes with shortness of breath. Long stretches of stress, poor nutrition, dehydration, and a sedentary routine all play a part, and they often stack on top of one of the causes above rather than acting alone.

What the signs typically look like.

People with ongoing fatigue often describe waking up tired even after a full night in bed, needing caffeine to get moving and again to keep going, and hitting a hard wall by mid-afternoon. Some notice it as physical heaviness in the arms and legs. Others notice it more as mental fog, trouble concentrating, or feeling slow to respond. Duration is a useful marker. Fatigue lasting more than two or three weeks, or fatigue that keeps getting worse instead of better, is worth bringing to a doctor rather than waiting out.

What a doctor typically looks at.

A physician working up fatigue usually starts with your history, including your sleep, mood, appetite, weight, medications, and any recent illness. From there, blood work is common and often includes a complete blood count, thyroid tests, iron levels, and a blood sugar screen. Depending on what turns up, a doctor may order more specific testing or refer you for a sleep study. The point of that workup is to find the actual cause, because fatigue by itself does not point to one answer.

What you can reasonably do next.

Start by paying attention to the pattern. Note when the fatigue is worst, how your sleep has been, and whether anything else changed around the time it started, like a new medication or a stressful stretch at work or home. That kind of detail is genuinely useful to a physician. Your primary care doctor is the right place to begin, since fatigue this persistent deserves an exam and, in most cases, blood work.

What Boss Chiropractic actually does here.

Boss Chiropractic is a chiropractic office. We examine and treat mechanical problems in the spine and joints, the kind that come from a disc, a joint, or a nerve being irritated. If pain in your back or neck is what is waking you up or wearing you down, that part is something we can examine here. The causes of fatigue described above are medical, not mechanical, and they belong with your physician. We will tell you plainly which category your situation falls into rather than guessing. Read more about sleep difficulties if broken sleep is part of the picture.

Boss Chiropractic has served Sterling Ridge and The Woodlands since 2001. You can read how we think about this whole area on our holistic health and wellness page, or contact us with a question before you book.

Reviewed and approved by Dr. Christopher Boss, DC, Doctor of Chiropractic since 1998 and the treating chiropractor at Boss Chiropractic. Last updated September 11, 2026.

This page is general information, not medical advice. What is right for you depends on your exam. Dr. Boss will tell you straight whether we can help, and where to go if we cannot.