Why Am I So Tired? The Many Causes of Fatigue

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One of the most common complaints that I hear when taking a history from a patient of a current illness is that the patient says, almost as an afterthought "... and I don't know why I am so tired." In most instances, this complaint is not the main reason that the patient is seeing me. In some instances, "being tired" is mentioned to physicians during a routine checkup after the patient said they have no current health concerns. So, should I as a physician treat the comment like an afterthought and concentrate on the "real reason" the patient is being seen? I could focus on the "real reason" for the visit, but if I skip asking questions about "being tired," I may miss finding out information or clues about the patient's illness and completely overlook a potential diagnosis and treatment for the patient.

Therefore, the first thing to understand about "tired" is what the patient means by the word. Does the patient mean they feel sleepy or fatigued -- they are not the same. Fatigued (tired) describes a lack of energy and motivation, not feeling sleepy (although both can occur together). If the answer is fatigue, the next step is to determine if the fatigue is mental, physical, or both. Now we are beginning to narrow down some clues to the cause of the fatigue, but we (the patient and the doctor) still have a long way to go together.

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