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Emergency And Acute Medicine – Fatigue
Overview And Definitions
Fatigue is a subjective sensation of overwhelming, persistent exhaustion with reduced capacity for physical and mental activity that is not relieved by rest. It may occur with or without objective abnormalities on physical examination. Fatigue is a frequent complaint among patients both with and without systemic disease, making evaluation challenging in emergency practice.
Etiology And Pathophysiology
The precise mechanisms underlying fatigue are not fully understood. Common contributing categories include hematologic disorders such as anemia and leukemia; endocrine conditions including thyroid disease, adrenal insufficiency, diabetes, and pregnancy; malignancy with paraneoplastic syndromes; psychiatric illness including depression, emotional distress, eating disorders, substance use, and withdrawal; sleep disorders such as insomnia and sleep apnea; cardiac and pulmonary disease; acute and chronic infections; rheumatologic and autoimmune disorders; nutritional deficiencies and electrolyte abnormalities; physical deconditioning; medication effects; and chronic fatigue syndrome. Chronic fatigue syndrome is defined by severe fatigue lasting longer than six months, not explained by medical or psychiatric disease, accompanied by four or more symptoms including headache, arthralgias, sleep disturbance, lymphadenopathy, postexertional malaise, myalgias, impaired concentration or memory, and sore throat.
Clinical Presentation
Fatigue is characterized by persistent tiredness or exhaustion that interferes with daily activities and does not resolve with sleep. While no physical findings are specific, associated signs may suggest an underlying etiology.
History And Physical Examination
History should focus on onset, duration, and progression of fatigue, associated symptoms such as fever, night sweats, dyspnea, weakness, weight changes, and sleep patterns, as well as past medical, surgical, psychiatric, and social history including substance use and recent stressors. Medication review and a full review of systems are essential. Physical examination should be comprehensive and directed toward identifying an underlying cause. Vital signs may reveal infection or metabolic disturbance. HEENT exam may show icterus, pallor, or pupillary abnormalities. Thyroid enlargement or tenderness may suggest dysfunction. Cardiac murmurs or S3 gallop raise concern for heart failure. Pulmonary findings may indicate acute or chronic lung disease. Abdominal masses or tenderness warrant further investigation. Skin findings such as rash, dehydration, or hyperpigmentation may indicate systemic disease. Neurologic examination should assess for focal deficits or true weakness. Musculoskeletal and vascular access sites should be inspected for infection or electrolyte-related complications.
Essential Evaluation
Because fatigue is subjective, evaluation is guided by clinical suspicion based on history and examination, with the goal of identifying reversible or serious underlying conditions.
Diagnostic Studies And Interpretation
Laboratory testing should be selective and include complete blood count to screen for anemia or malignancy, serum glucose to identify hypo- or hyperglycemia, pregnancy testing when appropriate, electrolytes with renal function, thyroid-stimulating hormone to evaluate for hypothyroidism, and urine drug screening when substance use is suspected. Imaging and specialized testing are reserved for abnormalities identified during initial evaluation.
Differential Diagnosis
The differential diagnosis includes infectious etiologies such as bacteremia, pneumonia, viral syndromes, EBV, CMV, HIV, and HHV-6; immunologic and connective tissue diseases; neoplastic disorders; metabolic abnormalities; hematologic disease; endocrine dysfunction; neurologic disorders; cardiovascular disease; pulmonary pathology; gastrointestinal and hepatic disease; autonomic dysfunction; lifestyle-related factors; psychiatric illness; medication effects; and dehydration.
Management And Initial Therapy
Initial management includes assessment of airway, breathing, and circulation, supplemental oxygen for hypoxia, and intravenous fluids for dehydration. Emergency department treatment is directed at identifying and correcting the underlying cause, including treatment of infection, correction of metabolic or hematologic abnormalities, recognition of neurologic or psychiatric emergencies, discontinuation of offending medications, and initiation of appropriate referrals. In many cases no definitive cause is identified, and reassurance with close outpatient follow-up is appropriate. Patients should be counseled on sleep hygiene, nutrition, physical activity, and routine care.
Disposition And Follow Up
Admission is indicated for patients with serious underlying disease requiring inpatient treatment, inability to care for themselves, or failure to thrive as an outpatient. Discharge is appropriate when serious conditions have been excluded, the patient is stable, and reliable follow-up is arranged. Referral should be made to appropriate specialists when an etiology is identified, or to primary care when evaluation is incomplete or ongoing.
Key Clinical Insights And Common Errors
Fatigue is a symptom rather than a diagnosis and requires careful history and physical examination. Absence of abnormal findings does not exclude serious disease. Elderly patients, children, intoxicated individuals, and those with impaired communication may present with fatigue as the only sign of life-threatening illness. Failure to recognize high-risk features or unreliable histories is a common cause of missed diagnoses.
Overview And Definitions
Fatigue is a subjective sensation of overwhelming, persistent exhaustion with reduced capacity for physical and mental activity that is not relieved by rest. It may occur with or without objective abnormalities on physical examination. Fatigue is a frequent complaint among patients both with and without systemic disease, making evaluation challenging in emergency practice.
Etiology And Pathophysiology
The precise mechanisms underlying fatigue are not fully understood. Common contributing categories include hematologic disorders such as anemia and leukemia; endocrine conditions including thyroid disease, adrenal insufficiency, diabetes, and pregnancy; malignancy with paraneoplastic syndromes; psychiatric illness including depression, emotional distress, eating disorders, substance use, and withdrawal; sleep disorders such as insomnia and sleep apnea; cardiac and pulmonary disease; acute and chronic infections; rheumatologic and autoimmune disorders; nutritional deficiencies and electrolyte abnormalities; physical deconditioning; medication effects; and chronic fatigue syndrome. Chronic fatigue syndrome is defined by severe fatigue lasting longer than six months, not explained by medical or psychiatric disease, accompanied by four or more symptoms including headache, arthralgias, sleep disturbance, lymphadenopathy, postexertional malaise, myalgias, impaired concentration or memory, and sore throat.
Clinical Presentation
Fatigue is characterized by persistent tiredness or exhaustion that interferes with daily activities and does not resolve with sleep. While no physical findings are specific, associated signs may suggest an underlying etiology.
History And Physical Examination
History should focus on onset, duration, and progression of fatigue, associated symptoms such as fever, night sweats, dyspnea, weakness, weight changes, and sleep patterns, as well as past medical, surgical, psychiatric, and social history including substance use and recent stressors. Medication review and a full review of systems are essential. Physical examination should be comprehensive and directed toward identifying an underlying cause. Vital signs may reveal infection or metabolic disturbance. HEENT exam may show icterus, pallor, or pupillary abnormalities. Thyroid enlargement or tenderness may suggest dysfunction. Cardiac murmurs or S3 gallop raise concern for heart failure. Pulmonary findings may indicate acute or chronic lung disease. Abdominal masses or tenderness warrant further investigation. Skin findings such as rash, dehydration, or hyperpigmentation may indicate systemic disease. Neurologic examination should assess for focal deficits or true weakness. Musculoskeletal and vascular access sites should be inspected for infection or electrolyte-related complications.
Essential Evaluation
Because fatigue is subjective, evaluation is guided by clinical suspicion based on history and examination, with the goal of identifying reversible or serious underlying conditions.
Diagnostic Studies And Interpretation
Laboratory testing should be selective and include complete blood count to screen for anemia or malignancy, serum glucose to identify hypo- or hyperglycemia, pregnancy testing when appropriate, electrolytes with renal function, thyroid-stimulating hormone to evaluate for hypothyroidism, and urine drug screening when substance use is suspected. Imaging and specialized testing are reserved for abnormalities identified during initial evaluation.
Differential Diagnosis
The differential diagnosis includes infectious etiologies such as bacteremia, pneumonia, viral syndromes, EBV, CMV, HIV, and HHV-6; immunologic and connective tissue diseases; neoplastic disorders; metabolic abnormalities; hematologic disease; endocrine dysfunction; neurologic disorders; cardiovascular disease; pulmonary pathology; gastrointestinal and hepatic disease; autonomic dysfunction; lifestyle-related factors; psychiatric illness; medication effects; and dehydration.
Management And Initial Therapy
Initial management includes assessment of airway, breathing, and circulation, supplemental oxygen for hypoxia, and intravenous fluids for dehydration. Emergency department treatment is directed at identifying and correcting the underlying cause, including treatment of infection, correction of metabolic or hematologic abnormalities, recognition of neurologic or psychiatric emergencies, discontinuation of offending medications, and initiation of appropriate referrals. In many cases no definitive cause is identified, and reassurance with close outpatient follow-up is appropriate. Patients should be counseled on sleep hygiene, nutrition, physical activity, and routine care.
Disposition And Follow Up
Admission is indicated for patients with serious underlying disease requiring inpatient treatment, inability to care for themselves, or failure to thrive as an outpatient. Discharge is appropriate when serious conditions have been excluded, the patient is stable, and reliable follow-up is arranged. Referral should be made to appropriate specialists when an etiology is identified, or to primary care when evaluation is incomplete or ongoing.
Key Clinical Insights And Common Errors
Fatigue is a symptom rather than a diagnosis and requires careful history and physical examination. Absence of abnormal findings does not exclude serious disease. Elderly patients, children, intoxicated individuals, and those with impaired communication may present with fatigue as the only sign of life-threatening illness. Failure to recognize high-risk features or unreliable histories is a common cause of missed diagnoses.
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