What workup and treatment are indicated for a patient with one month of fatigue and dizziness?

Workup and Management of Fatigue and Dizziness for One Month

For a patient presenting with one month of fatigue and dizziness, begin with quantitative fatigue screening using a 0-10 numeric scale and focused assessment of dizziness timing/triggers, followed by targeted laboratory evaluation (CBC with differential, comprehensive metabolic panel, TSH) and systematic evaluation of treatable contributing factors including anemia, endocrine dysfunction, sleep disturbances, medications, nutritional deficiencies, and deconditioning. 1

Initial Screening and Assessment

Fatigue Evaluation

• Screen fatigue severity using a 0-10 numeric rating scale where 0 = no fatigue and 10 = worst fatigue imaginable 1
  • Mild fatigue: 1-3
  • Moderate fatigue: 4-6
  • Severe fatigue: 7-10
• Patients scoring 4-10 require comprehensive focused assessment 1

Dizziness Characterization

• Determine timing pattern: episodic vs. continuous vs. triggered 2, 3
• Identify specific triggers: positional changes, head movements, standing 2
• The five most common categories are vasovagal syncope/orthostatic hypotension (22.3%), vestibular causes (19.9%), fluid/electrolyte disorders (17.5%), circulatory/pulmonary causes (14.8%), and central vascular causes (6.4%) 3

Focused History Components

Fatigue-Specific History

• Onset, pattern, duration, and change over time 1
• Associated or alleviating factors 1
• Interference with daily activities and function 1
• Postexertional malaise (worsening after physical or mental exertion—critical for identifying myalgic encephalomyelitis/chronic fatigue syndrome) 4

Review of Systems for Treatable Factors

Systematically assess these specific contributing factors:

Sleep disturbances 1

• Sleep quality, duration, and pattern
• Sleep apnea symptoms (snoring, witnessed apneas)
• Poor sleep hygiene (irregular schedule, daytime napping, caffeine/alcohol before bed, screen time)
• Consider Pittsburgh Sleep Quality Index questionnaire 1

Emotional distress 1

• Depression symptoms
• Anxiety
• Mood changes

Pain assessment 1

• Location, severity (use VAS 0-10 scale)
• Impact on function

Nutritional factors 1

• Weight changes
• Caloric intake changes
• Impediments to eating (nausea, loss of appetite, dysphagia)

Activity level and deconditioning 1

• Changes in exercise patterns
• Ability to perform activities of daily living
• Functional capacity

Medication review 1

• All prescription medications (especially beta-blockers, narcotics, antidepressants, antiemetics, antihistamines)
• Over-the-counter medications
• Herbal supplements and vitamins
• Recent medication changes

Substance use 1

• Alcohol consumption
• Drug abuse

Physical Examination

Essential Components

• Orthostatic vital signs: blood pressure and heart rate supine and after 1-3 minutes standing 2, 3
• Cardiac examination: rate, rhythm, murmurs 2
• Neurologic examination: complete assessment including cranial nerves, strength, sensation, coordination, gait 2, 3
• Assessment for nystagmus 2, 3

Dizziness-Specific Maneuvers

• Dix-Hallpike maneuver for patients with triggered/positional dizziness to evaluate for benign paroxysmal positional vertigo 2
• HINTS examination (Head Impulse, Nystagmus, Test of Skew) when acute vestibular syndrome is suspected to distinguish peripheral from central causes 2, 3

Laboratory Evaluation

Perform these tests based on moderate-to-severe fatigue (score ≥4) or concerning features: 1

• Complete blood count with differential 1

  • Compare current hemoglobin/hematocrit with any prior values
  • Assess all cell lines (WBC, platelets)

• Comprehensive metabolic panel 1

  • Electrolytes (sodium, potassium, calcium, magnesium)
  • Hepatic function
  • Renal function

• Endocrinologic evaluation 1

  • TSH (thyroid-stimulating hormone)
  • Consider morning cortisol and ACTH if adrenal insufficiency suspected (especially with orthostatic hypotension, electrolyte abnormalities) 1
  • Consider more comprehensive endocrine evaluation or specialist referral if additional symptoms present

• Additional testing based on clinical suspicion 1

  • Vitamin B12, folate
  • Ferritin and iron studies (even without anemia, iron deficiency may contribute to fatigue)
  • Vitamin D
  • Zinc, vitamin B6 if malabsorption suspected

Treatment Approach

Address Treatable Contributing Factors First

This is the priority before specific fatigue interventions 1

Anemia and iron deficiency 1

• Correct with appropriate supplementation
• Iron therapy even for iron deficiency without anemia

Endocrine dysfunction 1

• Thyroid hormone replacement if hypothyroid (goal free T4 in upper half of reference range)
• Hydrocortisone 15-20 mg in divided doses for adrenal insufficiency (2/3 morning, 1/3 early afternoon)
• Refer to endocrinology for complex cases

Electrolyte imbalances 1

• Correct sodium, potassium, calcium, magnesium abnormalities with appropriate supplementation

Sleep disturbances 1

• Cognitive behavioral therapy for insomnia (treatment of choice for adults)
• Sleep hygiene education: regular schedule, dark/quiet environment, avoid screens/caffeine/alcohol before bed
• Evaluate and treat sleep apnea if suspected

Depression and anxiety 1

• Consider antidepressant therapy
• Refer to mental health professional when appropriate

Pain management 1

• Treat underlying pain conditions
• Avoid chronic opioid use (associated with increased mortality and serious infections)

Medication optimization 1

• Reduce or discontinue medications contributing to fatigue when possible
• Adjust dosing or timing of necessary medications

Nutritional deficiencies 1

• Restore vitamin B6, B12, folate, zinc, vitamin D as needed
• Refer to dietitian for substantial abnormalities

Physical Activity Intervention

This is a cornerstone of fatigue management 1

• Actively encourage 150 minutes of moderate aerobic exercise per week (fast walking, cycling, swimming) plus 2-3 strength training sessions 1
• Walking programs are generally safe and can begin after physician consultation without formal exercise testing 1
• Start with low-level activities and gradually increase, especially if significantly deconditioned 1
• Important caveat: Exercise can be harmful in myalgic encephalomyelitis/chronic fatigue syndrome if postexertional malaise is present—these patients require pacing strategies instead 4
• Refer patients at higher risk of injury (neuropathy, cardiomyopathy) to physical therapy 1

Dizziness-Specific Treatment

• Canalith repositioning procedures (Epley maneuver) for benign paroxysmal positional vertigo 2
• Vestibular rehabilitation for many peripheral and central vestibular causes 2, 5
• Treat specific underlying causes identified (cardiac, neurologic, metabolic)
• Avoid vestibular suppressants in chronic dizziness as they impede central compensation 5

Education and Counseling

• Provide specific education about the difference between normal fatigue and pathologic fatigue 1
• Explain that fatigue may persist after treatment and discuss contributing factors 1
• Offer guidance on self-monitoring fatigue levels 1
• Teach general fatigue management strategies 1

Specialist Referral Considerations

Refer when appropriate to: 1

• Endocrinology: for complex hormonal deficiencies, adrenal insufficiency requiring stress-dose education 1
• Cardiology: for cardiac dysfunction contributing to symptoms 1
• Mental health professional: for significant depression, anxiety, or emotional distress 1
• Physical therapy/physiatry: for vestibular rehabilitation or supervised exercise programs 1, 2
• Neurology: for concerning central causes of dizziness or unexplained neurologic findings 2, 3

Follow-Up and Monitoring

• Re-evaluate regularly to determine if treatment is effective 1
• Screen for fatigue at least annually using quantitative assessment 1
• Adjust treatment plan based on response and emerging symptoms 1

Critical Pitfalls to Avoid

• Do not assume fatigue and dizziness are benign without systematic evaluation—central causes of dizziness (6.4% of cases) require urgent intervention 3
• Do not prescribe exercise for patients with postexertional malaise as this can trigger severe worsening in myalgic encephalomyelitis/chronic fatigue syndrome 4
• Do not overlook medication side effects—combinations of narcotics, antidepressants, antiemetics, and antihistamines commonly cause excessive fatigue 1
• Do not use chronic vestibular suppressants as they impede central compensation mechanisms 5
• Do not miss adrenal insufficiency—consider this diagnosis with fatigue, dizziness, and orthostatic hypotension, as it requires immediate treatment and patient education on stress dosing 1