Keywords: older people, unsteadiness, dizziness

Why Dizziness Is Often Multifactorial

In older people, dizziness is usually multifactorial. Age-related changes in vision, hearing, balance, blood pressure regulation, muscle strength, and gait can interact with chronic disease, acute illness, medications, and environmental hazards. A problem in one system may be compensated for until another system changes, which is why symptoms can appear suddenly after a minor illness, a new medicine, or a fall.

The same word may also describe different experiences. Some older people use “dizziness” to mean lightheadedness, some mean spinning vertigo, and others mean unsteadiness or a fear of falling. Clarifying what the person actually feels is an important first step.

Dizziness and Unsteadiness Are Not the Same

Dizziness is a broad symptom that can include lightheadedness, faintness, imbalance, or a false sense of movement. Unsteadiness refers more specifically to difficulty maintaining stable posture or gait. The two often overlap: an older person with dizziness may feel unsteady, and an older person with unsteadiness may describe the problem as dizziness.

Unsteadiness may be more noticeable during walking, turning, standing up, or moving in the dark. It can be caused by problems in the inner ear, nerves, muscles, joints, vision, blood pressure, or brain, and it may also be worsened by anxiety about falling.

Common Contributing Factors

• Cardiovascular causes: orthostatic hypotension, heart rhythm problems, heart failure, dehydration, and poor circulation can reduce blood flow to the brain.
• Vestibular causes: benign paroxysmal positional vertigo, vestibular hypofunction, and other inner ear disorders can cause vertigo or unsteadiness.
• Sensory causes: reduced vision, hearing loss, peripheral neuropathy, and decreased proprioception can make balance more difficult.
• Neurologic causes: Parkinsonism, stroke, transient ischemic attack, cerebellar disorders, and cognitive impairment can affect gait and balance.
• Musculoskeletal causes: muscle weakness, arthritis, foot problems, and reduced range of motion can contribute to unsteadiness.
• Systemic causes: anemia, infection, dehydration, thyroid disorders, and poorly controlled diabetes may cause or worsen symptoms.
• Medications: blood pressure medicines, sedatives, antidepressants, antipsychotics, anticonvulsants, and multiple medicines used together can contribute to dizziness or unsteadiness.
• Environmental and functional factors: poor lighting, loose rugs, uneven floors, improper footwear, and fear of falling can increase the risk of instability.

Assessment

A multifactorial assessment should begin with a careful history. It is helpful to ask about the timing, triggers, duration, and associated symptoms of dizziness, as well as falls, near-falls, gait changes, medication use, vision, hearing, and home circumstances.

• Review the person’s full medication list, including over-the-counter products and supplements.
• Check blood pressure while lying, sitting, and standing when appropriate.
• Assess vision, hearing, gait, balance, strength, and joint function.
• Look for signs of vestibular dysfunction, neurologic disease, and cardiovascular problems.
• Consider blood tests, electrocardiography, and other tests when indicated by the history and examination.
• Ask about fear of falling, activity restriction, and previous falls.

Management

Management should target the specific contributors identified during assessment. Because dizziness in older people is often multifactorial, combining several interventions is frequently more effective than treating one possible cause in isolation.

• Optimize medicines with a clinician, especially those that affect blood pressure, alertness, or balance.
• Treat reversible causes such as dehydration, infection, anemia, or metabolic problems.
• Correct vision and hearing problems when possible.
• Recommend balance and strength exercises, and consider vestibular rehabilitation when appropriate.
• Address home hazards and footwear, and support fall prevention.
• Encourage adequate hydration and safe physical activity.
• Review symptoms over time, because new medicines, illnesses, and changes in function can alter the balance of contributing factors.

When to Seek Urgent Help

Urgent medical evaluation is needed for dizziness accompanied by sudden weakness, facial droop, speech difficulty, severe headache, chest pain, palpitations, fainting, head injury, fever, or a new inability to walk. These features may indicate a serious cause that requires prompt attention.

Key Points

• Dizziness in older people is usually multifactorial.
• Unsteadiness may be a symptom of vestibular, neurologic, musculoskeletal, sensory, cardiovascular, or medication-related problems.
• Assessment should consider the whole person, not just the inner ear.
• Medication review, gait and balance assessment, and fall prevention are central parts of care.
• Urgent symptoms require prompt medical evaluation.