History taking of nervous system

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History Taking of the Nervous System

Based on Bradley and Daroff's Neurology in Clinical Practice, Chapter 1: Diagnosis of Neurological Disease

Why History is Central in Neurology

In neurology more than any other specialty, the history is the cornerstone of diagnosis. What makes neurology unique is the dual emphasis on localization (where is the lesion?) and phenomenology (what kind of process is it?). An accurate, detailed history allows the neurologist to formulate a hypothesis about the anatomical site and disease mechanism before examining the patient - and then the examination confirms or refines that hypothesis.

The Neurological Interview

Setting the Tone

The neurologist should present an empathetic demeanor and put the patient at ease before diving in. Ice-breaking opening questions are useful:

"What type of work have you done most of your life?"
"Are you right- or left-handed?" (establishes cerebral dominance)
"How can I be of service?" / "What is bothering you the most?"

For children: "Where do you go to school?" or "What sports do you enjoy?"

Establishing the patient's expectations from the visit is also important - some want a diagnosis confirmed, others want to be reassured a serious condition is absent.

Components of the Neurological History

1. Chief Complaint

The chief complaint is the starting point and:

Focuses attention on the history questions to be asked
Provides the first anatomical clue (e.g., headache + clumsiness + diplopia → posterior fossa)
Gives insight into the patient's understanding of their own illness

Mode of onset is critically important:

Onset Pattern	Likely Mechanism
Sudden (seconds/minutes)	Stroke, haemorrhage
Exacerbations and remissions	Demyelination (MS)
Slowly progressive	Neoplasm, degenerative disease
Paroxysmal episodes	Seizures, migraine, paroxysmal dyskinesia

2. History of the Present Illness (HPI)

The temporal-severity profile of each symptom is the most critical information to extract. Key dimensions to characterize for every symptom:

Onset - sudden vs. gradual, exact date/time if possible
Duration - seconds, minutes, hours, days, weeks
Progression - static, improving, worsening, fluctuating
Severity - maximal from onset (haemorrhage) vs. building over time (tumour)
Location - focal vs. diffuse, unilateral vs. bilateral
Precipitating/relieving factors - posture, activity, heat (Uhthoff's in MS), sleep
Associated symptoms - headache, nausea/vomiting, fever, rash

Practical example: Headache + hemiplegia appearing gradually over weeks suggests a space-occupying lesion; the same two symptoms appearing in seconds with maximal severity from onset suggest intracerebral haemorrhage. The symptoms may look identical at the time of consultation, but the temporal profile leads to entirely different diagnoses.

Often patients will give a clear history, but in some cases:

The neurological illness itself impairs the patient's ability to give an accurate account (aphasia, dementia, altered consciousness)
An informant history from family, friends, or witnesses is essential - especially for seizures, episodic confusion, or sudden loss of consciousness
Previous medical records should be actively sought and reviewed

3. Review of Patient-Specific Information

This includes:

Handedness - establishes cerebral dominance (language is typically left-hemisphere in right-handed individuals)
Occupation - toxin/solvent exposure, repetitive strain injuries, stress
Education level - calibrates baseline cognitive function for interpretation of mental status testing

4. Review of Systems

A systematic neurological review of systems should cover:

Cortical/Cognitive:

Memory problems (short-term vs. long-term)
Language difficulties (word-finding, comprehension, reading, writing)
Confusion, disorientation, personality/behaviour change

Cranial Nerve Symptoms:

Visual changes - blurring, double vision (diplopia), visual loss (one eye vs. both)
Diplopia: Is it monocular (refractive/ocular) or binocular (neurological)?
Hearing loss, tinnitus, vertigo
Facial numbness or weakness
Dysphagia (swallowing difficulty), dysarthria (slurred speech)
Anosmia (smell loss - olfactory nerve)

Motor:

Weakness - focal vs. generalised, proximal vs. distal
Wasting/atrophy
Involuntary movements - tremor, tics, chorea, myoclonus

Sensory:

Numbness, tingling (paraesthesia), burning pain
Distribution: glove-and-stocking (neuropathy) vs. dermatomal (radiculopathy) vs. hemisensory (central)

Autonomic:

Bladder/bowel dysfunction (retention, incontinence)
Sexual dysfunction
Orthostatic dizziness (postural hypotension)
Sweating abnormalities

Cerebellar:

Imbalance, incoordination, falls, ataxic gait

Headache:

Site, character, severity (1-10), radiation
Timing, frequency, duration
Warning symptoms (aura in migraine)
Precipitants, relieving factors

5. History of Previous Illnesses

Previous neurological episodes (TIAs, prior strokes, seizures)
Systemic diseases with neurological involvement: diabetes (neuropathy), hypertension (stroke), SLE, HIV, malignancy
Previous head or spinal trauma
Past surgeries and anaesthetic events
Medications - many cause neurological side effects (e.g., neuroleptics → parkinsonism; statins → myopathy; metronidazole → neuropathy)
Vaccinations and recent infections (Guillain-Barré follows infections)

6. Family History

Neurological diseases with strong genetic components require careful pedigree construction:

Epilepsy, migraine, stroke (especially young)
Muscle diseases (muscular dystrophies, myotonias)
Peripheral neuropathies (CMT disease)
Hereditary ataxias (SCA types, Friedreich's)
Huntington's disease
Neurodegenerative dementias (familial Alzheimer's, frontotemporal dementia)
Channelopathies (episodic ataxia, periodic paralysis)
Neurocutaneous syndromes (neurofibromatosis, tuberous sclerosis)

For genetic conditions: the pattern of inheritance (autosomal dominant/recessive, X-linked, mitochondrial), age of onset across generations, and penetrance are all relevant.

7. Social History

Occupation - chemical/toxin exposure, physical demands, stress
Alcohol use - cerebellar degeneration, Wernicke's encephalopathy, peripheral neuropathy
Drug use - recreational drugs can cause stroke (cocaine), neuropathy, or encephalopathy
Tobacco - risk factor for stroke and vascular dementia
Travel history - tropical infections (neurocysticercosis, cerebral malaria, meningitis outbreaks)
Sexual history - syphilis, HIV (both cause CNS disease)
Diet - B12 deficiency (subacute combined degeneration), thiamine deficiency (Wernicke's)
Living situation - independence, support available, safety (important for epilepsy patients)

Special Considerations in History Taking

Patients Unable to Give History

When the patient cannot give a reliable history (due to aphasia, dementia, altered consciousness, or very young age):

Eyewitness/informant accounts are essential
For episodic loss of consciousness - a bystander description is often more diagnostic than any investigation

Episodic Symptoms

Ask specifically about:

What triggers the episode?
What happens at onset, during, and after?
Duration of the episode
Recovery time and post-ictal confusion (favours seizure over syncope)
Any warning (aura before migraine or seizure; prodrome of vasovagal syncope)

The Temporal Profile Summary (Key Teaching Point)

Profile	Likely Pathology
Maximal at onset, then improving	Vascular (stroke, TIA)
Progressive over hours-days	Inflammatory, infective
Progressive over weeks-months	Neoplasm, subacute degeneration
Progressive over years	Neurodegenerative disease
Relapsing-remitting	Demyelination (MS), channelopathies
Paroxysmal (seconds-minutes)	Epilepsy, TIA, migraine, movement disorders

Practical Approach: The Neurologist's Reasoning During History

At each step of history taking, the experienced neurologist is simultaneously asking:

Where is the lesion? (Anatomical localisation - cortex? Brainstem? Spinal cord? Peripheral nerve? Muscle?)
What is the mechanism? (Vascular, inflammatory, neoplastic, degenerative, toxic/metabolic, traumatic, genetic)
What are the most likely diagnoses? (Differential diagnosis ranked by probability)

The history provides the best clues to localisation and mechanism. The examination then confirms the anatomical site. Investigations are directed by the hypothesis generated from the history and examination - not performed blindly.

Sources: Bradley and Daroff's Neurology in Clinical Practice, Chapter 1 (Diagnosis of Neurological Disease), pp. 24-110

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