explain history taking
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History Taking
History taking is the structured process by which a clinician gathers information about a patient's illness through systematic questioning. It is the single most important step in clinical diagnosis - studies suggest that a correct diagnosis can be reached from history alone approximately 70% of the time.
The physician's dialogue with the patient is the most important asset for enhancing the physician-patient relationship and formulating treatment, yet it is often underused. - Sleisenger and Fordtran's Gastrointestinal and Liver Disease
The Art and Technique of Interviewing
Before jumping to components, the approach matters:
- Use open-ended questions first - "How can I help you?" lets the patient tell their story naturally
- Use facilitating expressions - "Yes?", "Can you tell me more?", head nodding, or even a silent pause with an expectant look
- Avoid closed-ended (yes/no) questions initially; use them only later to characterize symptoms further
- Never use leading questions - "Doesn't the pain move to the right scapula?" will get a "yes" from a cooperative patient regardless of truth
- Let the patient speak in their own words - record symptoms in the patient's language, not in scientific/medical terms
- Never ask "What are you suffering from?" - the patient will give you a diagnosis (theirs or a previous doctor's), not a symptom history
- Integrate medical and social history together - the medical problem should be described in the context of psychosocial events surrounding the illness
The Components of History Taking
1. Patient Particulars (Biographical Data)
Knowing the patient personally has both diagnostic and psychological value. Key details:
| Detail | Clinical Relevance |
|---|---|
| Name | Builds rapport; patient feels recognized |
| Age | Congenital anomalies present early; sarcomas in teenagers; carcinomas after 40; BPH in old age |
| Sex | Thyroid disease, visceroptosis commoner in females; stomach/lung/kidney cancers commoner in males; haemophilia only in males |
| Religion | Carcinoma of penis rare in Jews/Muslims (circumcision); intussusception may follow prolonged fasting |
| Social status | Appendicitis more common in high social status; TB more common in low social status due to malnutrition |
| Occupation | Varicose veins in bus conductors; bladder tumours in aniline dye workers; "tennis elbow" in racquet players; knee cartilage injuries in footballers/miners |
| Residence | Geographical diseases: filariasis in certain regions, gallbladder disease in specific populations |
- S Das: A Manual on Clinical Surgery, 13th Edition
2. Chief Complaints (CC)
The complaints are recorded in chronological order of appearance, with duration noted for each.
- Ask: "What are your complaints?" or "What brings you here?"
- Always ask: "Were you perfectly well before this started?" - this establishes the baseline and may uncover previously unreported symptoms
- If multiple complaints began simultaneously, list them in order of severity
Example format:
- Swelling in the neck - 1 year
- Fever (evening) - 10 months
- Pain over swelling - 6 months
- Sinus in neck - 1 month
3. History of Present Illness (HPI)
This is the core narrative of the illness - from the first symptom to the time of examination. It covers:
(i) Mode of onset - Was it sudden or gradual? Was there a precipitating cause?
- Ask: "How did the trouble start?"
(ii) Progress of disease - Evolution of symptoms in exact chronological order
- Ask: "What is the next thing that happened?"
(iii) Previous treatment - What treatment has the patient received, from whom, and what was the response?
For any symptom (e.g., pain), a systematic characterization is needed using the SOCRATES or similar mnemonic:
| Feature | Questions to ask |
|---|---|
| Site | Where exactly is it? |
| Onset | When did it start? Sudden or gradual? |
| Character | What does it feel like? (burning, stabbing, colicky, dull) |
| Radiation | Does it spread anywhere? |
| Associated symptoms | Any fever, nausea, vomiting, weight loss? |
| Timing | Constant or intermittent? Any pattern? |
| Exacerbating/Relieving factors | What makes it worse or better? |
| Severity | On a scale of 1-10; does it disrupt sleep/work? |
4. Past Medical History (PMH)
- Previous illnesses, hospitalizations, surgeries, and their outcomes
- Previous similar episodes - "Has this happened before?"
- Relevant childhood illnesses
- Allergies (especially to drugs, latex, contrast media)
- Previous blood transfusions
5. Drug History
- All current medications (prescribed, over-the-counter, herbal/traditional)
- Dose, duration, and compliance
- Any recent changes to medication
- Adverse reactions to medications
This is particularly important as many drugs can cause or mimic disease (e.g., NSAIDs causing peptic ulcers, ACE inhibitors causing cough).
6. Family History
- First-degree relatives (parents, siblings, children) with relevant illnesses
- Important for genetic conditions: diabetes, hypertension, coronary artery disease, cancers, haemophilia, sickle cell disease
- Consanguinity (marriage between relatives) - relevant in autosomal recessive conditions
7. Social History
- Smoking - pack-year history (packs per day x years)
- Alcohol - units per week; binge vs regular
- Recreational drug use - type, route (IV drug use = risk for hepatitis B/C, HIV)
- Diet and nutrition
- Living conditions - housing quality, who they live with, support structure
- Travel history - especially for tropical or endemic diseases
- Sexual history - when relevant (STIs, HIV risk factors)
- Occupation - current and previous (occupational hazards)
- Exercise tolerance - a marker of baseline functional status
8. Systemic Enquiry (Review of Systems)
A head-to-toe checklist to catch symptoms the patient may not have mentioned, believing them unrelated. Key domains:
| System | Key symptoms to ask about |
|---|---|
| Cardiovascular | Chest pain, palpitations, dyspnoea, ankle swelling, orthopnoea |
| Respiratory | Cough, sputum, haemoptysis, wheezing, breathlessness |
| GI | Appetite, nausea, vomiting, dysphagia, abdominal pain, bowel habits, rectal bleeding |
| Urological | Frequency, dysuria, haematuria, nocturia, incontinence |
| Neurological | Headache, dizziness, fits, weakness, sensory changes, visual disturbance |
| Musculoskeletal | Joint pain/swelling, muscle weakness, back pain |
| Endocrine | Weight change, heat/cold intolerance, polyuria, polydipsia |
| Skin | Rashes, lumps, pigmentation changes, jaundice |
Key Principles Summarized
- Listen first - the patient's narrative is the most valuable diagnostic tool
- Open then focus - start broad, then narrow with specific questions
- Never lead - open-ended questions prevent biased responses
- Context matters - symptoms must be understood within the patient's life circumstances
- Record accurately - use the patient's words, not medical jargon
- Chronology is everything - the sequence of symptom evolution often reveals the diagnosis
As S Das: A Manual on Clinical Surgery puts it: the patient knows more about their complaints than the doctor. The clinician's role is to draw out that story systematically, without contaminating it.
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