Patient Interview and Presenting Complaint History

The Chief Complaint and History of Presenting Complaint (HPC)

The Chief Complaint

The chief complaint is the principal reason the patient is seeking care. It is critical to record this using the patient's own words. A clinician must resist the urge to convert the complaint into a diagnosis prematurely. For instance, if a patient says, "My gums are shrinking," the clinician should document that specific phrase rather than recording "gingival recession," which is a clinical interpretation that follows examination.

History of Presenting Complaint (HPC)

The HPC is a coherent, chronological account of the symptoms that led to the visit. It moves from the initial complaint to a detailed timeline of what happened, what changed, and what is occurring now.

To build a strong HPC, clinicians should use a framework covering the following elements:

• Onset: Was it sudden or gradual? What was happening at the time?
• Duration and Course: How long has it lasted? Is it continuous or intermittent? Is it stable, improving, or worsening?
• Location: Is it localized, multifocal, or diffuse? (Ask the patient to point to the site).
• Character/Quality: What does it feel like? (e.g., sharp, dull, burning, or tingling).
• Severity: Use functional impact (e.g., difficulty eating or sleeping) rather than relying solely on subjective 0-10 scales.
• Aggravating and Relieving Factors: Does spicy food, brushing, or specific medications change the sensation?.
• Associated Symptoms: Are there systemic signs like fever, swelling, bleeding, or weight loss?.
• Previous Episodes/Treatment: Has this happened before, and did previous treatments help?.

Comprehensive Histories

A complete history requires gathering data across several specific domains to ensure patient safety and diagnostic accuracy.

Medical and Medication History

Systemic health status directly influences dental decisions. A medical history is not just a form to be filed; it is clinical information to be interpreted.

• Medical History: Focus on cardiovascular, respiratory, endocrine, renal, and immune disorders, as well as cancer history and recent hospitalizations.
• Medication History: Record the Name, Dose, Frequency, and Indication. It is vital to include prescription drugs, over-the-counter medications, and herbal supplements. Certain medications can cause oral side effects like xerostomia (dry mouth), gingival enlargement, or impaired healing.
• Allergy History: Differentiate between a true allergy (immune-mediated reactions like anaphylaxis) and an adverse effect (such as nausea or headache). Always ask, "What happens when you take it?" to clarify the reaction.

Dental, Family, and Social History

• Dental History: Understanding previous dental experiences, such as anxiety or complications with local anesthesia, helps shape how the patient behaves in the present.
• Family History: Focus on targeted, relevant questions regarding genetic predispositions, such as bleeding disorders or certain cancers.
• Social History: This includes lifestyle factors like tobacco, alcohol, and cannabis/vaping use. When asking about substance use, maintain a neutral, non-judgmental tone to ensure the patient provides accurate information.

Clinical Note: Quantifying Tobacco Use When documenting tobacco exposure, use the formula: Type $\times$ Amount $\times$ Duration.

Synthesizing Information: Problem Representation

The ultimate goal of the interview is to synthesize the gathered data into a problem representation. This is a concise, one-to-two sentence summary that compresses the most important information while excluding distracting details.

A useful problem representation follows the formula: $\text{WHO} + \text{WHAT} + \text{WHERE} + \text{WHEN} + \text{KEY CONTEXT}$.

Example: "A 58-year-old patient with a 6-week history of a persistent painless white patch on the left lateral tongue, with no previous episodes and a long history of tobacco exposure.".

Note that this summary is not a diagnosis; rather, it is a clinical tool designed to guide the subsequent physical examination and the development of a differential diagnosis.

Red Flags and Urgency

During the history-taking process, clinicians must remain vigilant for "red flags"—symptoms that indicate a high level of clinical concern. These include:

• Persistent unexplained lesions or swelling.
• Unexplained bleeding or numbness.
• Dysphagia (difficulty swallowing) or persistent hoarseness.
• Unexplained weight loss.

The presence of these symptoms should immediately increase the sense of urgency, potentially moving the patient from a routine assessment to a prompt referral.