Clinical Signs vs. Symptoms: Objective Findings (Rash, Vital Signs, Labs) vs. Subjective Experiences (Pain, Fatigue, Nausea)

Signs (Objective, Observable)

• Physical: rash, edema, jaundice, clubbing, lymphadenopathy, organomegaly, neurological deficits.
• Vital signs: fever, tachycardia, hypotension, tachypnea, hypoxia.
• Laboratory/imaging: leukocytosis, elevated CRP, electrolyte abnormalities, radiographic infiltrates.

Symptoms (Subjective, Patient-Reported)

• Pain (quality, location, severity)
• Fatigue, malaise
• Weight change (unintentional)
• Feverishness (feeling hot)
• Cough, dyspnea, orthopnea
• Nausea, vomiting, diarrhea, constipation
• Headache, dizziness, syncope
• Cognitive: confusion, memory lapses, concentration difficulty
• Seizure phenomena (aura, automatisms)

Diagnostic Utility

Signs and symptoms rarely pathognomonic; they form constellations (syndromes) that narrow differential diagnosis. Clinicians combine history (symptoms), exam (signs), and testing to reach probability-based diagnoses.