Hair loss: Differential Diagnosis by Symptom Pattern

• •Character of pain and exertional trigger
• •Hemodynamic instability, pulse pattern, and blood pressure
• •ECG and cardiac biomarkers trend

• •Morphology and distribution of skin findings
• •Trigger/exposure timing and recurrence pattern
• •Systemic involvement (airway, hemodynamics, fever)

• •Subacute/chronic course with metabolic trigger profile
• •Weight, appetite, and temperature regulation changes
• •Lab pattern consistency across repeated tests

• •Pain location and relation to meals
• •Stool pattern (watery, bloody, greasy) and vomiting profile
• •Associated systemic signs such as fever or jaundice

• •Prioritize red flags and severe progression first
• •Use focused history + exam to define the leading organ system

Immediate testing when red flags are present

• •Focused examination with baseline labs if symptoms persist
• •Escalate to urgent workup when red flags appear

Group-directed workup

• •ECG
• •Troponin
• •Blood pressure in both arms
• •Echocardiography when indicated
• •Focused skin exam
• •Allergy workup when indicated
• •Infection swab/culture when needed
• •Biopsy in atypical persistent lesions