Fever ≥100°F (37.8°C): When to Seek Medical Attention

Fever is a protective immune response, but ≥100°F (37.8°C) warrants clinical evaluation, especially with red flags.

Red Flag Symptoms Requiring Immediate Care

• Severe headache + neck stiffness (meningitis concern)
• Altered mental status: confusion, lethargy, difficulty arousing
• Seizures
• Persistent vomiting or diarrhea (dehydration risk)
• Shortness of breath, chest pain
• Rash (petechial/purpuric = meningococcemia)
• Immunocompromised state (chemo, steroids, HIV, transplant)
• Age <3 months (any fever) or >65 with frailty
• Fever >103°F (39.4°C) or >48 hours duration

Home Management (If No Red Flags)

• Antipyretics: Acetaminophen 10–15 mg/kg q6h or ibuprofen 10 mg/kg q6h (alternate if needed). Avoid aspirin <18 yrs (Reye's risk).
• Hydration: Water, electrolyte solutions, broth; monitor urine output.
• Rest: Avoid exertion; light clothing, cool environment.
• Physical cooling: Tepid bath, cool compresses (avoid ice/alcohol rubs).

Follow-Up Triggers

• Fever persists >24–48 hours (adults) or >24 hours (children).
• New symptoms develop.
• Underlying condition flare (e.g., lupus, IBD).

When in doubt, contact a clinician. Telehealth triage can prevent unnecessary ED visits.