Natural Gas Exposure: Symptoms, Immediate Actions & Medical Treatment

Natural gas (methane) exposure is a medical emergency. It displaces oxygen (asphyxiation risk) and contains odorant (mercaptan) but can be odorless in high concentrations or if olfactory fatigue occurs.

Immediate Actions

1. EVACUATE immediately—do not toggle switches, use phones, or create sparks.
2. Call 911 from a safe location (outside).
3. Do not re-enter until fire department / gas company declares safe.
4. Seek medical evaluation even if asymptomatic—delayed effects occur.

Acute Symptoms

Medical Treatment

• 100% oxygen via non-rebreather mask (displaces methane, corrects hypoxia).
• Hyperbaric oxygen (HBO) if CO co-exposure suspected (carboxyhemoglobin >25%, neurologic signs, pregnancy).
• Supportive: IV fluids, cardiac monitoring, seizure prophylaxis, treat comorbidities.
• Observation: 6–24 h for delayed neuropsychiatric sequelae (DNS).

Prevention

• Install methane/natural gas detectors (not just CO detectors) near gas appliances & bedrooms.
• Annual professional inspection of gas lines, furnace, water heater, stove.
• Know the smell (rotten egg); teach household members.
• If you smell gas: Leave. Call 911. Do not investigate.

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System	Symptoms
Neurologic	Headache, dizziness, confusion, ataxia, syncope, seizures
Respiratory	Dyspnea, tachypnea, hypoxia, cyanosis
GI	Nausea, vomiting, abdominal pain
Cardiac	Palpitations, arrhythmias, ischemia (from hypoxia)
Other	Eye/throat irritation, fatigue, cherry-red skin (rare, CO co-exposure)