# Kerosene and Hydrocarbon Poisoning

> Kerosene and hydrocarbon poisoning for NEET-PG Medicine covering aspiration pneumonitis, why lavage is avoided, radiographic timing and supportive care.

- Canonical URL: https://prepelephant.com/topics/neet-pg/medicine/kerosene-and-hydrocarbon-poisoning
- Exam / course: NEET-PG · Subject: Medicine
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-08
- Last updated: 2026-10-08
- Reference basis: Goldfrank's Toxicologic Emergencies; Nelson Textbook of Pediatrics; Harrison's Principles of Internal Medicine
- How to cite: "Kerosene and Hydrocarbon Poisoning", PrepElephant, https://prepelephant.com/topics/neet-pg/medicine/kerosene-and-hydrocarbon-poisoning

## Direct answer

Kerosene and hydrocarbon poisoning cause harm mainly through aspiration, because low viscosity lets the liquid spread rapidly into the airways and alveoli, producing chemical pneumonitis. Gastric lavage and induced vomiting are avoided because each attempt risks aspiration, and activated charcoal is not used for the same reason. Management is supportive, with serial chest imaging and oxygen monitoring, while prophylactic antibiotics are not routinely given.

## What you must remember

- **Aspiration risk:** Low viscosity and low surface tension let hydrocarbons spread across the alveoli, so aspiration is the principal hazard.
- **Lavage avoided:** Lavage and induced vomiting risk aspiration, so they are reserved for cases where a more toxic co-ingredient is involved.
- **Activated charcoal:** Not recommended, because it adsorbs hydrocarbons poorly and carries an aspiration risk.
- **Radiographic timing:** Pneumonitis may take several hours to appear, so an early normal film does not exclude injury.
- **Late complications:** Pneumatocele formation and pneumothorax may appear over the following days.
- **Systemic toxicity:** Drowsiness and seizures occur, especially in children, and benzene adds bone marrow toxicity.

## A child who swallowed kerosene and now coughs

A 4-year-old boy is brought in 30 minutes after swallowing kerosene from an unlabelled bottle. He is coughing, with a respiratory rate of 40 per minute and crackles at the bases.

1. **Discourage home remedies:** Inducing vomiting should be discouraged.
2. **Position and withhold:** The child is sat upright and kept nil by mouth, and no tube is passed for lavage.
3. **Support breathing:** Oxygen is given if saturation falls, and bronchodilators are used for wheeze.
4. **Take a baseline film:** A chest X-ray is taken on arrival, but a normal film does not settle the question, so it is repeated over the next several hours.
5. **Monitor for warning signs:** Blood gases and saturation are monitored, since hypoxaemia is the first warning of pneumonitis, and drowsiness or seizures are watched for.
6. **Limit drugs:** Antibiotics are reserved for documented infection, and corticosteroids are not used routinely.

A normal early film does not end observation, because radiographic change lags behind the injury.

## Where the exam tries to catch you

Hydrocarbon questions reward the aspiration rationale over routine decontamination logic.

- **Trap:** Treating hydrocarbons like other oral poisons. — **Correct:** Lavage is standard for many ingestions, but here the aspiration rationale overrides usual decontamination logic.
- **Trap:** Assuming the aspiration rationale applies to caustic ingestion. — **Correct:** Lavage is also avoided, but for a different reason: a tube can perforate an already damaged oesophagus, and the injury is mucosal rather than pneumonitic.
- **Trap:** Accepting a clear chest film at one hour. — **Correct:** Radiographic change lags behind injury, so an early normal film is not reassuring.
- **Trap:** Ignoring systemic toxicity from benzene or turpentine. — **Correct:** Benzene adds marrow suppression and turpentine can injure the kidneys, so systemic features change the expected answer.

## Frequently asked questions

### Why is gastric lavage avoided in kerosene poisoning?

Gastric lavage is avoided because the procedure and any vomiting it provokes carry a high risk of aspirating low-viscosity hydrocarbons into the lungs. Aspiration pneumonitis is the principal danger, so the approach is to observe, support breathing and avoid procedures that cause vomiting.

### Why can a normal chest X-ray not exclude pneumonitis after hydrocarbon aspiration?

Hydrocarbon pneumonitis can take several hours to appear on imaging, so an early film may look normal even when injury has occurred. Serial chest radiographs and oxygen saturation monitoring over the following hours are therefore needed.

### Are prophylactic antibiotics recommended after kerosene aspiration?

Prophylactic antibiotics are not routinely recommended after kerosene aspiration, because the initial injury is chemical rather than bacterial. Antibiotics are reserved for documented infection or secondary pneumonia that develops later.

### Which hydrocarbon causes more systemic toxicity than kerosene?

Aromatic hydrocarbons such as benzene cause systemic toxicity, including bone marrow suppression, and turpentine can injure the kidneys. Kerosene primarily causes pneumonitis, so the aspiration pattern remains the usual clinical picture.