I swallowed a lot of seawater. Is my health at risk?

Go to the emergency department or call emergency services immediately if you have any of the following.

• Shortness of breath or difficulty breathing
• Persistent or uncontrollable vomiting
• High fever or chills
• Fainting, altered consciousness, or marked weakness
• Severe abdominal pain or bloody stools

These signs require urgent assessment; do not wait.

Small amounts swallowed once are usually harmless, but the salt in seawater can trigger nausea or vomiting. Swallowing contaminated water can introduce bacteria, viruses or parasites that may cause gastrointestinal or other infections; symptoms often appear within a few days.

• Large amounts of salty water can cause nausea and vomiting
• Contaminated seawater may cause infections such as gastroenteritis or other marine-borne infections
• Symptom severity depends on the person and the contamination level

If symptoms develop, consider medical assessment.

The appropriate service depends on the symptoms you have. The following is a general guide using local specialty names.

• Urgent or severe signs: Emergency Medicine
• Suspected infection (fever, worsening diarrhea over days): Infectious Diseases and Clinical Microbiology
• Digestive symptoms such as diarrhea, abdominal pain or vomiting: Family Medicine or Gastroenterology

Definitive referral should be based on clinical assessment.

Low-risk actions you can take at home for general support; these are not medical treatments.

• Watch for symptoms: nausea, vomiting, fever, abdominal pain, diarrhea or breathing difficulty — seek care if they occur
• Rest and maintain adequate fluid intake if you are well otherwise
• Avoid swallowing water while swimming and avoid known contaminated areas
• Children and older adults may be more vulnerable; seek earlier assessment for these groups if symptoms appear

Supportive measures like fluids and rest are general; a clinician determines treatment if needed.