Diarrhoea after flying

Air travel can bring unfamiliar food, crowded settings, disrupted sleep, and anxiety, any of which may change bowel habits. Diarrhoea with cramps, nausea, or fever can be Gastroenteritis or Food Poisoning; after travel, Giardiasis is another possibility that a clinician may consider. A single episode does not identify the cause. Symptoms that started before the trip or keep returning may fit Irritable Bowel Syndrome, Food Intolerance, Coeliac Disease, or Crohn's Disease. Hyperthyroidism can also affect bowel frequency, so tell a clinician about palpitations, heat intolerance, or other new symptoms.

Replace fluids with frequent sips of safe water; oral rehydration solution can help when stools are frequent. Eat small, familiar meals and avoid alcohol, very fatty foods, and anything that clearly worsens symptoms. Wash hands with soap and water, particularly after using the toilet, and avoid preparing food for others while unwell. Keep details of destinations, meals, drinks, onset, fever, vomiting, and medicines. Do not take antibiotics left over from a previous illness.

Obtain urgent help for blood or black stools, severe abdominal pain, fainting, confusion, repeated vomiting, or inability to drink. Seek medical advice promptly if fever is significant, urine becomes scarce, symptoms continue, or diarrhoea follows recent travel to an area with different food or water exposures. Mention the travel history because it can guide testing and treatment.

Could this be travel-related infection or a food trigger? Do I need stool testing? Which fluids and foods are suitable for me? When is it safe to return to work or travel?