Stomach flu lasting two weeks: what to know

Stomach flu usually refers to gastroenteritis, an irritation or infection of the stomach and bowel; it is not influenza. Symptoms can include diarrhoea, abdominal pain, nausea, fever and loss of appetite. Ongoing symptoms may reflect continuing infection, irritation after an infection, medication effects, food intolerance, or another bowel condition. Rotavirus infection is one possible cause, especially in children. Two weeks of symptoms makes the original label less certain, so a clinician may need to review hydration, recent travel, food exposure, medicines, medical conditions and whether symptoms are improving or changing.

Arrange a medical appointment and keep a simple symptom record: stool frequency and appearance, pain location, vomiting, temperature, urine output, appetite, weight change, travel, and recent antibiotics. Sip fluids often; oral rehydration fluids can help replace water and salts lost through diarrhoea or vomiting. Eat small portions as tolerated and avoid alcohol. Wash hands with soap and water, clean bathroom surfaces, and avoid preparing food for others while diarrhoea continues. Do not take antibiotics left from an earlier illness. A clinician may consider blood or stool testing and review medicines or other conditions.

Get urgent help for confusion, fainting, severe weakness, severe or worsening abdominal pain, a swollen abdomen, blood or black stool, repeated vomiting, or inability to keep fluids down. Seek prompt assessment for very little urine, marked dizziness, persistent fever, rapid deterioration, or signs of dehydration. Children, older adults, pregnant people, and those with weakened immunity should seek advice sooner because fluid loss can become dangerous more quickly.

Could this still be gastroenteritis, or should another cause be investigated? Do I need stool or blood tests? How can I replace fluids safely, and which symptoms mean I should seek urgent care?