Stomach bug for over a week: what to know

Stomach-bug symptoms lasting over a week should be reviewed by a clinician because prolonged diarrhoea or vomiting may have another cause. Gastroenteritis is possible, but ongoing symptoms can lead to dehydration, poor nutrition and weakness, even when the original infection is improving.

Gastroenteritis may leave the bowel sensitive after the worst vomiting has passed, so loose stools or reduced appetite can linger. Other possibilities include a continuing infection, a medicine effect, temporary difficulty digesting certain foods or an inflammatory bowel condition. Rotavirus is one infectious cause. The clinician will want to know whether stools are watery, greasy or bloody; whether pain is localised; whether fever continues; and whether weight, urine output or energy has changed. These details help distinguish recovery from a problem needing treatment.

Book a medical appointment and take a list of medicines, supplements, recent travel, food exposures and any sick contacts. Continue drinking regularly; oral rehydration fluids may help replace water and salts lost through diarrhoea. Eat small portions as tolerated rather than stopping food for long periods. Avoid alcohol and be cautious with foods that clearly worsen symptoms. Wash hands with soap and water, clean bathroom surfaces and avoid preparing food for others while diarrhoea continues. Do not start antibiotics without advice.

Seek urgent care for blood or black stool, severe or worsening abdominal pain, repeated vomiting, confusion, faintness, severe weakness or very little urine. A high or persistent fever, a swollen abdomen, or inability to drink also needs prompt assessment. Seek earlier advice for a young child, older adult, pregnancy or a condition affecting immunity, kidneys or the heart. A clinician may examine you and decide whether stool or blood tests are needed.

What causes should be considered when symptoms last this long? Do I need stool or blood tests? Which foods, fluids and medicines are sensible while my bowel recovers? What signs mean I should seek emergency care?