What happens if gastroenteritis is not treated?

Gastroenteritis inflames the stomach and intestines, commonly causing vomiting, loose stools, nausea, reduced appetite and sometimes Fever. Each episode can remove water and salts from the body. If losses are not replaced, thirst, dry mouth, dizziness, headache, tiredness and reduced urination may develop. Children, older adults and people with other illnesses can become unwell sooner. Most episodes improve, but ongoing symptoms can make eating and drinking difficult and may need clinical assessment.

Use Oral Rehydration Therapy in frequent small sips, particularly after vomiting or diarrhoea. Pause briefly after vomiting, then restart with smaller amounts rather than drinking a large glass at once. Eat simple foods when able and wash hands carefully to reduce spread. A GP Consultation can review hydration, medicines and the need for tests. IV Fluid Therapy may be needed when fluids cannot be kept down or dehydration is significant.

Seek urgent care for confusion, fainting, severe weakness, very little urine, blood in vomit or stool, severe abdominal pain, persistent vomiting or signs of Dehydration. Get prompt advice for a high or ongoing Fever, or when a child, older adult or pregnant person is unable to drink.

Ask how to measure adequate fluid intake, when to use oral rehydration, whether medicines should be paused, and which changes mean you need urgent review. Mention recent travel, sick contacts and any blood in the stool.