How long does food poisoning last?

Food poisoning is a group of illnesses caused by contaminated food or drink. Nausea, vomiting, diarrhoea, abdominal pain, and fever can appear in different combinations. Some people recover quickly, while others remain tired or have sensitive digestion after the main symptoms ease. The timing can depend on the organism or toxin involved, the amount consumed, and the person’s age and health. Ongoing diarrhoea or vomiting matters because fluid and salts leave the body faster than they can be replaced.

Take frequent small sips of water or an oral rehydration solution, particularly after loose stools or vomiting. Eat small, plain meals when you feel able and rest. Avoid preparing food for other people while you are actively unwell, and wash your hands with soap and water. Oral rehydration therapy may help replace fluid and electrolytes; IV fluid therapy can be considered by clinicians when drinking is not enough.

Seek medical advice if you cannot keep fluids down, pass very little urine, feel faint, become unusually drowsy, or notice blood in stool or vomit. Prompt assessment is also appropriate for severe or localised abdominal pain, a persistent high fever, or symptoms that are worsening rather than easing. Babies, older adults, pregnant people, and anyone with a long-term illness may need earlier advice because dehydration can develop more quickly.

Ask what cause is most consistent with your pattern of symptoms, how much fluid you should aim to drink, and whether you need testing. Tell the clinician when symptoms began, what you ate, whether others are ill, and whether you have passed urine normally.