What should you know about the most common symptoms of food poisoning?

Food poisoning is illness caused by contaminated food or drink. Symptoms may begin soon after exposure or later, depending on the germ or toxin involved. The illness can cause fluid and salt loss, especially when vomiting and diarrhoea occur together. [Food Poisoning](/conditions/food-poisoning/) gives broader information about causes and recovery.

Symptoms can overlap with stomach viruses, medication effects, and other abdominal conditions. The timing of symptoms, foods shared with others, travel, and the presence of blood or severe pain help a clinician judge what evaluation is needed.

Take frequent small sips of fluid. An [Oral Rehydration Therapy](/treatments/acute-and-urgent-care/oral-rehydration-therapy/) product can replace water and salts more effectively than relying only on plain water when losses are substantial. Rest, eat small amounts as tolerated, and avoid preparing food for others while unwell.

Keep track of urine, dizziness, vomiting, and diarrhoea. Avoid taking leftover antibiotics or medicines intended to stop diarrhoea without advice, because the right choice depends on the suspected cause and your health.

Seek prompt medical advice for blood in stool, severe or localised abdominal pain, persistent vomiting, marked weakness, confusion, fainting, very little urine, or a high or persistent fever. Infants, older adults, pregnant people, and those with significant medical conditions can become dehydrated more quickly. Severe dehydration may require [IV Fluid Therapy](/treatments/acute-and-urgent-care/iv-fluid-therapy/).

Ask how much fluid to take, whether testing is needed, which medicines are suitable, and when you can return to work, school, food preparation, or close contact with others. Mention recent travel, shared meals, and any vulnerable household members.