When to worry about fever with food poisoning

Fever is a common presentation of Food Poisoning. Infection or toxins affecting the digestive system may also cause diarrhoea, cramps, nausea, vomiting, and loss of appetite. Fever with mild stomach symptoms can improve, but the combination of symptoms and their direction matters.

Food poisoning can cause fluid and salt loss quickly when vomiting or diarrhoea is frequent. Older adults, young children, pregnant people, and those with long-term illness can become dehydrated sooner and should get advice earlier.

Take frequent small sips of water or an oral rehydration drink. If vomiting occurs, pause briefly and restart with smaller sips. Eat bland foods when ready, rest, and avoid alcohol. Wash hands carefully and do not prepare food for others while diarrhoea or vomiting continues.

Record when symptoms began, how often you have vomited or passed stool, and whether you can urinate normally. Use fever medicine only according to the label and check with a clinician if you have kidney disease, stomach ulcers, pregnancy, or regular medicines.

Seek urgent help for fainting, confusion, severe weakness, very little urine, inability to keep fluids down, severe or localised abdominal pain, blood or black stool, or vomit containing blood. Emergency care is needed if the person is difficult to wake or appears seriously unwell.

Contact a clinician promptly if fever is worsening, diarrhoea is persistent, symptoms followed travel or a shared meal, or a vulnerable person is affected. Do not use anti-diarrhoeal medicine without advice when fever or blood in stool is present.

Ask which rehydration drink is suitable, how to monitor urine and dizziness, whether testing or treatment is needed, and when it is safe to return to work or school. Mention travel, pregnancy, chronic illness, and any blood in stool.