diarrhea with fever

Overview

Diarrhea is when you pass loose, watery stools more often than usual. Fever is a raised body temperature. When you have both together, it often means an infection in your digestive system.

Yes, diarrhea with fever is very common. Most people will experience it at some point, often from a stomach bug or food poisoning.

Anyone can get diarrhea with fever, but it is more serious in young children, older adults, and people with weakened immune systems.

Symptoms

Common symptoms

• Loose, watery stools
• Cramps or pain in the belly
• Nausea or vomiting
• Feeling hot or chilly
• Feeling tired or weak

Symptoms in children

• Dry mouth or tongue
• Fewer wet nappies than usual (less than 4 in 24 hours)
• No tears when crying
• Sunken eyes or cheeks
• Unusually sleepy or irritable

Symptoms in older adults

• Weakness or dizziness
• Confusion or trouble thinking clearly
• Dark urine (a sign of dehydration)
• Low blood pressure

Causes

Main causes

• Viral infections (like norovirus or rotavirus) – the most common cause
• Bacterial infections (like from contaminated food or water, e.g., Salmonella, Campylobacter)
• Parasitic infections (like Giardia) – more common after travel to certain areas
• Food poisoning from eating spoiled or undercooked food

Risk factors

• Travel to areas with poor sanitation
• Eating undercooked meat, raw seafood, or unpasteurized dairy
• Touching contaminated surfaces and then your mouth
• Having a weakened immune system (e.g., from chemotherapy or chronic illness)
• Being very young or very old

When to see a doctor

See a doctor urgently if:

• You or your child show any emergency symptoms listed above.
• You have a serious underlying health condition (like diabetes, kidney disease, or a weakened immune system) and develop diarrhea with fever.
• You see blood in your stool.

Book a routine appointment if:

• Diarrhea with fever that lasts longer than 3–5 days without getting better.
• You are not able to drink enough fluids to stay hydrated.
• You have recently travelled abroad or been in the hospital.

Diagnosis

A doctor will ask about your symptoms, diet, recent travel, and any medications you take. They will check your temperature and may gently press on your belly to find the source of pain.

Tests that may be done

• Stool test – to check for bacteria, parasites, or blood
• Blood test – to check for signs of infection or dehydration
• Sometimes a urine test to check hydration levels

What to expect at your appointment

The doctor will want to know when your symptoms started, how often you have diarrhea, what the stool looks like, and whether anyone else in your home is sick. Based on that, they will decide if you need treatment or just home care.

Treatment

Treatment focuses on preventing dehydration and treating the underlying cause if needed. Most infections get better on their own without medicine.

Self-care at home

• Drink plenty of clear fluids like water, clear broth, or an oral rehydration solution (available at pharmacies).
• Rest as much as possible to help your body fight the infection.
• Eat small, bland meals – like plain rice, toast, bananas, or crackers – when you feel able.
• Avoid dairy, fatty or greasy foods, sugary drinks, and alcohol until you are better.

Medical treatments

If a bacterial infection is found, your doctor may prescribe antibiotics. For some parasitic infections, antiparasitic drugs are used. Anti-diarrheal medicines are not usually recommended because they can slow the elimination of the infection – only take them if your doctor says it is safe for your specific situation.

When is surgery considered?

Surgery is almost never needed for diarrhea with fever. In rare cases, a severe infection can cause appendicitis or a tear in the bowel that requires surgery, but this is very unusual.

Living with this condition

While you are sick, stay home from work or school to rest and avoid spreading the infection. Keep washing your hands frequently, especially after using the toilet and before eating.

Lifestyle tips

• Wash your hands with soap and water after every bathroom visit.
• Use separate towels and utensils from others until you are well.
• Disinfect shared surfaces like toilet handles and door handles.

Diet and exercise

Stick to a bland, easy-to-digest diet until your stool becomes firm. Avoid heavy exercise while you have a fever – gentle walks are okay when you feel up to it.

Mental health and emotional wellbeing

It is normal to feel frustrated or anxious when you are stuck at home with diarrhea and fever. Remember that this is temporary and most people recover fully within a few days.

Prevention

You can reduce your risk by practising good hygiene, especially handwashing, and being careful with food and water, especially when travelling.

Vaccines

Vaccines are available for rotavirus (given to babies) and for cholera (for travel to high-risk areas). There is no vaccine for most other causes of infectious diarrhea.

Screening programmes

There is no routine screening for diarrhea with fever. If you develop symptoms after travel, your doctor may recommend a stool test.

Complications

If left untreated

• Dehydration – when your body loses more fluid than you drink, which can be dangerous, especially for children and older adults.
• Electrolyte imbalance – loss of salts like sodium and potassium, which can affect your heart and muscles.
• Kidney problems – from severe dehydration or from a bad infection.
• Hospitalisation – needed if dehydration cannot be managed at home.

Long-term outlook

The outlook is excellent. Most people recover fully within a few days to a week without any long-term problems. With proper fluid intake and rest, your body can usually fight off the infection on its own.

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