Feeling sick with a fever can be scary and uncomfortable, especially when it comes from your stomach or digestive system. A fever happens when your body’s temperature rises because it’s fighting off something harmful, like an infection. Sometimes, problems in your stomach or intestines like infections, inflammation, or other digestive issues can trigger a fever.
At Charleston GI, we understand how stressful this can be. Our caring team is here to figure out the cause and provide the right treatment. We help you get relief and feel better so you can return to your daily life with confidence.
A fever with stomach symptoms usually signals gastroenteritis, also known as the “stomach flu.” This happens when the stomach and intestines become inflamed, most often from a viral or bacterial infection.
Viral Infections (Most Common):
Viruses like Norovirus and Rotavirus are the main causes. You can get infected by being around someone who’s sick or by eating or drinking contaminated food or water. Symptoms often include watery diarrhea, vomiting and mild fever.
Bacterial Infections (Usually More Severe):
Bacteria such as Salmonella, E. coli, and Campylobacter can cause food poisoning. These infections usually come from contaminated meat, eggs, or produce and often lead to a higher fever and sometimes bloody diarrhea.
GI CONDITIONS RELATED TO FEVERS
Fevers often happen when the stomach or intestines are inflamed due to infection. Below are common digestive conditions that can cause a high temperature.
Infections (Gastroenteritis)
These are the most common reasons for fever related to the digestive system and are caused by bacteria, viruses, or parasites.
Bacterial Gastroenteritis: Usually causes higher fevers than viral infections. Common bacteria include:
Salmonella (from contaminated meat, eggs, or produce)
Campylobacter (from raw or undercooked poultry)
Shigella (leads to dysentery with bloody stool)
E. coli (certain strains like O157:H7 can cause severe illness)
C. difficile (often appears after antibiotic use)
Viral Gastroenteritis: Also called the “stomach flu,” this can cause a mild fever. Common viruses include:
Norovirus (highly contagious, common in outbreaks)
Rotavirus (mainly affects children; preventable with a vaccine)
Parasitic Infections: Parasites in the GI tract can trigger fever and stomach problems, including:
Giardia lamblia (causes giardiasis)
Entamoeba histolytica (causes amebiasis)
Inflammatory Conditions
Long-term inflammation in the digestive system can cause fever during flare-ups or complications.
Appendicitis: Infection and swelling of the appendix cause sudden fever and pain that starts near the belly button and moves to the lower right side.
Diverticulitis: Infection in small pouches of the colon leads to fever and pain, usually on the left side.
Inflammatory Bowel Disease (IBD): Includes Crohn’s disease and ulcerative colitis. Fever can appear during severe inflammation or if an abscess forms.
Other Serious Conditions
Some serious GI issues also cause fever and need urgent medical care.
Peritonitis: Infection of the lining of the abdomen, often from a ruptured appendix or bowel. This is a medical emergency and almost always causes fever.
Cholecystitis: Inflammation of the gallbladder, often from gallstones, causing upper right abdominal pain and fever.
Hepatitis (Viral Types): Liver infections from Hepatitis A, B, or C can lead to fever and liver inflammation.
If you have a fever with severe stomach pain, bloody diarrhea, or signs of dehydration, seek medical care immediately.
SYMPTOMS
Systemic Symptoms: You may feel feverish (mild or high with bacterial infections), tired, achy, chilled, or have a headache.
Gastrointestinal Symptoms: Common signs include watery diarrhea, nausea, vomiting (sometimes forceful), and stomach pain or cramps.
Dehydration Symptoms: Watch for severe thirst, dry mouth, dark urine, less frequent urination, or feeling dizzy when standing up.
WHEN TO SEE A DOCTOR
Most stomach bugs go away on their own, but some symptoms need quick medical care to prevent serious dehydration or other issues. Seek help right away if you have:
High Fever: A temperature over 102°F (38.9°C).
Bloody Stool or Vomit: Any trace of blood when using the bathroom or vomiting.
Ongoing Vomiting: You can’t keep liquids down for more than 24 hours.
Long-Lasting Diarrhea: Diarrhea that continues for more than three days.
Severe Dehydration: Signs include very little urine, a dry mouth, or confusion.
If you have a chronic illness, are caring for an infant, or are an older adult, contact a healthcare provider as soon as fever or stomach symptoms appear. At Charleston GI, our skilled team of board-certified gastroenterologists will examine, diagnose, and treat your gastrointestinal concerns to provide proper relief.
If your symptoms last or get worse, your doctor will run tests to find the exact cause and make sure you get the right treatment. At Charleston GI, your gastroenterologist usually begins with a basic checkup.
Initial Evaluation: The doctor will examine you and ask about recent travel, diet, and contact with anyone who’s been sick. They’ll also check your pulse and blood pressure to look for signs of dehydration.
Stool Test: This is the primary test used. A stool sample is sent to a lab to identify bacteria, parasites (like Giardia), or viruses (like Norovirus or Rotavirus). This helps determine if the infection is bacterial, viral, or parasitic.
Blood Tests: Blood work may be done to measure electrolytes and kidney function, especially if dehydration or a severe infection is suspected.
FOODS TO AVOID WHEN YOU HAVE A FEVER
There are some things that can make you feel even worse when you’re sick with a fever. We recommend you avoid these things:
Alcohol: It can dry your body and worsen dehydration.
Caffeine: Drinks like coffee or energy drinks can also cause dehydration.
When You’re Not Hungry: Don’t force yourself to eat if you have no appetite—your body can use stored energy for a short time.
Always avoid self-diagnosing and talk to a healthcare professional for proper guidance on diet and recovery.
FOODS & DRINKS SAFE TO HAVE WHEN YOU HAVE A FEVER
To get you back to better health, we recommend you follow these dietary changes to improve your health when you have a fever. These include:
Hydrating Fruits: Eat water-rich fruits like watermelon, oranges, and grapes to replace lost fluids.
Nutritious Meals: Choose light options such as chicken soup, bone broth, or lean meats for easy digestion and essential nutrients.
Simple Starches: If your stomach feels uneasy, go for plain foods like rice, toast, or crackers for quick energy.
Healthy Snacks: Add fruits and vegetables to boost your immune system and keep up your strength.
Water: Drink plenty of water to stay hydrated—it’s the most important.
Broths & Clear Soups: These not only hydrate you but also provide electrolytes your body needs.
Electrolyte Drinks or Coconut Water: These help restore sodium, potassium, and glucose lost through sweating.
Juice or Clear Sodas: Non-diet, clear drinks can also help keep you hydrated.
Always talk to a healthcare professional before making major changes to your diet or care routine.
TREATMENT
Rest: Make sure you get enough sleep so your body can recover.
Stay Hydrated: Drink lots of water, juice, or clear broth to replace lost fluids.
Medication: Use over-the-counter medicine like ibuprofen or acetaminophen to reduce fever, and take anti-nausea medicine if needed.
Antibiotics: Your doctor may prescribe antibiotics if a bacterial infection is the cause.
How can I sleep better when I have a high temperature?
It’s tough to rest with a fever, but you can make it easier by keeping your body cool and comfortable:
Lower the room temperature: Set your thermostat between 60–67°F and use a fan or air conditioner.
Cool your body: Place a damp, cold cloth on your forehead, neck, or wrists.
Stay hydrated: Drink plenty of water, broth, or sports drinks. Skip caffeine and alcohol since they can dry you out.
Take fever medicine: Use ibuprofen or acetaminophen as directed to reduce temperature and body aches.
Dress lightly: Wear loose cotton pajamas and use light bedding.
Add moisture to the air: A humidifier can ease dry throat and help you breathe better.
Keep your head raised: Sleep with extra pillows to ease congestion.
Unwind before bed: Take a warm shower, read, or listen to calming music.
Avoid long naps: Short naps are fine, but too much daytime sleep can make nighttime rest harder.
Call a doctor: Seek medical care if your fever reaches 103°F or higher, lasts more than three days, or comes with confusion, vomiting, or a stiff neck.
Should I eat when I have a high temperature?
Yes, it’s important to eat and drink even if you don’t feel hungry. Your body needs energy to fight infection and fluids to prevent dehydration. Stick to easy-to-digest foods like soup, fruit, or oatmeal, and sip water or electrolyte drinks often.
How do I prevent a high temperature?
To lower your risk of getting sick:
Wash your hands often with soap and warm water.
Avoid close contact with people who are ill.
Cook food thoroughly and handle it safely.
Get regular vaccinations, including a yearly flu shot.
If you feel unwell often, check with a doctor to find the cause and get proper care.
What is a fever?
A fever means your body temperature has risen above normal—usually 100.4°F (38°C) or higher. It’s your body’s way to fight infection. A typical temperature is about 98.6°F (37°C), but it can change slightly throughout the day.
Does my reading change based on where I take my temperature?
Yes, readings differ depending on where you measure:
Rectum, Ear, or Forehead: 100.4°F (38°C) or higher
Mouth: 100°F (37.8°C) or higher
Armpit: 99°F (37.2°C) or higher
How can I tell if my fever is severe?
Doctors often group fevers by how high they are:
Mild: 99.1–100.4°F (37.3–38°C)
Moderate: 100.6–102.2°F (38.1–39°C)
High: 102.4–105.8°F (39.1–41°C)
Very High: Over 105.8°F (41°C)
Call a doctor if:
Infants under 3 months: Fever is 100.4°F (38°C) or more.
Children: Fever lasts over a day (under 2 years) or more than 3 days (over 2 years).
Adults: Fever above 104°F (40°C), lasts over 3 days, or includes confusion, stiff neck, or breathing problems.
What are the types of fever patterns?
Doctors describe five main fever patterns:
Intermittent: Rises and returns to normal each day.
Remittent: Rises and drops but never fully returns to normal.
Continuous (Sustained): Stays high with little change.
Hectic: Shows extreme highs and lows daily.
Relapsing: Disappears for days, then returns.
Why does my fever worsen at night?
Your body’s temperature often rises at night because cortisol levels drop and your immune system becomes more active. As your body fights infection, the brain raises your internal temperature, which can make fevers peak after dark.
How accurate are home thermometers?
Accuracy depends on the type and how it’s used. Digital thermometers for the mouth, ear, or rectum are usually the most reliable. Armpit and strip thermometers are less precise and best for quick checks. For the most accurate results, follow the instructions carefully and avoid eating or drinking right before taking your temperature.
When should I go to the emergency room for a fever?
Go to the ER immediately if:
Your temperature reaches 105°F (40.5°C) or higher.
You have severe symptoms like confusion, shortness of breath, a stiff neck, intense headache, or a seizure.
Adults should also get help for fevers above 103°F (39.4°C) with serious side effects. Babies, young children, and people with weak immune systems may need care sooner.
What does urgent care do for a high temperature?
At urgent care, a doctor will:
Check for the cause with tests like bloodwork or a urine sample.
Prescribe antibiotics (for bacterial infections) or antivirals (for viruses like the flu).
Recommend over-the-counter drugs to reduce fever.
Give IV fluids if you’re dehydrated.
They’ll also explain how to rest, stay hydrated, and care for yourself at home.
SCHEDULE YOUR GI APPOINTMENT TODAY, NO REFERRAL NEEDED
If you have persistent or severe fever and GI issues, let the experts at Charleston GI help you. We are your trusted gastroenterologist team in Charleston, SC. We provide comprehensive diagnosis and management for all gastrointestinal infections and conditions.
If your symptoms are not an emergency but are painful, ongoing, or new, schedule your appointment today. No referral needed.
If you have persistent or severe fever and GI issues, let the experts at Charleston GI help you. We are your trusted gastroenterologist team in Charleston, SC. We provide comprehensive diagnosis and management for all gastrointestinal infections and conditions.
