Looking to lead a stronger, healthier life?
Sign up for our Wellness Wire newsletter for all sorts of nutrition, fitness, and wellness wisdom.

Now we’re in this together.
Thanks for subscribing and having us along on your health and wellness journey.

See all Healthline's newsletters »
Advertisement
Let's see if we can figure out what's causing your fever.
Select additional symptoms and we'll narrow your results.

What causes fever? 221 possible conditions

See a list of possible causes in order from the most common to the least.

21

Appendicitis

This condition is considered a medical emergency. Urgent care may be required.

Appendicitis is inflammation of the appendix. Here's what it feels like, what causes it, and what tests to expect at your doctor's office.

Read more »

22

Swine Flu

Swine flu, or H1N1, is highly contagious and can spread quickly from person to person. A simple sneeze may cause thousands of germs to spread through the air. Symptoms are similar to regular influenza.

Read more »

23

Tonsillitis

Tonsillitis can occur at any age and is a common childhood ailment. It is most often diagnosed in children from preschool age through their midteens.

Read more »

24

Viral Gastroenteritis

Viral gastroenteritis, also known as the stomach flu, is caused by a number of different viruses. Its symptoms usually last for two to three days.

Read more »

25

Infectious Mononucleosis

Infectious mononucleosis, or mono, refers to a group of symptoms usually caused by the Epstein-Barr virus (EBV).

Read more »

26

Pyelonephritis

Pyelonephritis is an inflammation of the kidney and upper urinary tract. Symptoms include flushed skin, back pain, fever, and nausea.

Read more »

27

The Atypical Facts About Atypical Pneumonia

Are your cold symptoms lasting longer than a week? Do you have walking pneumonia? Learn how to treat and prevent this condition.

Read more »

28

Pharyngitis

Pharyngitis is inflammation of the pharynx, which is in the back of the throat. It's most often referred to simply as "sore throat" and is very common.

Read more »

29

Chickenpox

Also known as varicella, chickenpox is a virus that often affects children. It is characterized by itchy, red blisters that appear all over the body.

Read more »

30

Cellulitis

Cellulitis is a common bacterial skin infection. Cellulitis may first appear as a red, swollen area that feels hot and tender to the touch.

Read more »

31

Epiglottitis

This condition is considered a medical emergency. Urgent care may be required.

Epiglottitis is characterized by inflamed tissue in your epiglottis. It's a potentially life-threatening condition. Learn who gets it, why, and how it's treated.

Read more »

32

Measles

Measles is a very contagious infection of the respiratory system. One of its several symptoms is a sore or swollen throat.

Read more »

33

The Many Sides of Bacterial Gastroenteritis

Bacterial infections are common causes of gastrointestinal infections. This type of infection is also called "food poisoning" and is often caused by poor hygiene or ingesting foods contaminated with bacteria.

Read more »

34

Crohn’s Disease

Crohn's disease is a chronic bowel disease that causes severe inflammation of the digestive tract. It is associated with abdominal pain, diarrhea, and may affect your quality of life. Crohn's disease is characterized b...

Read more »

35

Pelvic Inflammatory Disease (PID)

Pelvic inflammatory disease (PID) is an infection of the reproductive organs in women. It's marked by pain in the abdomen, especially during urination or sex.

Read more »

36

Fifth Disease

Fifth disease is common in children. It causes a red rash on the arms, legs, and cheeks, and a virus called parvovirus B19 causes it.

Read more »

37

German Measles (Rubella)

German measles, also known as rubella, is a viral infection. Learn about German measles symptoms, causes, diagnosis, treatment, and prevention.

Read more »

38

Empyema

An empyema is a condition in which pus collects in the pleural space, which is the area between your lungs and the inner surface of your chest wall.

Read more »

39

Rhinitis

Rhinitis is inflammation of your nasal cavity lining. It can be allergic or nonallergic. It also may be infectious.

Allergic rhinitis can occur when you breathe in something that you're allergic to, known a...

Read more »

40

CFS (Chronic Fatigue Syndrome)

Chronic fatigue syndrome (CFS) is a debilitating disorder characterized by extreme tiredness that can't be explained by an underlying medical condition.

Read more »

This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
Advertisement
Advertisement
Advertisement