Fever | Symptom Checker
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What causes fever? 221 possible conditions

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

81

Lyme Disease

Lyme disease is an infectious condition transmitted via tick bite. A "bull's eye" rash at the site of the bite is an early symptom of this disease.

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82

Snake Bites

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

A venomous snake bite can be deadly and is a medical emergency. Even a bite from a harmless snake can cause infection or an allergic reaction, producing symptoms like pain and swelling, convulsions, nausea, or paralysis.

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83

Marine Animal Bites or Stings

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

Many marine animals bite or sting. Some deliver venom through their teeth, tentacles, spines, or skin. Others, such as sharks, aren't venomous but can inflict serious bites with their large, sharp teeth. Most creature...

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84

E. coli Infection

E. coli is a type of bacteria normally found in intestines. But certain kinds of E. coli can cause infection and severe symptoms like diarrhea and dehydration.

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85

Hand, Foot, and Mouth Disease

Hand, foot, and mouth disease is a viral infection that's common in children. Learn about symptoms, causes, treatment, and prevention.

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86

Getting a Handle on Aspiration Pneumonia

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

Aspiration pneumonia is an inflammation (usually due to an infection) of your lungs and bronchial tubes that occurs after you inhale foreign matter.

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87

Spinal Cord Abscess

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

Spinal cord abscess (SCA) is a rare condition capable of causing permanent damage to the spinal cord. Abscesses are caused when injured tissue becomes infected. The body's immune system sends white blood cells to hel...

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88

Systemic Gonococcal Infection

Gonorrhea is a sexually transmitted infection. One of its symptoms is a skin rash containing pink and/or red spots that become filled with pus.

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89

Lymphangitis

Lymphangitis is an inflammation of the lymphatic system, which is part of the immune system. It is a network of organs, cells, ducts, and glands.

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90

Infectious (Septic) Arthritis

Infectious arthritis occurs when an infection, caused by a bacteria or virus, spreads to a joint or the fluid surrounding the joint (synovial fluid).

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91

Hernia

A hernia occurs when an organ pushes through an opening in the muscle or tissue that holds it in place. For example, the intestines may break through a weakened area in the abdominal wall. Hernias are most common in th...

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92

Toxic Shock Syndrome

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

Toxic shock syndrome is a rare, serious condition caused by a bacterial infection. Rash is one of several common signs for this symptom.

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93

Herpes Stomatitis

Recurrent herpes simplex labialis, also known as oral or orolabial herpes, is an infection of the mouth area caused by the herpes simplex virus. It is a common and contagious infection that spreads easily.

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94

Mastoiditis

If an infection develops in your middle ear and blocks your Eustachian tube, it may subsequently lead to a serious infection in the mastoid bone.

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95

Addisonian Crisis (Acute Adrenal Crisis)

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

An Addisonian crisis occurs when levels of cortisol suddenly drop. Learn more about an Addisonian crisis, including symptoms, risk factors, and treatment.

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96

Kidney Stones

Kidney stones are solid masses of crystalized calcium or other substances that originate in the kidneys but can pass through the urinary tract. The greatest risk factor is making less than one liter of urine per day.

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97

Rheumatic Fever

Rheumatic fever is a complication of strep throat. If it's left untreated, it can cause permanent damage to your heart. Find out about symptoms and treatment.

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98

Cold Sores

Cold sores are red, fluid-filled blisters that usually form near the mouth. Learn about cold sore causes, symptoms, treatment, and prevention.

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99

Gallstones

Gallstones are hard deposits in the gallbladder that can eventually block the exiting bile ducts. Abdominal pain, fever, itchy skin, and jaundice are symptoms.

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100

Urethritis

Urethritis is a condition in which the urethra, or the tube that carries urine from the bladder to outside the body, becomes inflamed and irritated.

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