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.

Stingrays have venomous spines on their tails that can cause a painful wound, nausea, and weakness, and sometimes death. Swimming or snorkeling in shallow waters puts you at risk for coming in contact.

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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 contagious condition that usually affects young children. It presents as a rash on the hands and feet along with blisters in the mouth.

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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 of your lungs and bronchial tubes that happens after foreign matter is inhaled. Symptoms include chest pain, wheezing, and blue discoloration of the skin.

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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 inflammation (swelling) of the lymphatic system, which is a major part of the immune system. The lymphatic system consists of a network of organs, cells, ducts, and glands or "nodes" which can be foun...

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90

Infectious (Septic) Arthritis

Infectious arthritis occurs when an infection that usually begins in another area of the body due to surgery, open wounds, or injections 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 the muscle or tissue that holds it in place. Hernias are most common in the abdomen. However, they can also appear in the upper thigh, belly button, and groin regions.

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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

One of the most important structures in your inner ear is the mastoid bone. Although it's called a bone, the mastoid does not have the typical structure associated with bones in the human body. Rather than being soli...

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95

Addisonian Crisis (Acute Adrenal Crisis)

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

People with Addison's disease don't make enough cortisol or aldosterone. Addisonian crisis is a potentially life-threatening condition indicated by nausea, abdominal pain, fever, and chills.

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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 possible and potentially serious complication of strep throat. It tends to occur in children between five and 15 years old. Rash is one possible sign of this condition.

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98

Cold Sores

Cold sores are red, fluid-filled blisters that appear most often near the mouth. They have no cure, are contagious, and may reoccur without warning.

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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 possible symptoms.

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100

Urethritis

Urethritis is an infection of the urethra, the tube that carries urine from the bladder and semen out of the body. Symptoms include burning while urinating, abdominal pain, and discharge.

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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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