Chills, Fatigue, Headache, Rash: 6 Possible Causes
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What is causing your symptoms? 6 possible conditions

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


Infectious Mononucleosis

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

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Leukemia is a cancer of the blood cells. There are several types of blood cells, including red blood cells (RBCs), white blood cells (WBCs), and platelets. Generally, leukemia refers to cancers of the WBCs. Two types o...

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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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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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Colorado Tick Fever

Colorado tick fever is a viral infection transmitted through a bite from an infected tick. Learn about Colorado tick fever symptoms, diagnosis, and treatment.

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Transfusion Reactions

A transfusion reaction is when your body has an adverse response to a blood transfusion. Learn how transfusion reactions occur and how to minimize your risk.

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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.