Causes of chills
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Causes of Chills: Infection, Medical Conditions, Drugs, and Emotional Stimuli
Chills and Acute Infections
Chills are commonly observed during the onset of acute infections. They are often linked to the invasion of the bloodstream by bacteria, which triggers muscle tremors and a sensation of cold. However, the chill does not occur immediately after bacteria enter the blood; it typically appears 30 to 90 minutes later, depending on the type and number of organisms and individual patient factors. This suggests that chills are a response to the body’s reaction to infection rather than the mere presence of bacteria in the blood .
Chills as a Symptom of Serious Medical Conditions
Chills can also be a sign of serious non-infectious medical conditions. For example, acute aortic dissection, a life-threatening cardiovascular emergency, can present with shaking chills even in the absence of typical symptoms like chest or back pain. This highlights the importance of considering a broad range of causes when evaluating a patient with chills .
Drug-Induced Chills
Certain medications can cause chills as a side effect. Amphotericin B, an antifungal drug, is known to induce chills and fever in many patients. This reaction is believed to be mediated by the production of prostaglandin E2, a compound involved in inflammation. The use of ibuprofen, which inhibits prostaglandin synthesis, has been shown to significantly reduce the incidence and severity of chills in patients receiving amphotericin B .
Chills and Emotional or Sensory Stimuli
Chills are not always related to illness or drugs. They can also be triggered by strong emotional or sensory experiences, such as listening to music, viewing powerful images, or even through self-induced mental stimulation. These chills, often referred to as "frisson," are associated with physiological changes like increased skin conductance and heart rate, and can be responses to both positive and negative emotional stimuli .
Chills and Cold Exposure
There is a common belief that exposure to cold or getting a "chill" can cause respiratory infections like the common cold. However, scientific studies have not found a direct link between acute cooling of the body and increased susceptibility to viral infections. Instead, it is suggested that cold exposure may cause reflex vasoconstriction in the nose and airways, potentially reducing respiratory defenses and making existing subclinical infections symptomatic, rather than causing new infections .
Conclusion
Chills can be caused by a variety of factors, including acute infections, serious medical conditions, drug reactions, and strong emotional or sensory experiences. While chills are often associated with infection, they can also signal other underlying issues or simply be a response to intense emotions. Understanding the context and accompanying symptoms is crucial for determining the underlying cause of chills Petersen1927Terada2017Eccles2002+2 MORE.
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