Experiencing chills while preparing for a colonoscopy is a common side effect that many patients encounter. The preparation, or “prep,” involves consuming a large volume of laxative solution to clear the colon. This process leads to rapid and frequent bowel movements, which is necessary for a successful procedure. While the sensation of being cold can be uncomfortable, it is typically a normal response to the changes happening within your body during this cleansing phase. Understanding the underlying reasons for this temperature change can help alleviate anxiety.
Understanding the Causes of Chills During Preparation
The feeling of being cold or having mild shivers during the prep is primarily a physiological reaction to three distinct factors. The first is the sheer volume and often cold temperature of the solution itself. Many people are instructed to chill the laxative solution to make it more palatable, and rapidly consuming this cold liquid can decrease your core body temperature slightly. This decrease triggers a temporary shivering response as your body tries to warm up.
A more significant factor is the rapid loss of fluid and electrolytes caused by the osmotic laxatives. These solutions work by drawing large amounts of water into the colon, leading to profuse, watery diarrhea. This rapid and substantial fluid loss can quickly lead to a mild state of dehydration, which disrupts the body’s internal thermostat, making you feel cold.
The intense process of bowel cleansing, coupled with the stress of the impending procedure, can activate the sympathetic nervous system. This “fight or flight” response can sometimes lead to mild tremors or shivering. This is simply the body reacting to the physical and emotional strain of the preparation.
Immediate Steps for Managing Temperature Discomfort
Since mild chills are an expected side effect, there are several simple and immediate steps you can take to manage this temperature discomfort at home. One of the easiest solutions is to manage your immediate environment by using layers of clothing and blankets. Wearing warm socks and a robe while staying near your bathroom can help maintain your body heat despite the internal cooling.
If you are using a large-volume prep solution, consider the temperature at which you are consuming it. While chilling the solution improves the taste for many, keeping it slightly cooler than room temperature, rather than ice-cold, may reduce the immediate chilling effect on your body. Always follow the specific temperature instructions provided by your physician.
To counteract the internal cooling from fluid loss, consuming warm, clear liquids is highly beneficial. Clear broth, ginger ale, or herbal tea (avoiding red, purple, or orange colors) can provide warmth and help replace lost fluids and electrolytes. For long periods in the bathroom, a small space heater directed toward you can be very effective in maintaining a comfortable temperature.
Recognizing When Chills Require Medical Attention
While mild, transient chills are normal, it is important to distinguish them from symptoms that signal a more serious medical issue. The most concerning sign is when chills are accompanied by a true fever, defined as a temperature of 101°F (38.3°C) or higher. A fever with shaking chills could indicate an infection, which requires immediate medical evaluation.
You should contact your physician or seek urgent care if the chills are accompanied by signs of severe dehydration or electrolyte imbalance. These symptoms include persistent vomiting, severe dizziness, fainting, confusion, or a significant decrease in urination. Severe abdominal pain that does not resolve after a bowel movement is another red flag that warrants medical attention.
If you experience chest pain, an irregular heartbeat, or severe weakness, these could indicate a serious electrolyte disturbance caused by the rapid fluid loss. It is always safer to pause the prep and contact your healthcare provider immediately if you are worried about any symptom that feels outside the range of expected discomfort.