Chills are a sensation of feeling unusually cold, often accompanied by shivering or involuntary muscle contractions. They can occur even when the surrounding temperature is comfortable or warm. Chills are commonly associ
Chills are a sensation of feeling unusually cold, often accompanied by shivering or involuntary muscle contractions. They can occur even when the surrounding temperature is comfortable or warm. Chills are commonly associated with fever and infections, but they can also happen because of exposure to cold weather, emotional stress, low blood sugar, certain medicines, or other medical conditions.
When chills occur, the muscles rapidly contract and relax to generate heat. This is one of the body's natural mechanisms for maintaining its core temperature. A person may notice shaking of the hands, arms, legs, or the whole body. Chills may last for a few minutes or continue for a longer period depending on their cause.
Chills are often one of the early symptoms of an infection. The immune system can release substances that affect the body's temperature regulation, causing the body to feel cold and triggering shivering. Fever may develop before, during, or after the chills.
Chills do not always mean that a person has a fever. Some people experience chills without a measurable increase in body temperature. The symptoms may occur with tiredness, sweating, headache, muscle aches, nausea, weakness, or other signs depending on the underlying cause.
Occasional chills caused by cold exposure are usually normal. However, unexplained, severe, frequent, or persistent chills should be evaluated by a healthcare professional, particularly when they occur with high fever, breathing difficulties, confusion, severe pain, or other concerning symptoms.
Infections are one of the most common causes of chills. Viral and bacterial infections can trigger the immune system and cause changes in body temperature.
Flu, respiratory infections, urinary tract infections, and other infections may cause chills along with fever, weakness, body aches, headache, cough, or other symptoms.
Chills frequently occur when the body is developing a fever. As the brain's temperature-regulating center raises the body's target temperature, a person may feel cold and begin to shiver.
Chills may continue until the body's temperature reaches the new set point.
Being exposed to cold temperatures can naturally cause shivering. The body contracts muscles rapidly to generate heat and protect the core body temperature.
Chills caused by ordinary cold exposure generally improve after moving to a warm environment and changing into warm, dry clothing.
Low blood glucose can cause shaking, sweating, weakness, dizziness, hunger, confusion, and chills or a cold sensation. This can be particularly important for people with diabetes who use insulin or certain glucose-lowering medicines.
Strong anxiety, fear, panic, or emotional stress can trigger shaking and chills. The body's stress response releases hormones that can cause muscle tension, rapid heartbeat, sweating, and trembling.
Stress-related chills usually improve once the person becomes calmer.
Severe dehydration may affect the body's ability to regulate temperature and can contribute to chills, weakness, dizziness, and fatigue.
Dehydration may occur because of excessive sweating, fever, vomiting, diarrhea, or inadequate fluid intake.
Some medicines can cause chills as a side effect or may influence the body's temperature regulation. Chills can also occur as part of a reaction to certain treatments.
Anyone who develops unexplained chills after starting a medicine should discuss the symptom with a healthcare professional.
Chills can occur with many diseases and medical conditions. The presence of chills alone does not confirm a particular diagnosis.
Influenza commonly causes sudden fever, chills, body aches, headache, cough, sore throat, and significant tiredness. Chills may occur as the body's temperature rises during the infection.
Colds and other respiratory infections can sometimes cause chills, especially when accompanied by fever. Cough, congestion, sore throat, headache, and fatigue may also occur.
A urinary tract infection can cause chills, particularly when the infection becomes more severe. Other symptoms may include painful urination, frequent urination, lower abdominal discomfort, fever, or changes in urine.
Chills with high fever and pain in the side or back may indicate that an infection has reached the kidneys and requires prompt medical attention.
Pneumonia is an infection affecting the lungs and can cause fever, chills, cough, chest discomfort, weakness, and difficulty breathing. Severe pneumonia may require urgent medical treatment.
Malaria is a mosquito-borne infection that can cause episodes of chills, fever, sweating, headache, body aches, and weakness. In areas where malaria occurs or after travel to an affected region, unexplained fever and chills require medical assessment.
Sepsis is a serious reaction to an infection that can cause widespread inflammation and organ dysfunction. Chills may occur together with fever or unusually low body temperature, rapid breathing, rapid heartbeat, confusion, extreme weakness, or reduced alertness.
Sepsis is a medical emergency and requires immediate treatment.
Thyroid conditions can affect the body's temperature regulation. People with an underactive thyroid may be unusually sensitive to cold and may experience a persistent feeling of being cold.
However, isolated chills are more commonly associated with infection or other temporary causes.
Chills can occur alone or alongside other symptoms. Depending on the cause, a person may experience:
The combination of symptoms and their timing can provide important information about the underlying cause.
A person should consult a doctor if chills are persistent, repeatedly occur without an obvious explanation, or are accompanied by symptoms suggesting an infection or another medical condition.
Medical evaluation is particularly important when chills occur with a high or persistent fever, severe weakness, painful urination, persistent cough, chest pain, abdominal pain, or worsening symptoms.
People with weakened immune systems, serious chronic illnesses, or other medical risk factors may require earlier medical assessment when they develop chills and fever.
Seek emergency medical attention if chills occur with:
Chills accompanied by confusion, breathing difficulty, very low or very high body temperature, or severe illness may indicate a serious infection such as sepsis.
Doctors usually ask when the chills started, how long they last, whether there is a fever, and what other symptoms are present. They may ask about recent infections, travel, medications, exposure to cold, food and water, and existing medical conditions.
A physical examination may include checking body temperature, blood pressure, heart rate, breathing rate, and oxygen levels.
Depending on the suspected cause, tests may include blood tests, urine tests, chest imaging, blood glucose testing, or other investigations. If malaria or another infection is suspected, specific diagnostic tests may be required.
Treatment depends on the underlying cause of the chills. If cold exposure is responsible, moving to a warm environment and using appropriate clothing or blankets can help restore normal body temperature.
When infection causes chills, treatment depends on the type and severity of the infection. Viral infections may require rest, fluids, and supportive care, while certain bacterial infections may require prescription treatment.
If low blood sugar is responsible, it needs to be corrected promptly according to appropriate medical guidance. People with diabetes should follow their individual hypoglycemia management plan.
Adequate fluid intake and rest can be helpful when chills occur with fever or dehydration. However, persistent or severe symptoms should not be managed at home without medical evaluation.
Some causes of chills can be reduced by maintaining good hygiene, washing hands regularly, avoiding close contact with people who have contagious infections, staying adequately hydrated, and maintaining a balanced diet.
During cold weather, wearing appropriate warm clothing can help prevent cold-related shivering. People with diabetes can reduce the risk of low blood sugar by following their prescribed meal, medication, and glucose-monitoring plan.
Vaccination against recommended infectious diseases can also help reduce the risk of certain infections that may cause fever and chills.
Chills are episodes of feeling unusually cold, often accompanied by shivering or involuntary muscle contractions. They commonly occur with fever and infections but may also result from cold exposure, low blood sugar, dehydration, anxiety, stress, or certain medicines.
Chills may be associated with illnesses such as influenza, urinary tract infections, pneumonia, malaria, and other infections. In severe cases, chills can occur with serious infections such as sepsis.
Mild chills caused by cold exposure or a temporary illness may improve with warmth, rest, fluids, and recovery. However, persistent or unexplained chills should be evaluated by a healthcare professional, particularly when they occur with fever or other concerning symptoms.
Emergency medical attention is necessary when chills are accompanied by severe confusion, difficulty breathing, chest pain, loss of consciousness, severe weakness, seizures, or signs of a serious infection. Identifying the underlying cause is important so that appropriate treatment can begin and complications can be prevented.
Seek immediate medical attention if chills is severe, sudden, or accompanied by chest pain, difficulty breathing, sudden weakness, loss of consciousness, or severe bleeding.
Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider. In an emergency, call emergency services immediately.