Chills: what it usually means
Also searched as: shivering, feeling cold without fever, body chills, shaking chills · Updated 19 Aug 2026 · Educational — not medical advice
The short answer: Chills, a sensation of cold with shivering, most often accompany a fever as the body raises its internal temperature to fight an infection. They can also occur with cold exposure or low blood sugar. Chills with a very high fever, confusion, rapid breathing, or repeated shaking episodes need prompt medical evaluation to rule out a serious infection.
See a doctor promptly if…
Chills with a very high fever, confusion, or difficulty breathing need emergency evaluation.
Repeated shaking chills with fever, especially with back pain, may indicate a spreading infection and warrant urgent care.
Chills lasting more than a couple of days without an obvious cause deserve medical review.
Chills in someone with a weakened immune system or chronic illness should be assessed promptly.
Common causes
- Viral or bacterial infection — The body raises its temperature to fight infection, often triggering chills before a fever is noticeable.
- Cold exposure — Prolonged exposure to cold temperatures or wet clothing can cause shivering chills.
- Low blood sugar — A sudden drop in blood glucose can cause shakiness and a chilled sensation.
- Urinary or kidney infection — Infections that spread to the kidneys often cause chills alongside back pain and fever.
- Flu-like illness — Viral infections commonly cause chills, body aches, and fatigue together.
- Medication reaction — Certain medicines or treatments can trigger chills as a side effect.
What helps
- Rest and dress in layers to stay comfortably warm without overheating.
- Stay well hydrated and monitor temperature regularly if chills accompany a fever.
- Eat something if low blood sugar might be the cause, especially if you have diabetes.
- Track how long chills last and any other symptoms to share with a doctor.
Which doctor to consult
Start with your family doctor to identify the underlying cause; seek emergency care if chills come with a very high fever, confusion, or breathing difficulty.
Lab tests doctors often check
If this symptom persists, these are the values a doctor commonly looks at — and if you already have a report, the analyzer explains where you stand.
Questions people ask
Why do I get chills before a fever spikes?
The body raises its internal temperature set point to help fight infection, and shivering is how it generates extra heat to reach that new target quickly. This is why chills often come right before you notice the fever itself.
Can chills happen without a fever?
Yes, cold exposure, low blood sugar, and even anxiety can cause shivering and a chilled feeling without any fever present. If chills happen repeatedly without fever, it's worth checking blood sugar and discussing the pattern with a doctor.
When are chills a medical emergency?
Chills paired with a very high fever, confusion, rapid breathing, or repeated shaking episodes should be treated urgently, since these can signal a serious spreading infection. Seek emergency care rather than waiting for symptoms to improve on their own.
Related symptoms
This guide is educational and doesn't replace a clinical assessment. If a symptom is severe, rapidly worsening, or worrying you, see a doctor — being checked and reassured is never a wasted visit.