Fever
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Try one of these related symptoms.
Have a fever
My body is hot
Recurrent fevers
Periodic fever (>100.4°F / 38°C)
Fever then no fever then fever again
Remittent fever of 102.2°F / 39°C
Extremely high fever of 106.7°F / 41.5°C or higher
Fever of 100.4°F / 38°C or more for weeks
Stomach was uncomfortable, then had a fever
Stomachache and diarrhea before a fever
Temperature of 102.2°F / 39°C goes up and down
About the Symptom
A fever is a rise in body temperature.
When to See a Doctor
Seek professional care if you experience any of the following symptoms
- Repeated fever above 38 ℃
- Difficulty breathing / breathlessness
- Gross hematuria
- Peripheral cyanosis
- Sensation of incomplete voiding
- Respiratory wheeze
- Seizure attack
Possible Causes
Generally, Fever can be related to:
- Adult Still's Disease
A rare systemic inflammatory disease characterized by high fevers, a pink rash, sore throat and body aches that persist for weeks. The exact cause is unknown but is thought to be triggered by an infection. Some patients will have only one episode of it, while others may have several recurrent episodes.
- Acute Disseminated Encephalomyelitis
Acute disseminated encephalomyelitis involves widespread inflammation of the brain and spinal cord, resulting in damage to nerve fibers and their protective linings. It is a result of inflammation that occurs after after an infection or immunization. While it can affect anyone it is more common in children.
- Rabies
Rabies is a deadly viral disease that can spread to people and animals through bites or scratches from infected animals. It is commonly found in wild animals like stray dogs, bats, raccoons, skunks, and foxes. The rabies virus travels through nerve cells to the brain, where it multiplies quickly, causing severe inflammation of the brain and spinal cord, often leading to death.
- Suppurative Lymphadenitis
Related Serious Diseases
Sometimes, Fever may be related to these serious diseases:
- Spinal Cord Abscess
A buildup of pus around the spinal cord can compress nerves and cause symptoms. This sometimes occurs when bacteria from nearby wounds invade, or when bacteria multiply in distant areas and travel through the bloodstream to the spinal cord's surface.
- Peritonitis
- Empyema
- Malaria
- Measles
- Viral Associated Hemophagocytic Syndrome
Doctor's Diagnostic Questions
Your doctor may ask these questions to check for this symptom:
- Do you have a fever?
- When did you first notice the fever?
- During your fever, what is your highest body temperature?
- How is your fever now?
- Do you have recurrent fever episodes?
Reviewed By:
Yoshinori Abe, MD (Internal Medicine)
Dr. Abe graduated from The University of Tokyo School of Medicine in 2015. He completed his residency at the Tokyo Metropolitan Health and Longevity Medical Center. He co-founded Ubie, Inc. in May 2017, where he currently serves as CEO & product owner at Ubie. Since December 2019, he has been a member of the Special Committee for Activation of Research in Emergency AI of the Japanese Association for Acute Medicine. | | Dr. Abe has been elected in the 2020 Forbes 30 Under 30 Asia Healthcare & Science category.
Unnati Patel, MD, MSc (Family Medicine)
Dr.Patel serves as Center Medical Director and a Primary Care Physician at Oak Street Health in Arizona. She graduated from the Zhejiang University School of Medicine prior to working in clinical research focused on preventive medicine at the University of Illinois and the University of Nevada. Dr. Patel earned her MSc in Global Health from Georgetown University, during which she worked with the WHO in Sierra Leone and Save the Children in Washington, D.C. She went on to complete her Family Medicine residency in Chicago at Norwegian American Hospital before completing a fellowship in Leadership in Value-based Care in conjunction with the Northwestern University Kellogg School of Management, where she earned her MBA. Dr. Patel’s interests include health tech and teaching medical students and she currently serves as Clinical Associate Professor at the University of Arizona School of Medicine.
Content updated on Jan 29, 2025
Following the Medical Content Editorial Policy
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With a free 3-min Fever quiz, powered by Ubie's AI and doctors, find possible causes of your symptoms.
This questionnaire is customized to your situation and symptoms, including the following personal information:
Biological Sex - helps us provide relevant suggestions for male vs. female conditions.
Age - adjusts our guidance based on any age-related health factors.
History - considers past illnesses, surgeries, family history, and lifestyle choices.
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People with similar symptoms also use Ubie's symptom checker to find possible causes
- Has over 100.4°F / 38°C heat
- Persistently having fever of 102.2°F / 39°C for a whole day and it spikes even higher once in a while
- Fever subsided to normal temperatures for a while but came back again
- Persistent fever of 100.4°F / 38°C or more for more than 7 days
- Baby has a fever but is otherwise healthy and energetic
- Fever is going too high, 106.7°F / 41.5°C or higher
- Keep getting high temperatures (>100.4°F / 38°C)
- Coughing and runny nose before the fever started
- There is a slight fever
- Fever of 102.2°F / 39°C goes up and down but it doesn't disappear
- Recovered from fever for a few days but the fever is back
- Continuous fever of 100.4°F / 38°C or more for a week
- Child has a fever but seems in good health still
- Get high fevers so often (>100.4°F / 38°C)
- High body temperature
See full list
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FAQs
Q.
Is It Just a Virus? Why You’re Still Sick & Medically Approved Next Steps
A.
Still feeling sick after a virus can be normal recovery, a secondary bacterial infection, a different condition, or an overactive immune response. There are several factors to consider, and the details below outline symptom timelines, red flags, and what each pattern means. Medically approved next steps include rest, hydration, tracking symptoms, appropriate testing and OTC relief, and contacting a clinician if symptoms worsen, last beyond 10 to 14 days, or if urgent signs like trouble breathing, chest pain, or very high fever appear. See below for specific decision points that could change your next step.
References:
* Nalbandian A, et al. Pathophysiology of long COVID: a review. eClinicalMedicine. 2022 Apr;46:101399. doi: 10.1016/j.eclinm.2022.101399. Epub 2022 Apr 14. PMID: 35434685.
* Maizels M, et al. Post-viral fatigue syndrome: an update. Curr Opin Infect Dis. 2023 Aug 1;36(4):307-313. doi: 10.1097/QCO.0000000000000918. Epub 2023 Jun 27. PMID: 37375679.
* Di Gennaro G, et al. Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Diagnostic Approaches and Therapeutic Strategies. Biomedicines. 2023 May 13;11(5):1413. doi: 10.3390/biomedicines11051413. PMID: 37190035.
* Sneller MC, et al. Immune Dysregulation in Post-Acute Sequelae of SARS-CoV-2 Infection (PASC). Int J Mol Sci. 2023 Feb 7;24(4):3139. doi: 10.3390/ijms24043139. PMID: 36768782.
* Veras MM, et al. Management of post-acute COVID-19 syndrome: a systematic review and meta-analysis of current evidence. J Clin Med. 2023 May 20;12(10):3591. doi: 10.3390/jcm12103591. PMID: 37240368.
Q.
Scared of Reglan? Why Your Body Is Reacting & Medically Approved Next Steps
A.
Reglan speeds stomach emptying by blocking dopamine receptors, so mild effects like drowsiness, restlessness, or sleep trouble are common, while more serious movement or mood changes, including tardive dyskinesia, are rarer and more likely with higher doses or longer use. Do not stop it on your own; contact your prescriber about side effects, seek urgent care for abnormal movements, fever with stiffness, or severe confusion, and ask about dose changes or alternatives. There are several factors to consider; see below for who is at higher risk, the exact red flags to watch for, and medically approved next steps tailored to your situation.
References:
* Al-Hashel JY, Al-Khaled M. Metoclopramide: A review of its risks and benefits. Drugs Context. 2023 Feb 27;12:2022-10-1. PMID: 36873550.
* Singh A, Ramalakshmi T, Thulasingam M, Karthikeyan C, Palanisamy S. Metoclopramide-induced extrapyramidal symptoms: a systematic review and meta-analysis. Neurol Sci. 2023 May;44(5):1749-1760. PMID: 36592237.
* Vella V, Vella R, De Ritis R, Di Mauro G. Metoclopramide-induced akathisia and its management: a review. Expert Opin Drug Saf. 2018 Jul;17(7):657-664. PMID: 29750711.
* Padda IS, Padda A, Khurana S, Padda M, Anjum B, Kotecha A, Maqsood R, Patel K, Khawar H, Khalid A. Metoclopramide discontinuation syndrome: an updated review. Front Pharmacol. 2023 May 17;14:1175654. PMID: 37265844.
* Camilleri M, Chedid V, Ford AC, Jones KL, Liu N. Gastroparesis: current and emerging therapeutic approaches. Lancet Gastroenterol Hepatol. 2022 Sep;7(9):856-867. PMID: 35843236.
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Ubie’s symptom checker demonstrated a Top-10 hit accuracy of 71.6%, surpassing the performance of several leading symptom checkers in the market, which averaged around 60% accuracy in similar assessments.
Link to full study:
https://www.medrxiv.org/content/10.1101/2024.08.29.24312810v1References
High temperature (fever) in adults
https://www.nhs.uk/conditions/fever-in-adults/