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Have a fever
Joint pain that is always there
Both hips hurt
Loss of appetite
Poor feeding
Fatigued
Have joint pain
Not seeing your symptoms? No worries!
An infection caused by the influenza virus, typically affecting the respiratory tract (nose, windpipe, lungs).
Your doctor may ask these questions to check for this disease:
Antiviral medications for the flu can lessen symptom severity and promote quicker recovery. To be effective, these flu antiviral medications should be taken within the first 48 hours of illness.
Reviewed By:
Phillip Aguila, MD, MBA (Pulmonology, Critical Care)
Dr. Aguila graduated from West Virginia University School of Medicine. He has trained in Pulmonary and Critical Care Medicine at The University of North Carolina in Chapel Hill and Internal Medicine at Medical College of Pennsylvania/Hahnemann University at Allegheny General Hospital in Pittsburgh Pennsylvania. He has served as Assistant Professor since 2010.
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.
Content updated on Apr 4, 2024
Following the Medical Content Editorial Policy
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With a free 3-min Influenza (Flu) 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.
Your symptoms

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Your report

Your personal report will tell you
✔ When to see a doctor
✔︎ What causes your symptoms
✔︎ Treatment information etc.
See full list
Male, Teens
Ubie confirmed the severity of my health problems. It pushed me to actually contact a doctor, instead of staying at home & suffering. My primary care provider told me I had the flu and prescribed medicines.
(Feb 20, 2025)
Q.
Flu A vs Flu B? Why Your Body Aches & Medically Approved Next Steps
A.
Flu A is more common and drives larger outbreaks, while Flu B infects only humans and can be just as serious, especially in children; symptoms overlap and you cannot tell the type without testing, and those deep body aches come from immune cytokines and fever driven, whole body inflammation. Medically approved next steps include starting antivirals within 48 hours, true rest, aggressive hydration, safe fever and pain control, close monitoring for red flags, early care for high risk groups, and vaccination to reduce severe illness from both. There are several factors to consider. See below to understand more.
References:
* Wang K, et al. Clinical Differences Between Influenza A and B: A Systematic Review and Meta-Analysis. Clin Infect Dis. 2017 Mar 1;64(5):610-619. doi: 10.1093/cid/ciw845. Epub 2016 Dec 9. PMID: 28329241.
* Mayer-Lambertz S, et al. The Immunopathogenesis of Human Influenza A Virus Infection. Front Immunol. 2021 Mar 15;12:656209. doi: 10.3389/fimmu.2021.656209. PMID: 33790890; PMCID: PMC8003610.
* Han J, et al. Clinical and Virological Characteristics of Patients Infected with Influenza A and B Viruses. PLoS One. 2016 Feb 26;11(2):e0150242. doi: 10.1371/journal.pone.0150242. PMID: 26919293; PMCID: PMC4769064.
* Uyeki TM, et al. Antiviral Drugs for the Treatment and Prevention of Seasonal Influenza: A Clinical Practice Guideline from the Infectious Diseases Society of America. Clin Infect Dis. 2019 Dec 13;69(10):e1-e48. doi: 10.1093/cid/ciz462. PMID: 30919010.
* He J, et al. Influenza Viruses: An Overview. Semin Respir Crit Care Med. 2021 Apr;42(2):159-173. doi: 10.1055/s-0040-1718873. Epub 2021 Mar 22. PMID: 33827103.
Our symptom checker AI is continuously refined with input from experienced physicians, empowering them to make more accurate diagnoses.

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Which is the best Symptom Checker?
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/10.1101/2024.08.29.24312810v1Webster RG, Govorkova EA. Continuing challenges in influenza. Ann N Y Acad Sci. 2014 Sep;1323(1):115-39. doi: 10.1111/nyas.12462. Epub 2014 May 30. PMID: 24891213; PMCID: PMC4159436.
https://onlinelibrary.wiley.com/doi/10.1111/nyas.12462Gaitonde DY, Moore FC, Morgan MK. Influenza: Diagnosis and Treatment. Am Fam Physician. 2019 Dec 15;100(12):751-758. PMID: 31845781.
https://www.aafp.org/pubs/afp/issues/2019/1215/p751.htmlLabella AM, Merel SE. Influenza. Med Clin North Am. 2013 Jul;97(4):621-45, x. doi: 10.1016/j.mcna.2013.03.001. PMID: 23809717.
https://www.sciencedirect.com/science/article/abs/pii/S0025712513000424?via%3DihubKeilman LJ. Seasonal Influenza (Flu). Nurs Clin North Am. 2019 Jun;54(2):227-243. doi: 10.1016/j.cnur.2019.02.009. PMID: 31027663.
https://www.sciencedirect.com/science/article/abs/pii/S002964651930009X?via%3DihubKumar V. Influenza in Children. Indian J Pediatr. 2017 Feb;84(2):139-143. doi: 10.1007/s12098-016-2232-x. Epub 2016 Sep 19. PMID: 27641976.
https://link.springer.com/article/10.1007/s12098-016-2232-x