Influenza-like symptoms

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Alberto Plate [2]

Overview

Influenza-like illness (ILI), also known as acute respiratory infection (ARI) andflu-like syndrome/symptoms, is a medical diagnosis of possible influenza or other illness causing a set of common symptoms. Here, SARI refers to Severe Acute Respiratory Infection. Symptoms commonly include fever, shivering, chills, malaise, dry cough, loss of appetite, body aches and nausea, typically in connection with a sudden onset of illness. In most cases, the symptoms are caused by cytokines released by immune system activation and are thus relatively non-specific.

Definition

WHO[1]:

  • Measured fever of ≥ 38 C°
  • Cough;
  • Onset within the last 10 days.

CDC[2]:

  • Temperature of 100°F [37.8°C] or greater)
  • Cough and/or a sore throat
  • Without a known cause other than influenza

Causes

Common causes of ILI include the common cold and influenza, which tends to be less common but more severe than the common cold. Still less common causes include side effects of many drugs and manifestations of many other diseases.

Causes by Organ System

Cardiovascular No underlying causes
Chemical/Poisoning No underlying causes
Dental No underlying causes
Dermatologic No underlying causes
Drug Side Effect Histrelin, Interferon gamma, Loratadine, Ribavirin, Sorafenib
Ear Nose Throat No underlying causes
Endocrine No underlying causes
Environmental No underlying causes
Gastroenterologic No underlying causes
Genetic No underlying causes
Hematologic No underlying causes
Iatrogenic No underlying causes
Infectious Disease No underlying causes
Musculoskeletal/Orthopedic No underlying causes
Neurologic No underlying causes
Nutritional/Metabolic No underlying causes
Obstetric/Gynecologic No underlying causes
Oncologic No underlying causes
Ophthalmologic No underlying causes
Overdose/Toxicity No underlying causes
Psychiatric No underlying causes
Pulmonary No underlying causes
Renal/Electrolyte No underlying causes
Rheumatology/Immunology/Allergy No underlying causes
Sexual No underlying causes
Trauma No underlying causes
Urologic No underlying causes
Miscellaneous No underlying causes

Causes by alphabetical order

References