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  1. Symptom Checker with Body from WebMD - Check Your Medical …

  2. Illness Definition & Meaning - Merriam-Webster

  3. Infectious diseases - Symptoms & causes - Mayo Clinic

  4. Mental illness - Symptoms and causes - Mayo Clinic

  5. Viral Infection: Causes, Symptoms, Tests & Treatment - Cleveland Clinic

  6. Coronavirus disease 2019 (COVID-19) - Symptoms and causes

  7. What Is a Chronic Illness? - Healthline

  8. Symptoms of COVID-19 | CDC

  9. Protect yourself from COVID-19, Flu, and RSV

  10. Disease - Wikipedia