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Sickness Definition & Meaning - Merriam-Webster
Coronavirus disease 2019 (COVID-19) - Symptoms and causes
Common Illnesses - University Health Services
Food poisoning - Symptoms and causes - Mayo Clinic
Nausea and vomiting Causes - Mayo Clinic
Why do I keep getting sick? Causes and what to do - Medical News Today
Sickness - Definition, Meaning & Synonyms - Vocabulary.com
Feeling sick (nausea) - NHS
Motion Sickness: What It Is, Causes, Symptoms & Treatment
Sickness | definition of sickness by Medical dictionary