Nov 23, 2022 · Common viral illnesses include colds, the flu, COVID-19, norovirus (“stomach flu”), HPV (warts) and herpes simplex virus (cold sores). Many viruses go away on their own, but some cause …

Know the symptoms: Cold, flu, RSV, or COVID-19 The common cold, the flu, RSV, and COVID-19 are viral respiratory infections that spread easily during certain seasons. These illnesses have many …

Oct 20, 2025 · Viral infections occur when viruses invade your cells, and they can spread through contact with infected people or surfaces. Your symptoms depend on the affected body part and can …

Aug 26, 2024 · Flu symptoms usually come on suddenly. People who have flu often feel some or all of these signs and symptoms: some people may have vomiting and diarrhea, though this is more …

Symptoms depend on the virus but may include fever, cough, fatigue or sore throat. Viruses spread easily through coughs, sneezes, touch or contaminated surfaces.

Oct 23, 2025 · Learn how to recognize the signs of a bacterial or viral infection and when you should seek treatment.

Nov 8, 2023 · Viruses cause familiar infections such as the common cold, but they also cause severe illnesses. Learn more about viral infections and their symptoms.

Dec 19, 2025 · Symptoms of the flu such as a sore throat and a runny or stuffy nose are common. You may also get these symptoms with other illness such as a cold. But colds tend to start slowly, and the …

Nov 3, 2025 · COVID-19 is a respiratory condition caused by a coronavirus. Some people are infected but don’t notice any COVID-19 symptoms (doctors call that being asymptomatic). Most people have …

Oct 8, 2025 · Symptoms of a cold usually occur gradually without causing a fever or body aches, which usually occur with flu. Flu signs and symptoms develop very rapidly and extreme tiredness is …