What is a viral infection? Viral infections are illnesses you get from tiny organisms that use your cells to make more copies of themselves (viruses). Viral infections commonly cause …

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 …

Jun 2, 2024 · Viruses most often affect your respiratory and digestive systems, but they can cause problems in other parts of your body. Viral infections of your respiratory system include: …

Sep 6, 2025 · Viral infections happen when a virus takes over a cell in your body and starts to multiply. Viruses can spread through direct contact (like kissing or sex), indirect contact (like a …

Sep 9, 2024 · Viral infections are caused by viruses, which are microscopic pathogens that invade living cells to reproduce. These infections can affect various parts of the body and manifest in …

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.

Most commonly, viral infections involve the nose, throat, and upper airways, or systems such as the nervous, gastrointestinal, and reproductive systems. Doctors may base the diagnosis on …

Feb 12, 2025 · Viral respiratory infections are common illnesses that affect the airways, such as the nose, throat and lungs. They can be caused by hundreds of different types of viruses. …

Learn what causes viral infections, how they spread, symptoms to watch for, and how to treat or prevent them with tips from Riverside Health.

Aug 21, 2018 · Viruses are very small infectious agents. They’re made up of a piece of genetic material, such as DNA or RNA, that’s enclosed in a coat of protein. Viruses invade cells in …