Dec 19, 2025 · Learn more about the symptoms, causes and prevention of this potentially deadly viral infection that attacks the respiratory system.

Dec 19, 2025 · Learn more about the symptoms, causes and prevention of this potentially deadly viral infection that attacks the respiratory system.

Oct 8, 2025 · Unlike a cold, the flu tends to come on suddenly and makes you feel much worse than a cold. Common symptoms of the flu often include a fever but not always, as well as headache, aching …

Oct 22, 2025 · What symptoms do COVID-19 and flu have in common? COVID-19 and seasonal flu have some of the same symptoms. These include: Fever. Dry cough. Shortness of breath or trouble …

Nov 17, 2020 · Flu is a general term for seasonal influenza, which is a viral infection that attacks your respiratory system. Symptoms often come on suddenly and may seem like a cold at first, with a runny …

May 24, 2023 · Symptoms Most often, common cold symptoms start 1 to 3 days after someone is exposed to a cold virus. Symptoms vary. They can include: Runny or stuffy nose. Sore or scratchy …

Dec 19, 2025 · 概述 流感也被称为流行性感冒，是指鼻、咽喉和肺部（均属于呼吸系统的一部分）受到的感染。流感是由病毒引起的。流行性感冒病毒与引起腹泻和呕吐的“胃肠型流感”病毒不同。 大多数流 …

Dec 30, 2024 · Flu symptoms include sore throat, runny or stuffy nose, fever, body aches and fatigue. These symptoms may overlap with other illnesses, like the common cold, but key differences exist.

Jun 13, 2020 · This type of pneumonia can occur on its own or after you've had a cold or the flu. It may affect one part (lobe) of the lung, a condition called lobar pneumonia.

Oct 22, 2025 · Flu symptoms usually appear about 1 to 4 days after exposure to an influenza virus. COVID-19 can cause more-serious illnesses in some people than can the flu. Also, COVID-19 can …