Harvard Health Content API

Sometimes respiratory symptoms are due to something other than a cold, COVID-19, or flu.

 

Some viruses start in animals and then spread to humans.

 

Spot key distinctions with this guide.

These illnesses cause similar symptoms, but with some key differences.

They’re all caused by viruses, but they vary in how they affect your body.

Age, weight, and underlying conditions all play a role.

It’s not the same virus that causes influenza.

Decongestants found in cold medicines can raise blood pressure.

Certain groups of people are more vulnerable.

Always check with your doctor, and follow dosing instructions on the label.