When Should You See a Doctor for a Cold vs. the Flu?

The common cold and influenza (flu) share many symptoms, including cough, congestion, and fatigue. However, the flu tends to be more severe and can lead to complications, particularly in vulnerable populations. Cold symptoms typically develop gradually and include a runny or stuffy nose, sore throat, sneezing, and mild body aches. The flu, by contrast, often comes on suddenly with high fever (above 38°C), severe body aches, intense fatigue, and dry cough. For most healthy adults, a cold resolves within 7 to 10 days without medical treatment. The flu may also resolve on its own, but certain situations warrant seeing a doctor. Seek medical attention if you experience difficulty breathing or shortness of breath, chest pain, persistent vomiting, symptoms that improve then return with fever, or confusion or severe drowsiness. Certain groups are at higher risk for flu complications and should consult a physician promptly. These include adults over 65, children under 5, pregnant individuals, and those with chronic medical conditions such as asthma, diabetes, or heart disease. Antiviral medications such as oseltamivir (Tamiflu) can reduce flu severity if started within 48 hours of symptom onset. A physician can determine whether antivirals are appropriate. A virtual appointment can help assess your symptoms and recommend appropriate care without visiting a waiting room while contagious. *This article is for informational purposes only.*

This article is for informational purposes only and does not constitute medical advice. Content reviewed by licensed Canadian physicians. Last updated February 2026.