What Happens When You Catch a Cold

Cold viruses sneak into nasal or throat cells and start multiplying.
The immune system detects viral proteins and sounds the alarm.
Inflammation swells tissues, causing congestion and sore throat.
White blood cells flood the area to attack infected cells.
Fever may rise slightly as your body fights the invader.
Mucus thickens to trap and flush out viral debris.
Sneezing and coughing help clear the airways.
After recovery, memory cells remember that specific virus.
That’s why you recover faster next time—if it’s the same strain.
Each sniffle is really a small victory for your immune team.