Get, have, etc. the sniffles
Definition 1 of 1
Pro Tip 1/3Mild Illness
Indicates a light, often short-term illness, less severe than a full-blown cold. 
Don't worry about Tim; he just has the sniffles and should be fine in a day or two.
Pro Tip 2/3Casual Context
Used in everyday conversation and is not suitable for formal writing or speeches. 
If Lisa has the sniffles tomorrow, can you cover for her at the bake sale?
Pro Tip 3/3Not Contagious
May imply a harmless condition, suggesting that the person isn't seriously ill or contagious. 
I might skip the gym today since I have the sniffles, but I'll be back to work tomorrow.