Milk and the Common Cold
The only thing that spreads faster than the common cold is the common misconception that you should avoid milk if you have a cold. This is simply not true.
Does milk cause mucus production (nasal secretions) during a cold?
No. Some people wrongly believe that they have to avoid milk if they have a cold. No research has confirmed that milk consumption increases the production of mucus or other cold-related symptoms.
However, it is interesting that people who believe this myth report more symptoms (e.g. difficulty swallowing, thick saliva, and congestion) than people who do not.