A myth is a widely held but false belief. If it is repeated often by enough people, those who know the truth may start to doubt themselves. Indeed, George Orwell said that myths which are believed in tend to become true. Our department has repeatedly been told by parents that drinking milk increases mucus production from the lungs, and so they stop their child having milk. This is particularly so in patients with conditions associated with excess mucus, for example, cystic fibrosis and primary ciliary dyskinesia, but also includes children with infant wheeze or asthma. Indeed, many people believe milk should be avoided with any respiratory illness, even a common cold.. To read the full article, log in using your NHS OpenAthens details.