Rates of illness tend to soar during winter, but, according to the experts, many conditions can be prevented with hygiene, patience, vaccinations - and even a warm scarf. It's worth thinking about treatments for seasonal ailments in advance too. So here's how to prepare for a happy, and healthy, Christmas.
Dr Ayesha Akbar, consultant gastroenterologist at St Mark's Hospital, London, and spokesperson for the British Society of Gastroenterology.
Dr Richard Russell, consultant respiratory physician in Lymington, Hampshire, and honorary medical advisor to the British Lung Foundation.
GP Dr Harjeev Rai of Hessington Health in Hertfordshire, who is a cardiology specialist.
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