You can help prevent colds by washing your hands regularly. This destroys bugs that you may have picked up from touching surfaces used by other people, such as light switches and door handles.
Read this guide to how to wash your hands properly.
It's also important to keep the house and any household items such as cups, glasses and towels clean, especially if someone in your house is ill.
Top tip: If you get a cold, use disposable tissues instead of fabric handkerchiefs to avoid constantly reinfecting your own hands.
Read five surprising facts about the common cold.