Cerumen is secreted by the glands in the external auditory canal for the purpose of cleaning and moistening that canal. The amount of cerumen produced differs considerably from one man to another. In some people, so little cerumen is created that it never accumulates in the external auditory canal. In other, cerumen production is so big that it accumulates and blocks the canal every few months.
The symptoms of a cerumen blockage include a feeling of fullness (in the ear), partial deafness, ringing in the ear, and (less frequent) ear pain and dizziness.
Self-help: cerumen can often be removed by lightly pushing a piece of cotton into the ear. If the cerumen is tough, soften it with an olive oil (or some preparation made for this purpose) warmed up to the temperature of your hands. Apply olive oil drops several nights until the cerumen is soft enough.
If you are working in a dusty environment and if you are prone to cerumen blockage, consider applying earplugs on a workplace.
Professional help: if you can not remove the cerumen by yourself, the doctor will use the syringe to clean your ear with a lukewarm water and remove the cerumen. Cerumen is often softened by ear drops. When it is difficult to remove it, the doctor will squeeze it with a probe.