The ringing that you are referring to is called Tinnitus and it is very common. Most people suffer from it at least a few times in their lives. The problem is that it can be caused by a number of things, of which blood pressure is one possibility. It is important to find the root problem, so that one can deal wiht it. If his general health is in order, i would advise him to see an Audiologist and have a full hearing evaluation done. He/she would then be able to advise some treatment or lifestyle adjustments. If you need the name and detail of an Audiologist in your area, please let me know and i will gladly refer you (firstname.lastname@example.org). There are several options available for the treatment of Tinnitus.
In the meantime, here is a few general tips. Make sure that you rest enough and that your stress levels are not too high. Have a healthy balanced lifestyle and diet. Refrain from smoking and excessive drinking. Make sure that you don't spend too much time, in a completely quiet environment, play soft music in the background, that could mask our the audibility of the tinnitus.
Please let me know if you need any further information
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