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Hi Sue, The ringing in the ears is called Tinnitus. It can be a side effect of medications (check what you are taking) or for me, it can also be a sign that a migraine is on the way. It could also mean a number of many other things, depending on other symptoms you may have.
Tinnitus, commonly called ringing in the ears, is the sensation of hearing a sound in the ears when no such sound exists. This sound, which comes from inside the head, typically is described as a ringing, but it also can take the form of an annoying hiss, whistle or buzz. Tinnitus can be constant or can come and go. Occasionally, tinnitus is a side effect of medication. Aspirin in moderate to high doses often causes tinnitus.