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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.
Ear ringing, or tinnitus, can happen for two reasons. If you have fluid or an infection in your middle ear, you may hear a constant buzz. However, the more common cause is damage to the microscopic ends of your hearing nerves, which often happens when you're exposed to loud noises.