Your son is very young still but he is very clear about the 'rattling' sound he hears when he shakes his head. This symptom is not the usual complaint with a common condition called 'swimmers ear' which is an infection of the outer ear canal. So it is unlikley to be due to his swimming. Other possible causes are: a condition called 'tinnitus' which is a ringing or swooshing sound in the ears or a very common problem called glue ear where fluid accumulateds in the middle ears behind the ear drums. There is another rare cause of this complaint as well due to an inborn abnormality of blood vessels inside the skull called an 'arterio-venous malformation' For all these reasons it would be best to see an expert about your son's complaint. It would probably be best to see an ENT specialist first.
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