What Causes Pressure In The Ears Post Head Injury?
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Detailed Answer:
I read your question carefully and I understand your concern.
After a head trauma, even if there are no major damages like hemorrhage (which would manifest with other symptoms and warrant an urgent CT scan - but after a month I would say the risk has passed), there still can be some symptoms due to some diffuse microscopic damage to some brain cells from the impact on the skull and the sudden movement.
For that reason even in mild traumatic injury there can be such symptoms such as ear ringing or fullness sensations such as those described, headaches, concentration issues, mood changes etc. These changes do improve with time but can take several weeks or months. There is no specific treatment, only rest and very gradual return to activity. By rest I do not mean only physical but also rest from activities requiring thinking.
It is good that his doctor wants to be prudent and order MRI if he doesn't get better, but in the meantime you should try not to overworry because as I said such symptoms are common and most times do not require any specific treatment.
I remain at your disposal for other questions.