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Could you tell me why the shunt was put in the first place. There could be a block causing high intracranial tension or could be an infection. If there is infection it could lead of Cavernous sinus thrombosis
causing severe eye pain
. Is there any squint
in the eyes. Is the involved eye red and watering. You need to discuss with the Doctor about these issues and seek proper management and relief of the pain. He may take T.Paracetamol
500mg for some pain relief but he needs to be taken to the Neurosurgeon immediately.