Could hearing a gunshot sound in head be a stroke symptom?
This does not sound like a stroke symptom. Strokes would not be expected to cause the sensation of a loud noise - unless it was associated with a severe headache - which could indicate a sudden bleed in the head. I would suggest they be seen by their primary care physicians, and that imaging of the brain be considered. If their primary care physician thinks this could be a hearing issue (including problems with the middle or inner ear), an ENT (Ear, Nose, and Throat) doctor consultation could be considered. If imaging of the brain and the vessels of the brain is negative, than their symptoms do not sound Neurological in nature.