What diagnosis would modern medicine give Hodor?

Perhaps he received a serious head injury, my friend's uncle fell, broke his head very seriously, there was internal bleeding, he lay in a coma for 2 weeks and his behavior was similar to Khodar, he could hardly speak, or rather did not speak for the first half of the year and only a few obscene words could mumble, then gradually it became better and began to speak more or less.

According to the available data, and they are scarce from the point of view of a neurologist, one could suspect Brock's aphasia or efferent-motor aphasia in Hodor.

The fact that Hodor constantly repeats the same word, is called a speech embolus or speech stereotype.

People with this ailment understand speech, sometimes they can even write, they may retain simplified speech. Preserved intonation and gestures.

The video with a patient suffering from Broca's aphasia perfectly illustrates the features of speech. Pay attention to the moment when the doctor asks the patient to count!

Well, if we partially discard the fantasy, then, judging by the symptoms, Hodor's disease most of all resembles adolescent epilepsy, which is inherited and characterized by the spontaneous emergence of pathological foci of excitation in the brain, leading to convulsive seizures, like the one we observe in episode 6.

However, dementia (acquired intellectual impairment), which also, it seems to me, can be diagnosed in Hodor, appears only a few years (usually about 10) after the onset of epilepsy, when a person suffers many seizures (more than 100), as a result of which necrotic changes occur in the cerebral cortex.

But, in general, what happened to Hordor is hardly possible in real life, so it is difficult to make any real diagnosis: something like epilepsy, but the brain is not gradually, but instantly and very badly damaged.