There is no treatment for synesthesia because it is not a disease. Beides doing research, I suggest letting it be, as taking drugs will only lessen it.

Ten in a million.

Research estimates around ten in a million people have synaesthesia.

yes he does. he has lexical synesthesia

Synesthesia in Tagalog is "sinesestesiya." It is a sensory phenomenon where stimulation of one sense triggers an involuntary experience in another sense.

Richard E. Cytowic has written:

'Synesthesia' -- subject(s): Physiological aspects, Physiological aspects of Synesthesia, Senses and sensation, Synesthesia

'Wednesday is indigo blue' -- subject(s): Synesthesia, Emotions and cognition