Neurological disorder
A neurological disorder or condition was a type of medical condition that affected one's nervous system.

Jean-Luc Picard suffered from a small structural defect in his parietal lobe, which possibly made him susceptible to several neurological disorders including Irumodic Syndrome. ()

After being affected by a manipulated vinculum, Seven of Nine began to suffer from a neurological disorder which The Doctor characterized as the Borg equivalent of a multiple personality disorder. ()

In 2375, Kathryn Janeway explained to Seven of Nine that she might be experiencing a neurological disorder after she displayed the personalities of several different individuals. ()

Tuvok suffered from a degenerative neurological condition particular to Vulcans that he had not informed Captain Janeway about. It could only be cured by fal-tor-voh. In an alternate timeline, he was unable to receive the treatment in time to prevent his developing permanent mental problems by 2404. ()

Disorders 
 Albright-Salzman syndrome
 Clarke's Disease
 Forrester-Trent Syndrome
 Iresine Syndrome
 Irumodic Syndrome
 Multiple personality disorder

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Medical conditions