Patient dissatisfaction Prolonged exposure to some chemicals agents (detergents) History of head trauma History of sinus surgery or septorhinoplasty, rhinoplasty, turbinectomy and radiation therapy Having neurodegenerative disease (Alzheimer's, Parkinson, MS, epilepsy, seizures) Having mental disorders (schizophrenia and depression) Having neuropsychiatric disorders (autism, Asperger's, lack of concentration and hyperactivity) History of repeated use of the following drugs:Metronidazole, benzocaine, clofibrate, amphotericin B, ampicillin, allopurinol, captopril, baclofen, codeine, carbamazepine and amphetamines.

Patient dissatisfaction Prolonged exposure to some chemicals agents (detergents) History of head trauma History of sinus surgery or septorhinoplasty, rhinoplasty, turbinectomy and radiation therapy Having neurodegenerative disease (Alzheimer's, Parkinson, MS, epilepsy, seizures) Having mental disorders (schizophrenia and depression) Having neuropsychiatric disorders (autism, Asperger's, lack of concentration and hyperactivity) History of repeated use of the following drugs:Metronidazole, benzocaine, clofibrate, amphotericin B, ampicillin, allopurinol, captopril, baclofen, codeine, carbamazepine and amphetamines.