Researchers will compare the findings within the ET group to independently existing cohorts of healthy controls and/or patients with other movement disorders like Parkinson's disease. conditions: Essential Tremor studyType: OBSERVATIONAL observationalModel: COHORT timePerspective: PROSPECTIVE count: 100 type: ESTIMATED name: Clinical examination, blood draw, cerebral MRI, sonography, tremor analysis, OCT, olfactory mucosa swab. measure: Prevalence of ET-plus measure: Age of ET patients measure: Sex of ET patients measure: Family history measure: Symptom leading to ET-plus classification measure: current and former medication for essential tremor measure: subjective disease course of ET measure: responsivity to alcohol measure: presence of cardiovascular risk factors measure: MDS-UPDRS (Movement Disorder Society Unified Parkinson's Disease Rating Scale) parts I-IV measure: modified Essential Tremor Rating Assessment Scale (mTETRAS) measure: Scale for the assessment and rating of ataxia (SARA) measure: Verbal fluency animals (part of the CERAD-plus test battery) measure: Boston Naming Test (part of the CERAD-plus test battery) measure: Mini Mental State Examination Test (MMSE; part of the CERAD-plus test battery) measure: word list learning (part of the CERAD-plus test battery) measure: constructive praxis (part of the CERAD-plus test battery) measure: word list recall (part of the CERAD-plus test battery) measure: word list recognition (part of the CERAD-plus test battery) measure: constructive praxis recall (part of the CERAD-plus test battery) measure: Trail Making Test A (part of the CERAD-plus test battery) measure: Trail Making Test B (part of the CERAD-plus test battery) measure: s-words (part of the CERAD-plus test battery) measure: Frontal Assessment Battery (FAB) measure: Geriatric Depression Scale (GDS) measure: Hospital Anxiety and Depression Scale (HADS) measure: Non-Motor Symptoms Scale for Parkinson's Disease (NMSS) measure: RBD Screening Questionnaire measure: Global Physical Activity Questionnaire (GPAQ) measure: Quality of Life in Essential Tremor Questionnaire (QUEST) measure: University of Pennsylvania Smell Identification Test (UPSIT) measure: Montreal Cognitive Assessment (MOCA) measure: Auditory verbal learning test measure: Symbol Digit Modalities Test (SDMT) measure: Brief Visuospatial Memory Test measure: Comprehensive trail making test 4 measure: Comprehensive trail making test 5 measure: Regensburg word fluency test measure: EQ-5D measure: resilience scale (RS-13) measure: Pittsburgh Sleep Quality Index (PSQI) measure: Digital Spiral Drawing measure: Schellong Test measure: serum glial fibrillary acidic protein (sGFAP) measure: serum neurofilament light (sNfL) measure: Transcranial sonography measure: tremor analysis measure: cerebral MRI measure: cerebral MRI measure: cerebral MRI measure: cerebral MRI measure: cerebral MRI measure: cerebral MRI measure: optic coherence tomography (OCT) measure: optic coherence tomography (OCT) measure: optic coherence tomography (OCT) measure: optic coherence tomography (OCT) measure: Olfactory mucosa swab sex: ALL minimumAge: 18 Years stdAges: ADULT stdAges: OLDER_ADULT facility: Medical University of Graz city: Graz zip: 8036 country: Austria lat: 47.06667 lon: 15.45 hasResults: False