We examine patients with different autonomic neuropathies and Ehlers Danlos syndromes compared to healthy controls at three different points over time (baseline, after 3 months and after 1.5 years) to gain knowledge about the course of this disease and understand its pathophysiology, with a focus on Small Fiber neuropathy. Moreover we will validate the german version of the Malmö POTS Score and establish an easy diagnostic scheme for patients in outpatient care.

Inclusion of patients with autoimmune autonomic neuropathies/ pure autonomic failure, postural orthostatic tachycardia syndrome, small fiber neuropathies, Ehlers-Danlos syndromes, Mast cell activation syndrom, Chronic fatigue syndrome and PostCOVID syndrome in our Registry study with follow up visits. Comparison to healthy controls concerning selected examinations.

Planned examinations are laboratory tests, questionnaires on mental and physical health status and circulatory disorders, attention tests, tilt table testing, standing test, sweat function, investigation of small fiber function via quantitative sensory testing as well as the density of nerve fibers in the skin. Measurements are performed at baseline mostly in clinical routine and follow up visits are offered.

Inclusion Criteria:

• autonomic neuropathy
• Postural orthostatic tachycardia syndrome
• hypermobile or classical Ehlers Danlos syndromes
• Chronic fatigue syndrome, mast cell activation syndrome and/or PostCOVID
• healty controls
• between 18-80 years
• in patients: diagnosis and clinical testing in our outpatient clinic
• German speaking

Exclusion Criteria:

• pregnancy
• Pacemaker or Deep brain Stimulation
• sensory or motor Polyneuropathy
• neurodegenerative disease

We will include patients with above mentioned disease who are diagnosed and treated in our outpatient clinic for autonomic disorders in Aachen, Germany.