Our expert says:
If they do it per endoscope, they need to insert a drain to help inflate the lung after the procedure, so you will be in hospital for a day or so. It will be sore and uncomfortable for a week or so at least.
Risks include bleeding, infection and pneumothorax or lung collapse. Those risks specific to sympathectomy include Compensatory Sweating (occurring in sites other than the original site of hyperhidrosis) - about 50% of people experience this- and Horner’s Syndrome (decreased facial sweating, eyelid drooping, and enlarged pupil on the opposite side) which only happens in a small % of patients.
See this article on the procedure: http://www.umm.edu/thoracic/thoracic5a.htm
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