This document discusses alterations of eccrine sweat glands, including hyperhidrosis (increased sweating), anhidrosis (lack of sweating), and miliaria. It describes different types of each alteration such as generalized vs localized hyperhidrosis, causes, symptoms, and treatments. The most common technical difficulties during thoracoscopic sympathectomy for plantar hyperhidrosis were pleural adhesions and anatomical variations such as azygos lobes. Postoperative satisfaction was initially high but decreased over time due to recurrence risk, while effectiveness and lack of compensatory sweating led to an excellent quality of life for most patients.