The standard treatment for palmar hyperhidrosis is bilateral sequential thoracic sympathectomy. High rates of compensatory sweating due to the surgical procedure are described in the literature. In the search for a reduction in this side effect, it is possible that unilateral sympathectomy in the dominant side obtains acceptable results and leads to less compensatory sweating with improvement of the quality of life. The aim of this study it to compare the intensity of compensatory sweating due to the standard treatment, that is, bilateral sequential videothoracoscopic sympathectomy in relation to unilateral thoracic sympathectomy on the dominant side.

Inclusion Criteria:

• Body mass index equal to or less than 28;
• Exclusive palmar hyperhidrosis or palmar hyperhidrosis associated with axillary and / or plantar hyperhidrosis;

Exclusion Criteria:

• Being sinister (or left-handed);
• Craneo-f acial or generalized hyperhidrosis;
• Coagulopathies;
• Previous thoracic surgery;
• Other comorbidities such as cardiological, metabolic, infectious or neoplastic diseases;
• Pregnancy;