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This clinical trial will collect data on the safety and efficacy of the miraDry treatment when High Volume Anesthesia (Tumescent Anesthesia) is used as an alternate method of anesthetizing the axilla prior to the miraDry System being used. MiraDry system was FDA cleared in 2011 for the treatment of primary axillary hyperhidrosis. The miraDry system is also CE-marked.

Hyperhidrosis is a condition defined as sweating beyond what is physiologically required by the body (excessive sweating). Hyperhidrosis sufferers have been shown to suffer from anxiety, social and occupational impairment and limitation of exercise, recreation, and leisure. In addition to psychological and social issues, hyperhidrosis sufferers see significant financial burden from their condition. The costs of treatments which need to be repeated chronically and replacing clothing which is permanently stained and unwearable can amount to significant expenditures over time.

Many physicians using the miraDry System are using alternative methods for anesthetizing the axilla; the most common is infiltrative local tumescent anesthesia (LTA) at a high volume. miraDry often calls this method as High Volume Anesthesia (HVA) and the two terms are used interchangably. Tumescent anesthesia is commonly used for various dermatologic surgery procedures. This method involves using a larger volume of fluid with a lower concentration of lidocaine; the fluid is introduced under the skin through a few small injection sites and infiltrated into the desired region. For this application using the tumescent technique, between 100 and 300 cc's of fluid per axilla would be introduced subcutaneously, depending on the size of the axilla.

This clinical trial will collect data on the safety and efficacy when High Volume Anesthesia is used as an alternate method of anesthetizing the axilla prior to the miraDry System being used. The investigators participating in this study are experts in the administration of tumescent anesthesia for dermatologic applications.

Inclusion Criteria:

1. Adults (aged ≥18 years) at time of consent.
2. A HDSS score of 3 or 4.
3. Excess sweating evidenced by at least two of the following:

a. Impairs daily activities b. Frequency of at least one episode per week c. Age of onset less than 25 years old d. Positive family history e. Cessation of focal sweating during sleep d) In the opinion of the physician, treatment with the miraDry System is technically feasible and clinically indicated.

e) Willing and able to comply with protocol requirements and all study visits. f) Female patients of child-bearing potential must not be pregnant or lactating and must agree to not become pregnant during the course of the study.

Exclusion Criteria:

1. A cardiac pacemaker or cardiac defibrillator or other electronic implant.
2. Requires supplemental oxygen.
3. Known resistance to or history of intolerance of local anesthesia including lidocaine and epinephrine.
4. Secondary excess sweating due to medications, infections, malignancy.
5. Evidence of active infection or prone to infection.
6. Prior liposuction or other dissection surgery for axillary excess sweating.
7. Oral anticholinergic medication use (e.g., Glycopyrrolate) or cholinomimetic medication use within the last 4 weeks or planned use during the study's follow-up phase.
8. Taking any other medication that may hinder post-procedure recovery and/or healing.
9. Botulinum treatment of the axilla within the last 12 months.
10. Currently participating in or recently participated in another clinical trial (within the last 30 days).
11. History of or current neurologic deficit in the treatment area and/or limb.
12. History of cancer with the exception of (1) successfully treated basal cell or squamous cell carcinoma of the skin or (2) a history of successfully treated cancer that have been disease-free for five years.
13. Any history of cysts, hidradenitis suppurativa, etc.
14. Pre-existing conditions at the time of enrollment that overlap with the list of anticipated AEs (Section 6.1).
15. Prior treatment in axillary area with miraDry.