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Focal vs Generalized Hyperhidrosis It is important to understand the difference between focal and generalized hyperhidrosis. You may also see the terms primary and secondary hyperhidrosis respectively. These terms are essentially interchangeable.
Focal or Primary Hyperhidrosis (FHH)
Typically a localized condition, focal hyperhidrosis occurs in regions such as the underarms, soles of the feet, palms, face/neck, scalp/head or groin. It is also called primary hyperhidrosis because it does not result from, or is not secondary to another existing or underlying condition (exceptions include causes due to neurological/nerve damage such as spinal injury or Frey’s syndrome). In medical terms, we refer to this as an idiopathic condition. Not sure you have Primary or Focal Hyperhidrosis?
Determining whether you have focal hyperhidrosis usually involves the presence of regionalized or site-specific excessive sweating for at least 6 months. You should also have at least two of the following factors*:
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Generalized or Secondary Hyperhidrosis (GHH)
This condition is more general in nature and does not favour any specific site or region. The excessive sweating tends to involve the whole body or at least larger aspects of the body. The other key difference is that there exists an underlying condition which is causing the profuse sweating. Another way of thinking about GHH is that it is actually a symptom of an underlying condition or disease. Some possible causes associated with GHH include* –
Follow up diagnostic tests are required to determine the exact cause or condition.
Facts & Figures
A review of over four hundred (415) individuals with hyperhidrosis from an outpatient clinic revealed the following**:
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*Haider A, Solish N. Can Med Assoc J. 2005; 174(1): 69-75 **Walling HW. J Am Acad Dermatol. 2011; 64(4): 690-5