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Excessive Sweating

Medically Reviewed April 2023, by Dr. Ayad Harb, one of the world's leading plastic surgeons

What Causes Excessive Sweating? 

Excessive sweating, or hyperhidrosis, can be a puzzling condition, with its underlying causes divided into two principal categories: primary and secondary hyperhidrosis. Each category has its unique attributes and potential origins, making the study of hyperhidrosis a complex medical issue that requires a nuanced understanding.

Primary hyperhidrosis typically begins in childhood or adolescence and may continue into adulthood. Unlike secondary hyperhidrosis, which can be traced to underlying medical conditions, primary hyperhidrosis is often idiopathic, meaning its exact cause is unknown. This form of excessive sweating usually affects specific areas, such as the palms, soles, underarms, or face, and it may be symmetrical, meaning it affects both sides of the body equally.

The idiopathic nature of primary hyperhidrosis has led researchers to explore several potential contributing factors. Genetics might play a role, as individuals with a family history of hyperhidrosis may be more likely to develop the condition. Abnormalities in the sympathetic nervous system, which controls the sweat glands, have also been suggested as a possible cause. Emotional factors, such as anxiety and stress, might exacerbate the condition, although they are not believed to be primary causes.

In contrast, secondary hyperhidrosis is directly linked to underlying medical conditions or medications, making it a more traceable form of excessive sweating. This type tends to be generalized, affecting the entire body, rather than localized to specific areas.

Thyroid disorders are a common underlying cause of secondary hyperhidrosis. An overactive thyroid gland can lead to increased metabolic rate, causing the body to produce more heat and, consequently, more sweat. Similarly, infections such as tuberculosis or HIV can lead to excessive sweating as the body's response to fight the infection.

Neurological conditions, including Parkinson's disease and spinal cord injuries, may disrupt the normal functioning of the nervous system, leading to abnormal sweat production. Certain medications, particularly those used to treat psychiatric conditions or cardiovascular issues, can lead to increased sweating as a side effect.

Menopause is another factor that may lead to secondary hyperhidrosis, specifically in the form of hot flashes. Hormonal fluctuations during menopause can cause sudden, intense feelings of heat, accompanied by excessive sweating. Diabetes, with its impact on the nervous system and glucose regulation, can also lead to abnormal sweating patterns.

Environmental factors, such as exposure to warm temperatures or engaging in strenuous physical activities, might contribute to normal sweating but can exacerbate hyperhidrosis in predisposed individuals. These external triggers interact with internal mechanisms, compounding the complexity of the condition.

Secondary hyperhidrosis, given its linkage to other medical conditions, requires careful examination and diagnosis. Understanding the root cause can help in providing targeted treatment and may even uncover previously undiagnosed medical issues.

Excessive sweating, whether primary or secondary, is a multifaceted condition with a myriad of potential causes. The complexity lies in the interaction between genetic predispositions, underlying health conditions, environmental triggers, and even emotional factors. Both primary and secondary hyperhidrosis necessitate careful medical evaluation to determine the exact cause and appropriate treatment. The understanding of what causes excessive sweating continues to evolve, reflecting the intricate nature of the human body and its response to internal and external stimuli.

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Types of Excessive Sweating

Focal Hyperhidrosis

The first type, focal hyperhidrosis, is characterized by excessive sweating in specific areas of the body. Commonly affected regions include the palms of the hands, soles of the feet, underarms, and sometimes the face. This localized sweating often occurs symmetrically, meaning that both sides of the body are affected equally. Focal hyperhidrosis typically begins in childhood or adolescence and may persist into adulthood. The exact cause of this type remains somewhat elusive, but genetics may play a role. Treatment for focal hyperhidrosis often involves localized therapies, including prescription antiperspirants, anti-wrinkle injections, or laser therapy.

Generalized Hyperhidrosis

In contrast to the localized nature of focal hyperhidrosis, generalized hyperhidrosis affects the entire body. This form of sweating is often related to underlying medical conditions, such as thyroid disorders, infections, or neurological diseases. Certain medications can also lead to generalized hyperhidrosis as a side effect. Unlike focal hyperhidrosis, generalized sweating may begin at any age, reflecting the onset of the underlying condition responsible for the symptoms. 

Diagnosis and treatment for generalized hyperhidrosis require careful medical evaluation to address the root cause.

Secondary Hyperhidrosis

Within the generalized category, there is often reference to secondary hyperhidrosis, stemming from underlying health issues or medications. It is vital to differentiate this from primary or focal hyperhidrosis, as the treatment approach will vary significantly. Secondary hyperhidrosis might necessitate treating the underlying medical condition or altering medication, whereas primary hyperhidrosis requires targeted therapy to the affected areas.

The types of excessive sweating are multifaceted and hinge on whether the symptoms are localized to specific regions (focal hyperhidrosis) or spread throughout the body (generalized hyperhidrosis). The distinction between these types is crucial for medical professionals when devising an effective treatment plan, reflecting the need for an individualized approach tailored to the particular type and underlying cause of the hyperhidrosis.

Excessive Sweating Treatments

Anti-Wrinkle Injections

Anti-wrinkle injections have become a widely accepted treatment for localized hyperhidrosis, particularly in areas like the underarms, hands, and feet. Botulinum toxin works by blocking the neurotransmitters that stimulate sweat glands, effectively reducing sweating in the treated areas. The procedure involves injecting small amounts of Botox into the skin, using a fine needle to target the affected sweat glands.

Patients usually see a reduction in sweating within a week after treatment. However, the effects of the treatment are temporary, lasting anywhere from four to twelve months, depending on the individual. Regular follow-up injections may be required to maintain the results. Side effects are typically minimal but may include temporary pain or bruising at the injection site.

Laser Therapy

Laser therapy represents an innovative approach to treating excessive sweating. It utilizes focused light energy to target and reduce overactive sweat glands. Unlike anti-wrinkle injections, laser treatments are considered less invasive and may offer a more permanent solution for some individuals.

The procedure is performed under local anesthesia and usually takes less than an hour. The laser's energy is directed to the sweat glands, causing a controlled reaction that reduces their activity. Recovery time is relatively short, and patients can typically return to normal activities within a day or two. Side effects may include temporary redness or swelling, but serious complications are rare.

Antiperspirants

Prescription-strength antiperspirants are often the first line of treatment for mild to moderate hyperhidrosis. These topical solutions contain active ingredients, such as aluminum chloride, which work to block the sweat ducts.

Application usually involves nightly use initially, followed by a reduction in frequency as the symptoms improve. While antiperspirants are generally effective for many individuals, they may cause skin irritation or discomfort in some cases. Ongoing use is typically required to maintain the benefits, and this treatment is often used in conjunction with other therapies for more severe cases.

Medications

Oral medications, such as anticholinergics, are prescribed to reduce sweating in cases of generalized hyperhidrosis or when other treatments are unsuitable. These medications work by inhibiting the action of acetylcholine, a neurotransmitter that stimulates sweat glands.

Although effective, oral medications may produce side effects, including dry mouth, blurred vision, constipation, or urinary retention. Monitoring and medical guidance are essential to manage potential risks and ensure that the benefits outweigh the drawbacks.

Surgical Intervention (Endoscopic Thoracic Sympathectomy)

 For severe cases of hyperhidrosis, particularly when other treatments have failed, surgical intervention may be considered. Endoscopic thoracic sympathectomy (ETS) is a procedure that interrupts the sympathetic nerves responsible for excessive sweating.

The surgery is performed under general anesthesia and involves making small incisions to access the nerves. The surgeon then cuts or clamps the nerves to reduce their activity. While ETS can be highly effective, it does carry potential risks and long-term side effects, including compensatory sweating in other areas of the body. Careful consultation with a medical specialist is essential to determine if this approach is appropriate.

The treatment of excessive sweating is multi-dimensional, and the choice of therapy must be individualized based on the type, cause, and severity of hyperhidrosis. The advancements in medical technology and the availability of various treatments provide a range of options for sufferers, promising significant relief and an improved quality of life. Consultation with healthcare providers skilled in this area ensures an accurate diagnosis and the optimal selection of treatment modalities.

About Our Clinic

Located in the heart of Ascot, Bicester, and London, the SRGN Clinic exemplifies afusion of cutting-edge science, unparalleled skill, and an unwavering commitment to patient care. The clinic stands as a beacon of excellence in thefield of aesthetic and plastic surgery.

Leading the team at SRGN is Dr. Ayad Harb, a renowned plastic surgeon and aesthetic trainer. His expertise, honed by years of experience and a genuine passion for improving lives, defines the very core of the clinic's ethos. Dr. Harb's innovative techniques, combined with an artistic eye for detail, enable him to deliver consistently exceptional results that are tailored to each patient's individual needs and desires.

At SRGN, we believe in the transformative power of aesthetic and plastic surgery. Our treatments, ranging from non-invasive procedures to complex surgical interventions, are designed to enhance and accentuate your natural beauty. We strive to provide a safe, comfortable, and confidential environment where you can discuss your aesthetic goals openly, and together we create a treatment plan that brings these goals to life.

Every member of the SRGN team shares a deep commitment to patient care. We prioritise your comfort, safety, and satisfaction from the moment you step into our clinic. Each of our facilities mirrors the luxury and tranquility of their surroundings, offering a serene space where you can embark on your journey to self-improvement.

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