"Sweat is secreted by sweat glands, normally as a thermoregulatory response. No changes to the sweat glands (e.g. increased quantity or size) are observed in individuals with focal hyperhidrosis, so the condition is hypothesised to arise due to overactivity of the sympathetic nervous system (the section of the nervous system that regulates involuntary muscle movements), which sends the signals to the sweat glands to trigger sweating. Other neurological pathways (pathways of the nervous system) involving the cerebral cortex (an area of the brain that processes complex information and regulates voluntary movement) and hypothalamus (a hormone-producing gland in the brain) are also thought to play a role in hyperhidrosis, as is the parasympathetic nervous system."
https://archive.today/xyNQ2
or
http://sydneynorthneurology.com.au/focal-hyperhidrosis/
"Surgeons perfoming sympathectomies routinely withhold information vital to informed consent. Anyone who does objective comparison between what is documented in medical/scientific literature and what is typically disclosed to prospective ETS patients has no choice but reach this conclusion." http://etsandreversals.yuku.com/reply/22927/Would-you-do-it-again#reply-22927
Cell body reorganization in the spinal cord after surgery to treat sweaty palms and blushing
The amount of compensatory sweating depends on the patient, the damage that the white rami communicans incurs, and the amount of cell body reorganization in the spinal cord after surgery.
www.ubcmj.com/pdf/ubcmj_2_1_2010_24-29.pdf
After severing the cervical sympathetic trunk, the cells of the cervical sympathetic ganglion undergo transneuronic degeneration
After severing the sympathetic trunk, the cells of its origin undergo complete disintegration within a year.
http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0442.1967.tb00255.x/abstract
Spinal cord infarction occurring during thoraco-lumbar sympathectomy
J Neurol Neurosurg Psychiatry 1963;26:418-421 doi:10.1136/jnnp.26.5.418
www.ubcmj.com/pdf/ubcmj_2_1_2010_24-29.pdf
After severing the cervical sympathetic trunk, the cells of the cervical sympathetic ganglion undergo transneuronic degeneration
After severing the sympathetic trunk, the cells of its origin undergo complete disintegration within a year.
http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0442.1967.tb00255.x/abstract
Spinal cord infarction occurring during thoraco-lumbar sympathectomy
J Neurol Neurosurg Psychiatry 1963;26:418-421 doi:10.1136/jnnp.26.5.418