One type of hyperhidrosis has been called mental, emotional, and intentional by dermatologists and neurologists. They have noted that a profuse, cold, clammy sweating occurs on the palms and soles, or in the axillae, during mentally stressful activities. It is always bilateral, and usually unrelated to external temperature changes or internal pathological conditions. Often the palms and feet are involved together, but the condition can be confined to one or the other. The sweating in the axillae appears to be independent of that in other areas.
Kuno6 noted that thermal sweating appears universally over the general body surface whereas "mental" sweating appears over the palms, soles, and axillae. He found that this condition existed in 1 out of every 300 Japanese students he examined. Everything they touched became wet, which interfered with many vocational activities. Kuno attempted to explain this phenomenon with
SEIDENBERG R. Palmar Hyperhidrosis and LinkingSuggestive Formulations from an Incompletely Treated Case. Arch Gen Psychiatry. 1961;4(3):283–288. doi:10.1001/archpsyc.1961.01710090069009