Urushiol, is the rash-causing oil found in all parts of poison ivy, poison oak, and poison sumac plants. Approximately 85% of the population experiences an allergic reaction to these noxious plants, and according to the National Institute of Occupational Health & Safety, 50 micrograms of urushiol is enough to cause a rash in 80-90% of adults.
Sweaty palms, more properly known as palmar hyperhidrosis, is a condition that affects about 1% of the US population. Although the exact cause of sweaty palms is still debated, many experts believe it is caused by a hyperactive sympathetic nervous system, causing the sweat glands in the hands to produce sweat unnecessarily.
1 For example palmoplantar hyperhidrosis or acrohyperhidrosis is symptomatic sweating of primarily the hands or feet. 2  Generalized hyperhidrosis-when the excessive sweating affects the entire body. 3  Primary idiopathic hyperhidrosis-there is no apparent cause. 4  Idiopathic means of unknown cause.