Prior to the onset of hypothermia the body maintains a relatively stable temperature whereby heat production is balanced by heat loss. When the outside environment gets too cold or the body's heat production decreases, hypothermia occurs (hypo=less + thermia=temperature).
The main symptom of poison oak, ivy, or sumac is an intensely itchy, red rash. ... However, you should contact a doctor right away if you are highly sensitive or have the following symptoms: Swelling of the face or throat; Rash on the genitals; ...
Generally, Poison Ivy grows east of the Rockies and Poison Oak west of the Rockies, and Poison Sumac is usually found in the southeastern United States. Once the oil is on the skin, a person has around 1-4 hours to wash it off. This rash usually starts within 2-6 hours after exposure, depending on sensitivity.