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; ...
Take note that if you find yourself in contact with poison ivy, poison oak, or poison sumac, you should try to wash off your skin with soap and water as soon as possible. If you're lucky, you might be able to wash off the urushiol oil that causes the rash before it penetrates the skin and avoid having to treat the rash afterwards.