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; ...
The rash caused by poison ivy, oak, or sumac generally lasts about two to three weeks. While poison ivy, oak, or sumac rash can be persistent, these rashes are not recurrent. The rash does not lie dormant and then reappear in the same spot.