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; ...
Information about poison ivy, oak, sumac and the skin rashes they cause. Poison sumac, Toxicodendron vernix, is related to the poison ivies and poison oaks, not to the other sumacs. It is relatively rare compared to the other members of the family. The rash-causing agent, urushiol, is the same, and it causes the same rashes. While poison sumac is rare, when you find it in its typical wetland habitat, you may find quite a bit. The story goes that there was a lot of it where they cleared the wetland to build Disneyworld in Florida.