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; ...
What Causes the Rashes of Poison Ivy, Oak, and Sumac? Many people break out in a rash when urushiol touches the skin. And even if you don't recall touching the leaves of poison ivy, oak, or sumac, you may have unwittingly come in contact with their roots or stems. Urushiol quickly penetrates the skin, often leaving red lines that show where you brushed against the plant.