A Pesticide Information Project of Cooperative Extension Offices
of Cornell University, Michigan State University, Oregon State
University, and University of California at Davis. Major support
and funding was provided by the USDA/Extension Service/National
Agricultural Pesticide Impact Assessment Program. When external
circumstances (like extreme heat or cold) or internal conditions
(disease or poisoning) cannot be adjusted by normal mechanisms,
the signs of discomfort and disease appear. The types of
physical effects seen or felt (signs and symptoms) depend on the
type of stress to which the body has been exposed. Because there
are so many complex interrelationships between the systems
within the body, a single change in any one system may result in
numerous effects in other systems. In addition, the types of
response to disease are limited, thus signs and symptoms of
disease are often quite similar for different diseases. For
example, headache, fever, nausea, vomiting and diarrhea are very
common non-specif