Description: Douglas-fir trees, which are also called red firs, Oregon pines, and Douglas spruce, are neither true fir trees nor pines nor spruces! The scientific genus name Pseudotsuga means âfalse hemlock,â alluding to another kind of tree that Douglas-firs are similar too.Douglas-firs are evergreen trees, meaning that they keep their needle-like leaves year round.There are two varieties of this species, coast Douglas-fir and Rocky Mountain Douglas-fir, which are differentiated by their habitats, growth rates, and physical characteristics.he scientific genus name Pseudotsuga means âfalse hemlock,â alluding to another kind of tree that Douglas-firs are similar too. Douglas-firs are evergreen trees, meaning that they keep their needle-like leaves year round.
Chronic hives are defined as hives that last more than six weeks or hives that go away, but recur frequently. In most cases of chronic hives, a cause is never clearly identified. In some cases, chronic hives may be related to an underlying autoimmune disorder, such as thyroid disease or lupus.While the underlying cause of chronic hives is usually not identified, treatment can help with symptoms.ives and angioedema also occasionally occur in response to blood transfusions, immune system disorders such as lupus, some types of cancer such as lymphoma, certain thyroid conditions, and infections with bacteria or viruses such as hepatitis, HIV, cytomegalovirus or Epstein-Barr virus.
Viral Infection. The most common cause of hives all over the body is viral infections. Research has confirmed this. Other symptoms such as a fever, cough or diarrhea are also present. The hives may last 3 days. This is not an allergy.