Poison ivy, oak, and sumac facts. 1  Poison ivy, poison oak, and poison sumac are plants than can cause an itchy rash upon contact. 2  A substance called urushiol, found in these plants, causes the rash. 3  The rash is not contagious.  The rash usually disappears in one to three weeks.
Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Tremor) that could possibly cause Tremor includes: 1  Parkinson's disease. 2  Drug-induced tremor. 3  Parkinson disease 8 - tremors.  Parkinson disease 13 1  - tremors. Neuhauser-Daly-Magnelli syndrome - tremors.  Multiple endocrine neoplasia - Tremors.
Tremors, in general, can be caused by a variety of conditions like Parkinsonâs disease, overactive thyroid, alcoholism and stroke. These tremors are not characterized as essential tremor. The exact cause of essential tremor is unknown. Scientists have not found absolute genetic or environmental causes, and no cellular defect has been linked to the condition.