Currently, research is being done on a test that may detect Parkinson's disease in its early stages, before it affects speech and movement. However, the symptoms may be difficult to assess, particularly in the elderly. For example, the tremor may not appear when the person is sitting quietly with arms in the lap. The posture changes may be similar to osteoporosis or other changes associated with aging. Lack of facial expression may be a sign of depression .
Reflexes are essentially normal.
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