Parkinson's Disease is the deteriorating illness of the nervous system, particularly the central nervous system. The central nervous system or the CNS is the area of the nervous system that acts to integrate and harmonize the functions of all body parts. This disease affects neurons or nerve cells in the area of the brain that administer muscle movements. Parkinson's disease is also called paralysis agitans or shaking palsy.

There are 5 stages of Parkinson's disease. The first stage is considered as the early or mild disease. The second stage is when both sides of the body are affected but posture stays the same. The third stage is considered the moderate stage and the fourth stage is the advanced stage. The fifth stage is the severe stage. On the mild or early stage of the disease, the manifestation affects only half of the body, inconveniencing but doesn't render the patient as an invalid yet. The most noticeable changes would be on the demeanor, the mobility or the action and the countenance of the patient.

It is during this stage when doctors and physicians make most of their diagnosis mistakes due that the symptoms are the only basis they have for their analysis. These symptoms are very subtle and happen in very slow successions. If the symptoms are stopped early, therapy management may be given at such a very opportune time that could help deliberate the advancement of the disease.

People closest to the patient like family and friends are usually the ones to notice the changes first. Examples of such changes are the languor or the retardation of a person's ability to move, a shaking when an arm or leg is reposed and relaxed, these changes or symptoms happening only in one part of the body and when given the certain drug called levodopa used to treat Parkinson's, a compelling reaction happens.

These changes becomes an ailment rather than just an inconvenience to everyday life as the disease advances to a more serious and severe stage. The involuntary shaking alone makes pose it difficult for a person to function on such basic activities such as holding a spoon or reading a book.
Most people are urged to seek medical assistance at the onset of the shaking.