Parkinson’s Disease: Symptoms, Causes and Treatment

The Parkinson ‘s disease is a neurodegenerative disorder that affects the nervous system and alters brain function.

Normally this disease is associated with motor symptoms such as tremor or stiffness due to its remarkable appearance.

However, this disease degenerates several brain regions, and can cause many more alterations than those that are connoted in the  movement.

Parkinson Disease Symptoms

In this article we will talk about the characteristics of this disease, its causes and current treatments.

Characteristics of Parkinson’s Disease

The first description of Parkinson’s Disease (PD) was made in 1817 by the physician James Parkinson, calling it “agitated paralysis”.

Subsequently, the neurologist Charcot gave him the current name of Parkinson’s Disease.

PD is a neurodegenerative disease that affects the nervous system, damaging the dopaminergic neurons of the substantia nigra. ‘

This type of neurons (modeled by a substance called dopamine) perform a large number of brain activities, among which the control of  voluntary movements.

However, the function of dopamine and the dopaminergic neurons of our brain is not limited to controlling motor functioning, they also  intervene in other mechanisms such as memory, attention, reward, sleep, mood and inhibition of pain. .

That is why, despite the fact that the main symptoms of PE are alterations in movement, this disease can also produce other types  of symptoms related to the functioning of these dopaminergic neurons.

In addition, it has been shown that PE also affects other substances beyond dopamine, such as serotonin, noradrenaline or acetylcholine, which  reinforce the idea that Parkinson’s can produce a large number of alterations.

In the same way, PE is a chronic and progressive disease, that is, there is currently no treatment to eradicate Parkinson’s disease, and as  the disease progresses, it usually manifests with greater intensity.

It usually originates around the sixth decade of life, affects men more than women and is considered the second most prevalent neurodegenerative disease  .

Motor symptoms

As we have said, the main symptoms of this disease are those that have to do with the coordination of movements.

The control of voluntary movements is carried out in our brain, through the dopaminergic neurons located in the black substance of the brain.

When Parkinson’s disease appears, the functioning of these neurons is altered and they degenerate gradually (neurons in this area  begin to die).

Therefore, our brain is losing mechanisms to perform this type of action, therefore, the messages of when and how to move are  transmitted in a wrong way, a fact that results in the manifestation of the typical motor symptoms of the disease.

These are:

  1. Tremor

This is probably the main symptom of PE, since 70% of people with this disease have tremor as the first manifestation.

This parkinsonian symptom is characterized by tremor when resting. That is to say: although the limbs can be still and without  performing any activity, they present tremor.

It is normal for them to appear on the extremities such as the arms, legs, hands or feet, but they can also appear on facial areas, such as the  jaw, lips or face.

This tremor is usually reduced when performing any specific activity or movement, and increase in situations of stress or anxiety.

  1. Bradicinesia

Bradykinesia is based on the slowness of many Parkinson’s patients to perform the movements.

Due to the involvement caused by PD in dopaminergic neurons, the patient takes much longer to perform a task involving movement than  before the onset of the disease.

Bradykinesia can make it difficult to start movements, reduce its amplitude, or make it impossible to perform specific movements such as buttoning  , sewing, writing or cutting food.

  1. Rigidity

PE causes the muscles to become more tense and can rarely relax properly.

In this way, the muscles (usually of the extremities) appear more rigid, shorten their range of motion, reduce the ability to turn.

Also, being always in tension is more likely to experience pain and cramps, and when the stiffness affects the muscles of the face is  reduced expressiveness.

  1. Postural instability

Finally, although this is the least obvious symptom of PE, it can be the most uncomfortable for the person who suffers it.

As Parkinson’s disease progresses, patients may adopt a stooped posture, which contributes to the imbalance.

This alteration can produce instability in the patient and, therefore, increases the risk of falling in normal situations such as getting out of  a chair, walking or crouching.

Non-motor symptoms

  1. Dementia

Between 20 and 60% of patients with PD end up presenting a demential syndrome due to Parkinson’s disease.

This is because the degeneration produced by this disease and that is reflected in the motor symptoms, also alters the functioning of  brain mechanisms related to the cognitive abilities of the person.

Dementia due to Parkinson’s disease is characterized by motor and cognitive leniency, dysfunction of the ability to execute, and deterioration  of evocation memory (ability to recover information stored in the brain).

One of the first presentations of dementia caused by EP are frontal alterations, especially a generalized slowing  of mental processes (bradyphinia) is connoted.

Likewise, in many cases it also highlights a notorious attention deficit and great difficulties to concentrate.

All this triggers a behavior characterized by the slowness of cognitive tasks and an increase in the time of information processing,  that is, patients with PD are less agile mentally and need more time to learn.

In more advanced stages there are visuoperceptive deficits (the ability to recognize stimuli decreases), and memory deficits, especially the  ability to learn and recall past events.

As regards language, it becomes more monotonous and slower, and problems in the articulation of words ( dysarthria ) can occur.

Finally, in advanced stages, temporary disorientation appears (not remembering the day, week, month or year in which one lives) and spatial (not knowing how to  orient oneself in the street). Personal orientation is normally preserved.

  1. Depression

Patients with PD often experience fluctuations in mood and, on many occasions, depression appears as a major symptom.

In fact, between 25% and 70% of patients with Parkinson’s disease present a depressive picture at some point.

This fact is explained because the dopaminergic system that degenerates PE is closely related to reward systems and therefore plays a fundamental role  in the establishment of mood.

In fact, when a person eats when he is hungry, drinks when he is thirsty or performs any pleasant activity there is a release of d opamina in the brain, which produces a sense of well-being and gratification.

Therefore, since PE produces a reduction of this substance in the brain, it is expected that patients with this disease have a greater  tendency to suffer from depression.

Depression caused by PE is characterized by high levels of dysphoria, pessimism and constant irritability, and experiencing anxiety.

However, thoughts of guilt, self-reproach and feelings of low self-esteem are very rare , symptoms that are often very  common in other types of depression.

The idea of ​​autolytic or suicidal is usually very present in the depressions of EP, while the consummated suicide is very rare. Rarely  delusions occur and when they do they are usually a side effect of the medication.

Likewise, the symptoms of depression in Parkinson’s disease contribute to the person having little motivation for things, further slow down  their movements and exacerbate their lack of concentration, the slowness of thinking and alterations in memory.

  1. Sleep disorders

The sleep disorders are a typical problem in Parkinson’s disease.

Its mechanisms of appearance are unknown but it seems that this type of disorder could be caused in part by Parkinson’s disease itself, and  partly by the antiparkinsonian treatment that these patients receive.

Insomnia and fragmentation of sleep often appear with frequent awakenings during the night.

The difficulty in initiating or maintaining sleep can be a primary disorder associated with PD itself. However, the fragmentation of sleep and  difficulties in maintaining sleep could be a side effect of the medication.

Another problem also common in PD is daytime sleepiness, and may appear, although more occasionally, very vivid dreams and nocturnal vocalizations  .

  1. Others

Apart from these symptoms, PD can present hallucinations and delusional ideas of jealousy or prejudice, and impulse control disorders such as  hypersexuality, gambling, compulsive shopping or binge eating.

Other less common presentations are pudding (performing a task or hobby in an addictive way) and dopaminergic dysregulation syndrome ( compulsively taking  antiparkinsonian mediation).

Likewise, on a physical level, PE can cause constipation, increased sweating, feeling dizzy, sexual dysfunction, urinary symptoms, loss  of smell, visual disturbances, fatigue, fatigue and pain.

Causes of Parkinson’s Disease

Currently the cause of Parkinson’s Disease is unknown, however, as with most neurodegenerative diseases, there is  some consensus in ruling that its appearance is due to the combination of genetic and environmental factors.

Regarding genetics, certain mutations have been discovered in different genes that seem to be associated with having a greater susceptibility to  develop Parkinson’s Disease. Between 15 and 25% of patients have a family member with PD.

However, it seems that the genetic component only predisposes the person to develop the neurodegenerative disease and not to develop it.

Therefore, it is believed that certain environmental components also seem to be associated with PE and can act as risk factors. These are:

  1. Aging:  Age has been shown to be a clear risk factor for PE. The possibility of suffering from the disease increases markedly after 60 

  2. Male gender:  men suffer more PE than women, so this could be another risk factor for the disease.

  3. Cranial injury: they  have connoted numerous cases of PD among boxers, which seem to keep a clear relationship between trauma and strokes suffered in 
    the brain area with the development of the disease.

  4. Exposure to pesticides:  These toxic chemicals can produce Parkinson’s symptoms, which is a very high risk factor for PD.


Parkinson’s disease has no cure but it can be effectively controlled through the following interventions, evidently under the supervision  of a medical professional:

Also Read: Senile Dementia: Symptoms, Causes and Treatments

  1. Antiparkinsonian drugs:  act on the nervous system to increase or replace dopamine. Slightdopa is the most effective for treating PE and allows control of motor symptoms  .

  2. Deep brain stimulation (ECP): it  is a surgical treatment that can reduce some symptoms of PD. It is done by electrodes that administer electrical stimulation in  the brain. It should be done only in advanced stages.

  3. Cognitive stimulation:  perform exercises that work on the patient’s cognitive functions (memory, attention, executive functions, etc.). they will prevent the onset of
    dementia and diminish the advance of cognitive deterioration.

  4. Exercise and physiotherapy: a  fundamental part of the rehabilitative treatment of PD, will allow to attenuate motor symptoms and slow movements.

  5. Occupational therapy:  allows the patient to retain their functionality, remain autonomous, learn to live with their Parkinsonian symptoms and can enjoy more of their leisure activities.

  6. Psychotherapy:  to treat possible symptoms of depression, apathy, agitation or anxiety that produces PD.