Parkinson's Disease Stages: Symptoms & Treatment Options

How are the 5 Parkinson's disease stages determined?

Clinicians use two primary tools to measure Parkinson’s disease severity and progression:

The Hoehn and Yahr Scale

Developed in 1967, the Hoehn and Yahr scale is the most commonly used staging system for Parkinson’s disease. It classifies patients into five stages based on the degree of motor impairment and functional disability. Stage 1 reflects minimal, one-sided symptoms, with Stage 5 reflecting full dependence on a caregiver. Scores in between capture the gradual spread of symptoms to both sides of the body and the onset of balance and gait problems.

The MDS-UPDRS

The Movement Disorder Society Unified Parkinson’s Disease Rating Scale (MDS-UPDRS) is a more detailed, four-part assessment used by neurologists and neurosurgeons to track changes over time and evaluate treatment response. It covers non-motor symptoms, motor symptoms, activities of daily living, and motor complications from medication. While your provider may not discuss your MDS-UPDRS scores with you, they often use it to guide treatment decisions, such as whether and when deep brain stimulation is appropriate.

The 5 Stages of Parkinson’s Disease

The five stages of Parkinson’s Disease reflect the Hoehn and Yahr scale. Progression between stages is highly individual. You may remain in early stages for many years, while others advance more quickly. This variability is one reason that ongoing evaluation by a movement disorder specialist is so important.

What is Stage 1 of Parkinson's disease?

In Stage 1, symptoms are present but mild, and they affect only one side of the body. Most people can still perform all daily activities independently. Because symptoms are subtle at this stage, Parkinson’s often goes undiagnosed at this stage, or it is mistaken for another condition, such as essential tremor.

Motor symptoms:

• Slight tremor, typically in one hand or arm
• Mild rigidity or stiffness on one side
• Minor changes to posture, walking, or facial expression

Non-motor symptoms:

• Changes in sleep, including vivid dreams or REM sleep behavior disorder (an early warning sign for many patients)
• Loss of sense of smell (anosmia)
• Constipation and other digestive changes
• Subtle mood changes, including mild depression or anxiety

What is Stage 2 of Parkinson's disease?

At Stage 2, symptoms begin affecting both sides of the body, though balance is not yet significantly impaired. Daily tasks may take longer and require more effort, but most patients can still live independently.

Motor symptoms:

• Tremor, rigidity, or slowness of movement (bradykinesia) on both sides
• Changes in posture — slight forward lean
• Reduced arm swing while walking
• Softer voice (hypophonia) and reduced facial expression (hypomimia)
• Handwriting may become smaller (micrographia)

Non-motor symptoms:

• Fatigue and reduced energy
• Sleep disturbances worsen
• Depression and anxiety become more common
• Cognitive slowing may begin subtly
• Drooling, swallowing changes

Treatment at Stage 2:

Patients usually start medications (typically levodopa/carbidopa or a dopamine agonist) at Stage 2. Physical, occupational, and speech therapy become increasingly important. DBS is not typically performed at this stage, but this is an excellent time to establish a relationship with a top-ranked DBS center, such as Neurosurgery One’s Denver DBS Center, for future planning.

Patients are eligible for DBS if they have:

• Experienced symptoms for 4 years or longer
• Tried medications for 4 months without desired improvement

What is Stage 3 of Parkinson's disease?

Stage 3 is a significant transition point. Symptoms are now clearly affecting both sides of the body and your balance is likely to be impaired, which increases the risk of falls. Most patients can still live independently, but they may need assistance with some daily tasks.

Motor symptoms:

• Balance problems and increased fall risk
• Slowed reflexes
• Difficulty with fine motor tasks (buttoning, writing, eating)
• Gait changes — shuffling, shortened stride, freezing of gait
• Tremor and rigidity more pronounced

Non-motor symptoms:

• Cognitive changes — difficulty with multitasking, memory, and focus
• Increased anxiety, depression, or apathy
• Bladder and bowel urgency
• Pain, often in the shoulder, back, or legs related to rigidity
• Medication “off” periods become more common as levodopa wears off faster

Treatment at Stage 3:

Medication regimens typically become more complex at this stage, and many patients begin experiencing “on-off” fluctuations — periods when medication is working well versus times when symptoms break through. If you are noticing increasing “off” time or medication side effects like dyskinesia (involuntary movements), this is an important time to discuss Deep Brain Stimulation with your neurologist and neurosurgeon. Stage 3 patients who still have a good response to levodopa are often excellent DBS candidates.

What is Stage 4 of Parkinson's disease?

Stage 4 is characterized by severe symptoms that significantly limit independence. Standing without assistance may be possible, but walking is challenging and falls are a serious concern. Most patients at this stage require help with daily activities.

Motor symptoms:

• Very limited ability to live alone safely
• Standing possible but walking requires support
• Significant freezing episodes
• Pronounced rigidity and bradykinesia

Non-motor symptoms:

• More significant cognitive impairment, such as memory loss and confusion
• Hallucinations or delusions (often related to high-dose medication)
• Severe depression or anxiety
• Autonomic dysfunction, such as blood pressure changes, constipation, urinary issues
• Moderate to severe sleep disruption

Treatment at Stage 4:

DBS can still be effective for appropriate Stage 4 patients, particularly for controlling motor symptoms like tremor and rigidity that continue to respond to levodopa. However, DBS does not treat cognitive decline or other non-motor symptoms.

Some neurologists may only bring up DBS at this stage, but we we encourage patients to obtain an evaluation as soon as they have experienced symptoms for four years — even if symptoms are still minor and controlled by medication so that you and your provider team can select the optimal time for you to get the most benefit for the longest amount of time from DBS.

Waiting until Stage 4 may mean some symptoms are no longer DBS-responsive. For those who are candidates, however, DBS at this stage can still meaningfully improve motor function and reduce medication load.

What is Stage 5 of Parkinson's Disease?

Stage 5 is the most advanced stage of Parkinson’s disease. Patients are typically wheelchair-bound or bedridden and require full-time nursing care. The focus of treatment shifts toward comfort, symptom management and quality of life.

Motor symptoms:

• Inability to stand or walk without full assistance
• Severe freezing, falls
• Swallowing difficulties that may require modified diet or feeding assistance

Non-motor symptoms:

• Dementia is present in many patients
• Psychosis, hallucinations
• Severe autonomic dysfunction
• Pain management becomes a primary concern

Treatment at Stage 5:

The goals of care at Stage 5 center on comfort and dignity. Palliative care coordination is important. DBS surgery is generally not performed at Stage 5, which underscores the importance of an evaluation when motor skill fluctuations begin.

Non-Motor Symptoms: What Many Patients Don’t Expect

Parkinson’s is widely known as a movement disorder, causing well-known symptoms such as rigidity and slow movements. But non-motor symptoms often have an equal or greater impact on quality of life, including:

• Cognitive changes, ranging from mild memory loss or decline in problem-solving skills to dementia
• Depression and anxiety, which affects up to half of people with Parkinson’s disease
• Apathy and loss of motivation
• Sleep disorders affect up to 75% of patients; these can include difficulty falling asleep, daytime sleepiness, restless legs and REM behavior disorder (acting out dreams)
• Autonomic dysfunction, including blood pressure fluctuations, constipation, urinary urgency and sexual dysfunction
• Pain and sensory disturbances
• Fatigue
• Psychosis and hallucinations (particularly in later stages, often medication-related)

Non-motor symptoms do not respond to DBS. This is another reason why DBS evaluation should not be delayed until the disease has progressed very far. Undergoing DBS to address motor symptoms as early as possible, when non-motor symptoms are not very pronounced, leads to the best long-term outcomes and gives you the highest quality of life for the longest period possible.

How long does each stage of Parkinson's last?

One of the most common questions patients and families ask is: How quickly will my Parkinson’s progress? The answer is different for every patient and influenced by personal factors including age at diagnosis, genetic factors, overall health and adherence to treatment.

In general terms:

• Early-stage Parkinson’s (Stages 1 and 2) can last many years, sometimes a decade or more, particularly in patients who are younger at onset and who engage actively in exercise and treatment.
• The transition from Stage 2 to Stage 3 typically occurs 3 to 7 years after initial symptoms and diagnosis. This stage is marked by the onset of balance problems.
• Stages 4 and 5 represent advanced disease that may develop 10 to 20 years after initial diagnosis, though this varies significantly.

Research has shown that patients who receive DBS earlier in their disease course — before significant disability accumulates — tend to maintain a better quality of life for longer. Waiting until symptoms are “their worst” before considering DBS is a common mistake that can limit how much the procedure can help.

What are the treatments for each stage of Parkinson's Disease?

There are three categories of treatment. All patients will require medication and various forms of therapy, with some choosing to be treated with deep brain stimulation.

Medication

Levodopa combined with carbidopa remains the gold standard medication for Parkinson’s disease and is the most effective treatment for motor symptoms. Dopamine agonists, MAO-B inhibitors, and other agents are used alone or in combination depending on the stage. Over time, many patients find that the effectiveness of medication fluctuates (the “on-off” phenomenon) or that higher doses are needed, increasing the risk of dyskinesia (involuntary movements).

Physical, Occupational and Speech Therapy

Exercise is one of the most powerful tools available for slowing Parkinson’s progression. Structured physical therapy, balance training, occupational therapy for fine motor skills and daily living challenges, and speech therapy (particularly the LSVT LOUD program) all play important roles across all stages. These therapies are most beneficial when started early and continued consistently. At Neurosurgery One, we are a part of an expert team at AdventHealth Littleton hospital that includes comprehensive therapies for patients with Parkinson’s disease, including LSVT LOUD.

Deep Brain Stimulation (DBS)

Deep Brain Stimulation is a surgical procedure in which a small device — similar to a cardiac pacemaker — delivers precise electrical impulses to targeted areas of the brain that control movement. DBS does not cure Parkinson’s disease, but it can dramatically improve motor symptoms and quality of life, and it can extend lifespan.

Key benefits of DBS for Parkinson’s disease include:

• Up to 80% improvement in motor symptoms for appropriate candidates
• Significant reduction in “off” time when medication isn’t working effectively
• DBS combined with medications can nearly double the daily hours of good symptom control
• Reduction in dyskinesia by allowing medication doses to be lowered
• Reduction in tremor even when medications have not been effective
• Nearly 50% average reduction in medication requirements
• Research indicates DBS can extend lifespan in Parkinson’s patients

At the Denver DBS Center, our neurosurgeons perform approximately 50 DBS procedures each year with complication rates well below the national average. We offer both Asleep DBS (performed while the patient is fully sedated using real-time CT imaging for precision) and traditional Awake DBS, and we work closely with your neurologist and primary care provider to ensure DBS is right for you before proceeding.

Is there a cure for Parkinson's disease?

There is no cure for Parkinson’s disease, although treatment can help control symptoms so that you can live with the disease. There are a wide variety of surgical and non-surgical treatment options for improving your quality of life. The goals of treatment are to relieve physical disabilities and balance symptom control with medication side effects.

When should I consider DBS for Parkinson's?

Deep brain stimulation (DBS) is surgery to implant a small device, similar to a heart pacemaker, that controls electrical impulses sent to the brain to disrupt the activity causing your seizures.  DBS offers many benefits for people with Parkinson’s disease, including fewer tremors to more “on time” to reduced medications. First approved by the FDA for Parkinson’s disease in 2002, DBS is effective in early stages of Parkinson’s disease and may extend your life. While every Parkinson’s patient must be evaluated to determine if DBS  is right for you, below are general criteria:

• Clear diagnosis of idiopathic (arising spontaneously) Parkinson’s disease
• Absence of dementia
• Any fluctuations in symptoms with levodopa therapy (Parcopa, Sinemet, Stalevo)
• At least some improvement with levodopa therapy
• Lack of serious disease that would prevent surgery
• No age parameters, but patients under 75 generally do better

New research shows that undergoing DBS in the earlier stages of Parkinson’s disease is effective, contrary to earlier recommendations that patients must have the disease for at least seven years to benefit. The study also found DBS to be more effective than medications in controlling tremors in patients with Parkinson’s disease.

What are the benefits of DBS for Parkinson's?

DBS for Parkinson’s disease offers a multitude of benefits, from increased control to reduced medication. New research published by the Journal of Neurology, Neurosurgery and Psychiatry that DBS may prolong life for Parkinson’s patients.

Benefits of DBS for patients with Parkinson’s may include:

• DBS plus medications can nearly double the number of “on” hours without dyskinesia each day.
• DBS can alleviate tremor, even if medications do not. Patients who have undergone the procedure have reported up to 80% symptom improvement.
• DBS reduces dyskinesia by reducing medications.
• DBS is more effective than medications in controlling tremors in patients with Parkinson’s disease.
• DBS results in a nearly 50% average reduction in medication compared to medical therapy alone.
• The initial cost of DBS is offset by savings in medications by patients with Parkinson’s disease in less than two years after the procedure.
• Improvement in all motor symptoms—rigidity, tremor, facial expression, freezing—leads to improvements in quality of life, bodily discomfort and emotional well-being.
• DBS may extend life for Parkinson’s patients.

Am I a candidate for DBS?

Every patient is different, and the decision to pursue DBS involves a careful evaluation by a neurologist, neurosurgeon, and a neuropsychologist. At Neurosurgery One’s Denver DBS Center, we offer consultations for patients with Parkinson’s disease at any stage who would like to learn more about DBS and when it might be appropriate for them.

The evaluation process is thorough and individualized. We will never recommend DBS unless we are confident it represents the best path forward for you specifically.

If you’re not quite ready for a clinical consult but have questions, our DBS Nurse Navigator is available for free informational phone sessions.

Living Well with Parkinson's Disease

A Parkinson’s diagnosis is life-changing. However, many patients live well for years and even decades after being diagnosed. The keys are engaging early in understanding your disease, building your care team, and discussing all available treatment options — including DBS — before the window for maximum benefit passes.

At Neurosurgery One, we treat the whole patient, not just the symptoms. Our team works alongside your neurologist to provide the most advanced DBS care available in the Denver area. We are honored to serve patients from throughout Colorado, Wyoming, Kansas, Nebraska, New Mexico and beyond.