Overview
Parkinson's disease is a progressive disorder of the brain and nervous system. It happens when certain brain cells that help produce dopamine are lost, making movement harder to control. Symptoms often begin gradually and may start on one side of the body. Parkinson's can also affect sleep, mood, speech, swallowing, and bowel or bladder function.
Key Symptoms
Common symptoms include tremor when the body part is at rest, slowed movement, muscle stiffness, and trouble with balance or walking. A person may have a softer voice, smaller handwriting, reduced facial expression, or less arm swing when walking. Non-movement symptoms can include constipation, loss of smell, sleep problems, depression, anxiety, and changes in thinking. Not everyone has the same symptoms, and symptoms can progress at different speeds.
Causes and Risk Factors
The exact cause is not fully understood, and in many people it likely involves a mix of aging, genetic factors, and environmental exposures. Risk increases with older age, and Parkinson's is more common in men than in women. A small number of cases are linked more strongly to inherited gene changes. Having risk factors does not mean a person will definitely develop the disease.
Who Is Affected
Parkinson's disease is more common in older adults, but some people develop it before age 50. It occurs in many countries and populations around the world. Family history may raise risk for some people, but many people with Parkinson's have no known family history. The condition affects both movement and daily life, so it can also affect family members and caregivers.
Diagnosis and Tests
Diagnosis is usually based on medical history, symptoms, and a neurological examination. A healthcare professional may look at movement, balance, muscle tone, walking, and how symptoms change over time. There is no single blood test or scan that diagnoses Parkinson's disease for everyone. Tests may be used to support the evaluation or to rule out other causes of similar symptoms.
Treatment Categories
Treatment often includes medicines that help with movement symptoms, along with physical, occupational, or speech therapy. Some people may be evaluated for device-based treatments such as deep brain stimulation when symptoms become harder to manage. Care may also address sleep, mood, constipation, pain, and swallowing problems. Treatment plans are individualized and usually need regular review as symptoms change.
Living With It
Living with Parkinson's disease often means adjusting routines over time to support mobility, safety, and communication. Support from family, caregivers, rehabilitation professionals, and community services can be important. Tracking symptoms, falls, sleep problems, and medicine effects can help with follow-up visits. Emotional health matters too, because depression, anxiety, and stress can affect quality of life.
Diet and Lifestyle
Regular physical activity can help support mobility, balance, strength, and daily function. Eating a balanced diet with enough fluids and fiber may help with constipation, which is common in Parkinson's disease. Home safety changes, such as reducing trip hazards and improving lighting, may lower fall risk. A healthcare professional can advise on exercise, swallowing concerns, and other daily living needs.
When to Seek Medical Care
See a healthcare professional if you notice ongoing tremor, slowness, stiffness, balance problems, or changes in walking. Medical advice is also important for repeated falls, swallowing trouble, weight loss, hallucinations, major sleep problems, or changes in mood or thinking. Early evaluation can help identify the cause of symptoms and support planning for treatment and daily life.
When It May Be an Emergency
Get urgent medical help for sudden severe confusion, chest pain, trouble breathing, a serious fall or head injury, or sudden inability to move. Emergency care is also needed for choking, new weakness on one side, sudden facial droop, or trouble speaking because these can signal another urgent condition such as stroke. Severe dehydration, high fever, or a sudden major change after a medication change also needs prompt medical attention.