Parkinson’s disease is a progressive movement disorder that affects the nervous system, which controls body movement and coordination. Symptoms usually develop slowly and worsen over time. One of the earliest signs is often a mild tremor, commonly starting in one hand, foot, or the jaw. As the condition progresses, people may experience stiffness, slowed movement, balance problems, and an increased risk of falls. Facial expression may become reduced, arm swing while walking may decrease, and speech can become soft or slurred.
Symptoms
Symptoms vary from person to person and typically begin on one side of the body before spreading to both sides. Common motor symptoms include tremor, slowed movement (bradykinesia), rigid muscles, poor posture and balance, changes in speech, and difficulty with writing. In addition to movement-related problems, Parkinson’s disease also causes nonmotor symptoms such as depression, anxiety, sleep disorders, constipation, fatigue, urinary problems, loss of smell, and difficulties with thinking and memory.
Causes
The disease is caused by the gradual loss of nerve cells (neurons) in the brain that produce dopamine, a chemical messenger essential for smooth and controlled movement. Reduced dopamine leads to abnormal brain activity and the movement problems seen in Parkinson’s disease. Another chemical messenger, norepinephrine, which helps regulate blood pressure and other body functions, is also reduced. Although the exact cause is unknown, genetic factors, environmental exposures such as pesticides or toxins, and changes in brain structures—such as the presence of Lewy bodies and abnormal alpha-synuclein protein—are believed to play a role.
Several risk factors increase the likelihood of developing Parkinson’s disease. These include advancing age, being male, having close family members with the condition, and long-term exposure to certain toxins. While Parkinson’s disease cannot be cured, treatments such as medications can significantly improve symptoms. In some cases, surgery that targets specific areas of the brain may help reduce symptoms and improve quality of life.
Parkinson’s disease can lead to complications, especially in later stages. These include problems with thinking and dementia, emotional changes, depression, difficulty swallowing and chewing, sleep disorders, bladder issues, constipation, blood pressure changes, pain, and sexual dysfunction. There is no proven way to prevent Parkinson’s disease, but research suggests that regular exercise, caffeine consumption, and some medications may lower the risk, though these findings are not yet conclusive.
