Symptoms

Parkinson's disease (PD) symptoms often start with tremor, which may occur in the following ways:

• Tremors may first be only occasional, starting in one finger and spreading over time to involve the whole arm. The tremor is often rhythmic, 4 to 5 cycles per second, and frequently causes an action of the thumb and fingers known as pill rolling.
• Tremors can occur when the limb is at rest or when it is held up in a stiff unsupported position. They usually disappear briefly during movement and do not occur during sleep.
• Tremors can also eventually occur in the head, lips, tongue, and feet. Symptoms can occur on one or both sides of the body. In one study, 44% of patients reported experiencing internal tremors lasting less than half an hour, but occurring several times a week.

In younger patients tremor is usually predominant and often suggests a less aggressive form of the disease. Some evidence suggests that tremor in PD may occur from mechanisms in the brain that are different from those that cause other PD symptoms.

Motion and Motor Impairment

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A number of PD symptoms involve motor impairment caused by the abnormalities in the brain that regulate movement:

• Slowness of motion (bradykinesia) is one of the classic symptoms of Parkinson's disease. Patients may eventually develop a stooped posture and a slow, shuffling walk. The gait can be erratic and unsteady. After a number of years, muscles may freeze up or stall, usually when a patient is making a turn or passing through narrow spaces, such as a doorway.
• Intestinal motility (the ability to swallow, digest, and eliminate) may slow down, causing eating problems and constipation.
• Muscles may become rigid (akinesia). This symptom often begins in the legs and neck. Muscle rigidity in the face can produce a mask-like, staring appearance.
• Motor abnormalities that limit action in the hand may develop in late stages. Handwriting, for instance, often becomes diminutive.
• Normally spontaneous muscle movements, such as blinking, may need to be done consciously.

Other Symptoms of Parkinson's Disease