It can be hard to tell if you have Parkinson's disease.

Here are the 10 signs you might have the disease. No single one of these signs means that you shouldworry. But if you have morethan one symptom you should make an appointment to talk to yourdoctor.

Have you noticed a slight shaking or tremor in your finger, thumb, hand, chin or lip? Does your leg shake when you sit down or relax? Twitching or shaking of limbs is a common early sign of Parkinson's disease.

Shaking can be normal after lots of exercise or if you have been injured. Shaking could also be caused by a medicine you take.

Has your handwriting suddenly gotten much smaller than in it was in the past? You may notice the way you write words on a page has changed, such as letter sizes are smaller and the words are crowded together. A sudden change in handwriting is often a sign of Parkinson's disease.

Sometimes writing can change as you get older, if you have stiff hands or fingers or poor vision, but this happens over time and not suddenly.

Have you noticed you no longer smell certain foods very well? If you seem to have more trouble smelling foods like bananas, dill pickles or licorice, you should ask your doctor about Parkinson's disease.

Your sense of smell can be changed by a cold, flu or a stuffy nose, but it should come back after you are better.

Do you thrash around in bed or kick and punch while you are deeply asleep? You might notice that you started falling out of bed while asleep. Sometimes, your spouse will notice, or will want to move to another bed. Sudden movements during sleep may be a sign of Parkinson's disease.

It is normal for everyone to have a night when they 'toss and turn' instead of sleeping.

Do you feel stiff in your body, arms or legs? Sometimes stiffness goes away as you move. If it does not, it can be a sign of Parkinson's disease. You might notice that your arms don't swing when you walk, or maybe other people have said you look stiff. An early sign might be stiffness or pain in your shoulder or hips. People sometimes say their feet seem 'stuck to the floor.'

If you have injured your arm or shoulder, you may not be able to use it as well until it is healed, or another illness like arthritis might cause the same symptom.

Do you have trouble moving your bowels without straining every day? Straining to move your bowels can be an early sign of Parkinson's disease and you should talk to your doctor.

If you do not have enough water or fiber in your body, it can cause problems in the bathroom. Alsosome medicine will cause constipation. If there is no other reason such as diet or medicine that would cause you to have trouble moving your bowels, you should speak with your doctor.

Have other people told you that your voice is very soft when you speak in a normal tone, or that you sound hoarse? If there has been a change in your voice you should see your doctor about whether it could be Parkinson's disease. Sometimes you might think other people are losing their hearing, when really you are speaking more softly.

A chest cold or other virus can cause your voice to sound different, but you should go back to sounding the same when you get over your cough or cold.

Have you been told that you have a serious, depressed or mad look on your face more often, even when you are not in a bad mood? This serious-looking face is called masking. Also, if you or other people notice that you have a blank stare or do not blink your eyes very often, you should ask your doctor about Parkinson's disease.

Some medicines can cause you to have the same type of serious or staring look, but you would go back to the way you were after you stopped the medication.

Do you notice that you often feel dizzy when you stand up out of a chair? Feeling dizzy or fainting can be signs of low blood pressure and can be linked to Parkinson's disease.

Everyone has had a time when they stood up and felt dizzy, but if it happens on a regular basis you should see your doctor.

Are you not standing up as straight as you used to? If you or your family or friends notice that you seem to be stooping, leaning or slouching when you stand, it could be a sign of Parkinson's disease.

If you have pain from an injury or if you are sick, it might cause you to stand crookedly. Also, a problem with your bones can make you hunch over.

For more information, visit our Treatment page.

Watch and share this public service announcement featuring U.S. Senator Cory Booker that discusses the early warning signs of Parkinson's disease.

Made possible through the generous support of the Medtronic Foundation and thousands of people with Parkinson's and their families.

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