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The numbness in the leg may be due to many causes, such as damage, irritation or compression of several nerves or a single branch of a nerve. It may also be caused by certain conditions affecting the peripheral nerves, such as diabetes.
It may also be caused by certain conditions which may cause both dementia and numbness such as amyloidosis. Therefore you need to know the cause for your dementia.
Also liver problems may cause vitamin deficiencies leading to numbness. Hence this new symptom may be related to your previous conditions, but further testing may be required.
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