Alzheimer’s disease, also known as Alzheimer’s disease, and Parkinson’s disease are both neurodegenerative diseases of old age, and the differences are as follows: 1. Parkinson’s disease: motor slowing, tremor, and abnormal postural movements are the main manifestations, and after the middle and late stages, cognitive function can be affected, and cognitive decompensation can also occur at a later stage; 2. Alzheimer’s disease: memory loss occurs at the beginning, and there may also be a slowing of movement, but there is usually no increased muscle tone. Its may be manifested in a reduced ability to judge things around, and in severe cases even go out and cannot find their home, and some do not recognize their family members and relatives, and sometimes may be manifested in not being able to remember some things in the past. In the later stages, speech is reduced, rarely speaks, or even is silent, unlike Parkinson’s disease.