Memory loss can occur in Parkinson's disease and multiple sclerosis (MS) due to neurodegenerative changes affecting the brain. In Parkinson's, memory impairment often manifests in later stages, alongside movement symptoms. MS-related memory loss can result from lesions in the brain's white matter affecting cognitive function. Symptoms may include forgetfulness, difficulty with concentration, and impaired executive function. Diagnosis involves neurological assessments, imaging tests, and cognitive evaluations. Treatment focuses on managing underlying conditions, medications to alleviate symptoms, and rehabilitation therapy to improve cognitive function. Supportive strategies, such as memory aids and cognitive exercises, can help manage memory loss and improve quality of life.