Degenerative diseases are conditions that cause the gradual deterioration of cells, tissues, or organs over time. These diseases often lead to a decline in physical function and can affect various systems in the body. Common examples include Alzheimer's disease, Parkinson's disease, and osteoarthritis. The exact causes of degenerative diseases can vary, but they often involve a combination of genetic, environmental, and lifestyle factors. While there is currently no cure for many of these conditions, treatments may help manage symptoms and improve quality of life for those affected.