Decline can seem faster when the person has infections, dehydration, poor nutrition, poor sleep, depression, pain, or medication problems. Sudden changes in routine, hospital stays, social isolation, and lack of activity can also make symptoms worse. Some people decline more quickly after a stroke or other major illness. Treating medical issues promptly and keeping the person calm, hydrated, and engaged can help reduce avoidable setbacks. Even small changes in health or environment can have a bigger effect than people expect, so new symptoms should always be checked.