It isn’t surprising that people with dementia feel anxious sometimes. The world has become more difficult for them to navigate, and they are unsure of so many things. Maintaining a regular routine can help make days more manageable. Consistency in care givers and approaches is important. Anticipating their needs can help keep anxiety from creeping in.
Some other things to try: play quiet music that they enjoy, encourage a balance of exercise and rest, aromatherapy, soothing lotions, tea, “comfort foods”, or a weighted blanket. Stress balls, rosaries or other items that can be held and manipulated might also help. Physical exercise, such as walking or rocking in a chair can also help “work off” some tension.