One possibility is that purring is a way for cats to comfort themselves. Another possibility is that this is a way for cats to let their owners know they need support. Purring might also be a reflexive response to a cat’s physical state.
Some cats may become more affectionate and clingier with their loved ones, while others may become more distant and aloof. It is also common for cats to seek out a quiet place to die, such as under a bed or in a closet.
It is important for you to provide your cat with love, comfort, and any necessary medical care. If you have any concerns about your cat’s health or behavior, it is always a good idea to consult with a veterinarian or palliative care.