The details of Gene Hackman’s final days may never be known. But officials in Santa Fe, N.M., said on Friday that it appeared that Mr. Hackman, who had advanced Alzheimer’s as well as heart disease, had spent about a week alone after his wife, who was his caregiver, died at home of a rare viral infection.

Mr. Hackman, 95, may have been among the most famous movie stars of the 20th century, but his circumstances point toward a common challenge, according to experts in dementia and family caregiving. Like Mr. Hackman, about seven million Americans have Alzheimer’s, a type of dementia, and their family members, like his wife, Betsy Arakawa, 65, often help care for them as the disease progresses.

Laura N. Gitlin, a behavioral scientist at Drexel University who researches ways to support caregivers, said that when a patient is diagnosed with dementia, their loved ones rarely receive all the information they need.

“No one really explains to the family what the course of the disease may look like, how to prepare,” she said. “No one checks in on the caregiver.”

Knowing how to prepare for this situation can help improve the quality of life for not only patients, as they adjust to life with the disease, but also those who become devoted to their needs. Here are five tips to consider if you become a caregiver for a loved one with dementia.

Stay social.

People with dementia may feel uncomfortable or anxious around faces they don’t recognize, and stigma can lead some families to retreat from social life. But becoming reclusive can worsen the disease, said Dr. Helen Kales, a geriatric psychiatrist at the University of California, Davis. Isolation can accelerate cognitive decline and even puts caregivers at a higher risk for developing dementia themselves.