Elena Altemus is 89 and has dementia. She often forgets her children’s names, and sometimes can’t recall whether she lives in Maryland or Italy.

Yet Elena, who entered a nursing home in November, was screened for breast cancer as recently as this summer. “If the screening is not too invasive, why not?” asked her daughter, Dorothy Altemus. “I want her to have the best quality of life possible.”

But a growing chorus of geriatricians, cancer specialists and health system analysts are coming forth with a host of reasons: Such testing in the nation’s oldest patients is highly unlikely to detect lethal disease, hugely expensive, and more likely to harm than help, since any follow-up testing and treatment is often invasive.

And yet such screening—some have labeled it “overdiagnosis”—is epidemic in the United States, the result of medical culture, aggressive awareness campaigns, and financial incentives to doctors.

By looking for cancers in people who are unlikely to benefit, “we find something that wasn’t going to hurt the patient, and then we hurt the patient,” said Dr. Sei Lee, an associate professor of geriatrics at the University of California–San Francisco.

Among people in their 70s and 80s, cancer screenings often detect slow-growing tumors that are unlikely to cause problems in patients’ lifetimes. These patients often die of something else—dementia or heart disease or pneumonia—long before their cancers would ever have become a threat, said Dr. Deborah Korenstein, chief of general internal medicine at New York’s Memorial Sloan Kettering Cancer Center. Prostate cancers, in particular, are often harmless.

“It generally takes about 10 years to see benefit from cancer screening, at least in terms of a mortality benefit,” Korenstein said.

Even some patients with terminal cancers continue to be screened for other malignancies.

Although screenings can extend and improve lives for healthy, younger adults, they tend to inflict more harm than good in people who are old and frail, Korenstein said.

Dr. Cary Gross, a professor at the Yale School of Medicine, agreed. “In patients well into their 80s, with other chronic conditions, it’s highly unlikely that they will receive any benefit from screening, and more likely that the harms will outweigh the benefits,” he said.

“Overdiagnosis is serious,” Gross said. “It’s a tremendous harm that screening has imposed. ... It’s something we’re only beginning to reckon with.”

Taxpayers usually foot the bill for these tests, because most seniors are covered by Medicare.

“It’s jarring for someone who’s been told every year to get screened and then at age 75, you tell them to stop,” she said.

John Randall, 78, says he plans to live into his 90s. He sees no reason to skip cancer screening.

“I don’t like to hear what my life expectancy is,” said Randall, who lives near Madison, Wis. He plans to have his next colonoscopy in January. He feels healthy and walks two miles at a stretch several days a week. “No one knows when I am going to die.”

Colonoscopies, which require extensive bowel cleansing before the procedure, also can leave many older people dehydrated and prone to fainting.

Even removing nonfatal skin cancers can cause problems for older patients, said Dr. Eleni Linos, an associate professor at the University of California–San Francisco School of Medicine. Frail patients can struggle to care for surgical wounds and change dressings; their wounds are also less likely to heal well. More than 1 in 4 patients with nonfatal skin cancers report a complication of treatment, Linos’ research shows.

“For a woman of that generation who doesn’t have the cognitive ability to understand what’s going on, having private parts of their body exposed and pressed against a machine can be very agitating and upsetting,” Lee said.

Among older women, about 70 percent report significant stress at the time of a biopsy, Schonberg said.

Virtually all older women with breast cancer wind up getting surgery, which poses additional hardships. Many are prescribed hormonal therapies that can cause bone pain and fatigue, and increase the risk of stroke.

Jay Schleifer, 74, of Wellington, Fla., was diagnosed with a low-risk prostate cancer last year. Since then, his doctor has monitored him with additional tests. He’ll be treated only if tests suggest his cancer has become more aggressive.

This less aggressive approach aims to spare Schleifer from long-term side effects.

“It’s a lot easier to say, ‘Fine, get your regular mammogram this year,’ than to have the much more difficult conversation that it’s not helpful when life expectancy is limited,” Gross said.

Schonberg said she tries to be diplomatic when talking to patients about halting screening.

“It’s hard to tell people, ‘You’re not going to live long enough to benefit,’” Schonberg said. “That doesn’t go over well.”

Many physicians continue screening older people because they’re afraid they’ll be sued if they miss a cancer, Schonberg said. And she notes that some health systems award bonuses to clinicians whose patients have high screening rates.

Doctors should prioritize what they can do to help patients be healthier, said Dr. Louise Walter, chief of geriatrics at the University of California–San Francisco and a geriatrician at the San Francisco VA Medical Center. For many older patients, screening for cancer is not their most pressing need.

“Instead of spending time and effort on things that are hurtful and never going to help them, why not direct time and energy on things that will help them live longer and better?” Walter asked.

For example, Walter might tell a patient, “Right now, you have really bad heart failure and we need to get that under control,” he said.

Other key issues for many older people include preventing falls, treating depression, and alleviating stress in their caregivers, Walter said. Gross said he urges patients to take steps shown to improve their health, such as exercising at least 15 minutes a day.

“These are things that can help them feel better very quickly,” Walter said. “Screenings can take years to have a benefit, if at all.”