By the time the undocumented mother of three walked into the UCSF emergency room, Dr. Rupa Marya knew it was too late. Breast cancer had metastasized throughout her body.

She had felt a lump in her breast eight months earlier, but because of her immigration status, the woman decided not to go to a hospital until the symptoms were unbearable. She died days later.

“To me, it’s un-American,” Marya said Sunday, standing among a throng of doctors and medical professionals protesting the Trump administration’s immigration policies. “It makes me feel so sad for the state we are in in this country, for people living in such fear.”

Standing beside Marya, on the sidewalk in front of the U.S. Office of Immigration and Customs Enforcement building on Sansome Street in San Francisco, the doctor’s 5-year-old son, Bija, held a handmade sign, scribbled in pen: “No Camps Free.” A couple hundred others, many doctors and medical professionals in long white coats and scrubs, stood outside the building and called for the closure of immigration camps and protection of immigrant rights.

The protest was part of the Month of Momentum: 30 Days of Action to Close the Camps, featuring a different protest each day this month at the ICE facility, led by a variety of groups.

Sunday brought an array of health professionals who shared medical concerns. Many held signs saying, “Close the Camps,” “We Are All Immigrants” and “Families Belong Together.”

“This is really harmful to individuals, but also to families and full communities,” said Amber Akemi Piatt, an organizer with the Public Health Justice Collective. “We see mental health trauma from being separated from their caretakers.”

Speaking to the crowd through a bullhorn, Fabian Fernandez, a doctoral student in medical anthropology, reminded protesters that federal officials are not giving flu shots to detainees in the detention camps as the influenza season begins. The crowd shouted, “Shame! Shame! Shame!”

Doctors have called on Customs and Border Protection officials to investigate the health conditions at the facilities after three children died from the flu while they were detained.

Akemi Piatt, who is fourth-generation Japanese American, said the controversial camps have brought back family memories. Her great-grandparents, grandmother, aunts and uncles were held during World War II in Camp Amache, a Japanese internment camp in Colorado.

“What is happening now will impact those families for generations,” she said.

As a doctor, Marya worries about the health impacts — the “higher burden of disease” and trauma.

“It’s unacceptable that people are living in this country in fear,” she said, “and not seeking medical help.”

Note: This story was corrected to reflect that the woman with cancer was seen in the UCSF emergency room and that a variety of groups participated in the daily immigration protests.

Matthias Gafni is a San Francisco Chronicle staff writer. Email: matthias.gafni@sfchronicle.com Twitter: @mgafni