In Candid Photos, Shannen Doherty Shows the Ravages of Breast Cancer

One picture shows the actress Shannen Doherty completely bald, a bloody cotton ball in her nose as she stares straight at the camera, looking almost confrontational.

Another is more playful — Ms. Doherty, 50, is in bed wearing Cookie Monster pajamas and a Cookie Monster eye mask. She confesses to how exhausted she is, how the chemotherapy she has had to undergo for Stage 4 breast cancer has left her plagued by bloody noses.

“Is it all pretty? NO but it’s truthful and my hope in sharing is that we all become more educated, more familiar with what cancer looks like,” Ms. Doherty wrote on Instagram this week.

The images are unsettling to any member of Generation X who remembers her as Brenda Walsh, the feisty, polarizing teenager she played for four years on the hit 1990s show “Beverly Hills, 90210,” which brought her international fame and infamy.

Ms. Doherty said she was posting the images as part of Breast Cancer Awareness Month in the hopes that they will jar people into getting mammograms and regular breast exams and help people cut through “the fear and face whatever might be in front of you.”

The unvarnished photos align with the frank nature of an actress who never seemed interested in being universally liked and are likely to resonate with a public that is reconsidering how female celebrities were treated in the 1990s and early 2000s, said Kearston Wesner, an associate professor of media studies at Quinnipiac University who teaches celebrity culture.

“The photos aren’t touched up,” Professor Wesner said. “They’re not presented in any way than the reality she’s going through. There is some feeling that when she is communicating with you, she is coming from an authentic place.”

Ms. Doherty said she learned she had breast cancer in 2015. Since then, she said she has had a mastectomy, as well as radiation and chemotherapy treatment.

The photos, which have been viewed about 280,000 times, have elicited comments of sympathy, admiration and praise on her Instagram account, which has more than 1.8 million followers.

“Love you Shan,” wrote Ian Ziering, one of her former co-stars on “Beverly Hills, 90210.”

“You are a force, Sister!” wrote Kelly Hu, an actress.

Ms. Doherty did not often get such adulation when she was younger.

In the early 1990s, Ms. Doherty, who was only 19 when she started acting on “90210,” was eviscerated by the press and many in the public who criticized her for smoking in clubs, her tumultuous love life and reports that she was difficult on set.

Her character was an outspoken, headstrong and temperamental teenager who had sex with her boyfriend, fought with her friends and rebelled against her father.

Soon, some fans of the show conflated Ms. Doherty with her character and began calling for her to be fired.

They formed an “I Hate Brenda” club. MTV News dedicated a three-plus-minute segment to the sentiment, quoting people who mocked her looks and her decision to attend the Republican National Convention in 1992. One clip in the MTV segment showed a group of partygoers hitting a “Brenda piñata.”

She left “Beverly Hills, 90210” in 1994, then went on to appear in the 1995 movie “Mallrats” and several television movies and shows. In 2019, she appeared in a brief reboot of the original “90210″ called “BH90210.”

In an interview with The New York Times in 2008, Ms. Doherty said that the bad publicity around her was often based on exaggerations or “completely false” stories.

“I really could care less about it anymore,” she said in the interview. “I have nothing to apologize for. Whatever I did was my growing-up process that I needed to go through, that anybody my age goes through. And however other people may have reacted to that is their issue.”

If you were a fan of Ms. Doherty, the headlines hurt, said Professor Wesner, 45, who watched Ms. Doherty grow from a child actor in “Little House on the Prairie” into roles like Heather Duke in the 1988 movie “Heathers,” and Brenda Walsh.

“She meant a lot to me,” said Professor Wesner. “I myself was an outspoken girl and I’ve gotten slammed for it, too. For me, seeing someone who was also outspoken and also a ‘difficult woman’ was satisfying.”

The coverage of Ms. Doherty was reflective of a time “when publications would attack, would fat shame, would ugly shame, would anorexia shame,” said Stephen Galloway, the dean of the Dodge College of Film and Media Arts at Chapman University in Orange, Calif., and a former executive editor of The Hollywood Reporter. “There was no line between taste and vulgarity. It was anything goes.”

And it severely damaged Ms. Doherty’s career, he said.

Her decision to document the effects of cancer is “a great step toward redemption and meaningfulness” that could help people, said Mr. Galloway, who said he learned about a week ago that he was in the early stages of cancer.

He said Ms. Doherty’s openness had made him feel more comfortable talking about his own diagnosis.

“I looked at her and I thought, ‘what courage,’” Mr. Galloway said.