A college in Beijing has found itself at the centre of public fury after it allegedly asked a student to prove she was on her period to qualify for sick leave.

A viral video, filmed inside what appears to be a clinic and posted to social media this month, shows a young woman asking an older woman: "Does every menstruating girl have to take off their trousers and show you before they can get a sick note?"

"Basically yes," the older woman replies. "This is a school rule."

Local media identified the video's location as a clinic at the Gengdan Institute university college, which later said in a statement that its staff had "followed protocol". But social media users have decried the encounter as a serious invasion of privacy.

Neither the student nor Gengdan Institute immediately responded to BBC News' requests for comment.

Both the student's video and the school's statement appear to have been taken down, though screenshots and snippets have been recirculated online, including by state media.

On Douyin, China's TikTok, a user claiming to be the student said her original account was suspended for 30 days for "pornographic content" after she posted the video.

In its statement dated 16 May, Gengdan Institute reportedly said the videos of the incident circulating online had been "distorted" - and that the institution had the right to pursue legal action against those who "maliciously spread untrue videos".

The statement also said that the staff had followed the proper procedure during the encounter, such as "initiating clinical work after getting the student's permission", and did not use tools or conduct a physical examination.

In the video, the staff member did not reply when the student asked for written proof of the school regulation to check students' menstrual status. She subsequently asked the student to go to a hospital instead.

On social media, the incident has triggered an outpouring of anger and sarcasm towards the school's rules.

"My head hurts, should I open my skull and call it a day?" wrote one social media user.

"Let's just take the sanitary pad out and paste it on the sick note," another Weibo said.

A staff member at Gengdan Institute told local outlet Dute News that the school may have created the rule about proving menstruation in order to deter students from faking periods to get sick notes.

But that argument has rung hollow among social media users.

"If they're worried about students using their periods as an excuse several times a month, why not simply make a record of it? It's not that complicated," one person wrote on Weibo.

State media has also waded into the debate.

"Menstruation is already an intimate topic for women. Rules like this will make students feel very uncomfortable, and even negatively impact students' psychological wellbeing," reads an opinion piece from China National Radio.

Gengdan Institute now joins a list of tertiary institutions across the country that have come under fire for what many see as overbearing and ham-fisted attempts at controlling their students.

Last year, some universities were criticised for banning the use of bed curtains in their dormitories. The curtains are often used by students for privacy in shared rooms, but school authorities said they were a fire and safety hazard.

Additionally, during the popular May Day holiday season last year, some universities issued strict guidelines for students who had planned to travel. These included avoiding solo trips, road trips, or cycling trips for safety - which many saw as the institutions overstepping their authority in students' private lives.

On social media site Xiaohongshu, a user claiming to be a student at Gengdan Institute said "the school's clinic deserves all the criticism it's getting".

"I heard from some older students that this kind of thing has been going on for a while. Some girls spoke up before, but nothing was done," the user wrote.

"I'm glad it made the trending topics this time. People didn't stay silent."