Memorials have been held around Australia and in Papua New Guinea for a Rohingya refugee who died on Manus Island this week.

The man, 52, jumped from a moving bus on Tuesday.

He is the seventh asylum seeker from Manus Island to die, and the men remaining on the island said his death highlights serious concerns about the health care and support they receive.

The man had a wife and three children in Myanmar.

A close friend and fellow Rohingya refugee, who wished to remain anonymous, said the family has been devastated by his death.

"If anyone can do, please, please, please do something for his family," he said.

"Their situation is very bad. Very bad."

Sudanese refugee Aziz Adam, who helped organise a memorial inside one of the new asylum seeker camps on Manus Island, said the Rohingya asylum seeker had been well known and his death had upset many people.

"All of us, we have been touched, and I've seen people who were crying, especially the guys who were close to [the man], friends, best friends," he said.

"Some of us were crying when we heard that incident and some of us, we don't believe that [the man] is gone."

A memorial held on Manus Island for a Rohingya asylum seeker, who died this week. ( Supplied )

Refugee had frequent seizures, grew frustrated with care

Refugee advocacy groups said the Rohingya asylum seeker had epilepsy and a record of mental health problems while in detention.

He was reportedly violent towards staff in the detention centre.

But friends said he was a peaceful man who had become increasingly frustrated at the care he was receiving for his epilepsy, which caused frequent seizures.

Barri Phatarfod, from Doctors For Refugees, was monitoring his case.

"He suffered from temporal lobe epilepsy [and] it was poorly controlled, so he had seizures up to twice a week," she said.

Dr Phatarfod said recent seizures had caused the man to collapse and injure himself.

"He had cuts on his face, gravel embedded in his skin, he had cut his tongue and on a couple of occasions he had his teeth come loose, so all these things can clearly take their toll," she said.

He had been taken to Australia for treatment, where Dr Phatarfod said his epilepsy was better managed, but was returned to Manus Island.

Dr Phatarfod said there were many refugees on Manus Island who have developed severe mental health problems because they had physical ailments that were not properly treated.

"Now that ranges in severity from anxiety and depression through to post-traumatic stress disorder and in some cases, acute psychosis," she said.

"Many people who have had physical complaints eventually, because they are inadequately or poorly treated, do end up having mental health issues."

Reduction in healthcare staff on Manus Island

Officials from Australia's Department of Home Affairs, which contracts the medical services on Manus Island, told Senate Estimates the Australian Government has maintained the standard of care for the men on Manus since the closure of the detention centre in October last year, but said a "smaller capability" was required at the three new sites.

The man's family has been devastated by his death, a close friend said. ( Supplied )

First assistant secretary David Nockels said there were 25 healthcare staff operating under a new contract on Manus, but that included administration staff and technicians.

That was a reduction from the previous contract and Mr Nockels conceded the specific mental health service for torture and trauma counselling was no longer available, although three mental health staff remained on the island.

There are more than 600 asylum seekers and refugees on the island, roughly 500 of whom are under consideration for resettlement in the United States.

The Department of Home Affairs told Senate Estimates that 34 refugees have been approved for US resettlement and are in Port Moresby, but many refugees on the island are yet to be interviewed and have no indication of when they will be processed.