25 years after 9/11, survivors and first responders are facing new health problems—and doctors warn the impact of the attacks is far from over

Twenty-five years after the September 11 attacks, the health consequences of the disaster are still unfolding.

For the firefighters, police officers, paramedics, volunteers and cleanup workers who spent months around Ground Zero, the danger did not end when the fires were extinguished.

People who lived, worked or attended school near the World Trade Center were also exposed to the enormous cloud of dust, smoke and debris released when the towers collapsed.


A quarter-century later, many of those people are dealing with illnesses linked to their exposure, while others are developing new health problems as they age, according to a report in Science News.

The continuing medical needs of the 9/11 community have made long-term monitoring a critical part of the disaster's legacy. The federal World Trade Center Health Program now provides medical monitoring and treatment to more than 125,000 eligible responders and survivors, and the programme is authorised through 2090.

The New York City World Trade Center Health Registry, meanwhile, has followed more than 71,000 people exposed to the aftermath of the attacks for more than two decades. Its research has identified respiratory diseases, GERD, cancers, PTSD, depression and other emerging health conditions among people exposed to the disaster.

The dust cloud became a long-term health threat

When the World Trade Center towers collapsed, lower Manhattan was engulfed in a huge cloud of pulverised building material. Dust and smoke lingered, while the continuing recovery and cleanup operation repeatedly disturbed debris at the site.

The material cited by Science News contained a complex mixture of substances capable of damaging the respiratory system and other parts of the body.

Respiratory problems were among the earliest health effects reported by responders. Asthma, persistent breathing difficulties and sinus conditions became common concerns among people who had worked at the disaster site.

But researchers gradually found that the consequences extended beyond the lungs.

The New York City Health Department says long-term studies of people exposed to the disaster have identified conditions including asthma and other respiratory illnesses, gastroesophageal reflux disease, cancer, PTSD and depression. Researchers are also investigating emerging problems such as autoimmune diseases, hearing difficulties and cognitive impairment.

The scale of the health response reflects how unusual the exposure was. Thousands of people were not exposed for minutes or hours; some responders returned to the site repeatedly over months during rescue, recovery and cleanup operations.

Some illnesses appeared years after 9/11

One of the most important lessons from the 9/11 health record is that not every consequence appeared immediately.

Early attention focused heavily on coughing, asthma, sinus problems and other respiratory complaints. Over time, however, researchers began documenting other conditions among people who had been exposed.

GERD became a significant example. The condition affects the digestive system and occurs when stomach acid repeatedly flows back into the oesophagus. Research among World Trade Center rescue and recovery workers has documented a substantial increase in GERD following the attacks.

Cancer has also become an increasingly important part of the long-term health picture.

A recent analysis by The Washington Post found that the number of 9/11 survivors receiving cancer-related assistance through the World Trade Center Health Program has risen sharply in recent years. Researchers caution that the programme's population cannot by itself establish cancer rates for everyone exposed to the attacks, but the growing medical burden has become an important focus of long-term research and care.

The CDC's own health programme says thousands of people continue to receive diagnoses for physical and mental health conditions associated with exposure to dust, smoke, debris and the traumatic events of 9/11. The agency expects some of these health effects to continue for decades.

Ageing is adding another layer to the 9/11 health crisis

For doctors treating 9/11 responders today, the challenge is no longer limited to identifying illnesses caused or worsened by the disaster.

Many of the people who were young or middle-aged in 2001 are now approaching retirement or are already older adults. That means conditions associated with ageing can appear alongside respiratory disease, cancer or other illnesses connected to their 9/11 exposure.

This creates a complicated medical picture.

Retirement can also affect mental health. For some responders, work provided a daily structure and a close connection with colleagues who shared similar experiences. Leaving that environment can remove an important source of support.

The anniversary itself can be difficult.

Twenty-fifth anniversary coverage is bringing photographs, television reports, documentaries and personal accounts of September 11 back into public view. For people who witnessed the attacks or spent months working at the disaster sites, those reminders can revive memories and emotions associated with the event.

Mental health therefore remains an important component of long-term 9/11 care alongside physical illnesses.

New records could reveal what officials knew

The 25th anniversary is also bringing renewed scrutiny of the response to the environmental health risks following the attacks.

New York City has released an initial collection of approximately 170,000 pages of records covering air quality, health concerns and the city's response to September 11. The newly opened public archive includes previously sought documents concerning the aftermath of the attacks, and the city says additional records are expected to be released over the coming year.

The documents could help researchers, journalists and affected communities better understand how authorities assessed the environmental conditions after the towers collapsed and how information about potential health risks was handled.

The release comes as the city and federal agencies continue to examine the long-term consequences of the disaster.

New York City's World Trade Center Health Registry has been particularly important in that effort. Established in 2002, it has followed people who lived, worked, went to school or participated in rescue and recovery activities around Ground Zero.

Its long-running research has helped identify health problems that may not have been apparent in the first months after the attacks.

The health programme is expected to remain important for decades

The federal World Trade Center Health Program was established under the James Zadroga 9/11 Health and Compensation Act and officially launched in 2011. It provides specialised medical monitoring and treatment for certified conditions related to 9/11 exposure.

The programme is not limited to New York. It also covers eligible responders connected to the Pentagon and the crash site near Shanksville, Pennsylvania.

Its continued existence reflects a basic reality of large-scale disasters: the health consequences can last far longer than the event itself.

New York's latest health research reinforces that point. The city says its registry has identified both established and emerging conditions among people exposed to the September 11 aftermath.

Research is also expanding to people who were children at the time of the attacks. Congress required the federal health programme to establish a youth research cohort examining people who were 21 or younger, or in utero, when they were exposed.

That work could provide a better understanding of how exposure during childhood affects health later in life.

Twenty-five years after the towers fell, the medical story of September 11 is therefore far from finished.

The attacks themselves unfolded within hours. The health consequences have followed survivors and responders for decades—and doctors, researchers and public-health officials expect that work to continue for many years to come.

Frequently asked questions

What health problems are associated with 9/11 exposure?

Research has linked 9/11 exposure with respiratory conditions such as asthma, digestive disorders including GERD, certain cancers and mental health conditions including PTSD and depression. Researchers are also studying other emerging conditions.

How many people receive care through the World Trade Center Health Program?

The CDC says the programme serves more than 125,000 responders and survivors connected to the World Trade Center, Pentagon and Shanksville disaster sites. It provides monitoring and treatment for certified 9/11-related conditions.

Why are 9/11-related illnesses still appearing 25 years later?

Some health conditions can take years to develop or become more apparent. In addition, people exposed to the attacks are now ageing, creating new medical challenges alongside conditions connected to their earlier exposure. The CDC says adverse health effects from 9/11 exposure are expected to continue for decades.

How long will the World Trade Center Health Program operate?

The programme is currently authorised through 2090, allowing eligible responders and survivors to receive medical monitoring and treatment for certified conditions associated with their 9/11 exposure.