Month: March 2023

Heavy rains and sea level rise contribute to major flooding events that are one effect of climate change. Surging water rushing into buildings often causes immediate harms, such as drowning deaths, injuries sustained while seeking shelter or fleeing, and hypothermia after exposure to cold waters with no shelter or heat.

But long after news trucks leave and public attention moves on, flooding continues to affect communities in visible and less visible ways. Among the less visible threats is a higher risk of respiratory health problems like asthma and allergic reactions. Fortunately, you can take steps to minimize or avoid flooding, or to reduce respiratory health risks after flooding occurs.

How does flooding trigger respiratory health issues?

Flooding may bring water contaminated with toxic chemicals, heavy metals, pesticides, biotoxins, sewage, and water-borne pathogens into buildings. Afterward, some toxic contaminants remain in dried sediments left behind. When disturbed through everyday actions like walking and cleaning, this turns into microscopic airborne dust. Anything in that dried flood sediment — the toxic chemicals, the metals, the biotoxins — is now in the air you breathe into your lungs, potentially affecting your respiratory health.

Buildings needn’t be submerged during flooding to spur respiratory problems. Many homes we studied after Hurricane Ida suffered water intrusion through roofs, windows, and ventilation ducts — and some were more than 100 miles away from coastal regions that bore the brunt of the storm.

The growth of mold can also affect health

Another common hazard is mold, a fungal growth that forms and spreads on damp or decaying organic matter. Indoor mold generally grows due to extensive dampness, and signals a problem with water or moisture. Damp materials inside buildings following a flood create perfect conditions for rapid mold growth.

Mold can be found indoors and outdoors in all climates. It spreads by making tiny spores that float through the air to land in other locations. No indoor space is entirely free from mold spores, but exposure to high concentrations is linked with respiratory complications such as asthma, allergic rhinitis, and sinusitis. Thus, flooding affects respiratory health by increasing the risk of exposure to higher concentrations of mold spores outdoors and indoors.

For example, after Hurricane Katrina in New Orleans in 2005, the average outdoor concentration of mold spores in flooded areas was roughly double that of non-flooded areas, and the highest concentrations of mold spores were measured indoors. A study on the aftermath of Hurricane Katrina and the flooding in the UK in 2007 showed that water damage accelerated mold growth and respiratory allergies.

Children are especially vulnerable to health problems triggered by mold. All respiratory symptoms — including asthma, bronchitis, eye irritation, and cough — occurred more often in homes reporting mold or dampness, according to a study on the respiratory health of young children in 30 Canadian communities. Other research demonstrates that mold contributes to development of asthma in children.

What can you do to protect against the health harms of flooding?

Our research in New Orleans, LA after Hurricane Ida in 2021 identified common factors — both in housing and flooding events — with great impact on respiratory health. Preliminary results suggest two deciding factors in whether substantial indoor mold appeared were the age of a building’s roof and how many precautionary measures people took after flooding from the hurricane. The impact on respiratory health also varied with flood water height, days per week spent at home, and how many precautionary measures were taken after Ida swept through.

Informed by this and other research, we offer the following tips — some to tackle before flooding or heavy rains, and some to take afterward. While you may not be able to entirely prevent flooding from hurricanes or major storms, taking these and other steps can help.

Before seasonal storms, flooding, or heavy rains start: Protect against water intrusion

• Repair the roof, clean gutters, and seal around skylights, vent pipes, and chimneys to prevent leaks. These are some of the most vulnerable components of a building during storms and hurricanes.
• Declutter drains and empty septic tanks.
• Construct barriers and seal cracks in outer walls and around windows, to prevent heavy rain and floodwater from entering.
• Install a sump pump to drain water from the basement, and backflow valves on sewer lines to prevent water from backing up into the home.

After flooding or major rainstorms: Move quickly to reduce dampness and mold growth

The Environmental Protection Agency recommends limiting contact with flood water, which may have electrical hazards and hazardous substances, including raw sewage. Additionally:

• Minimize your stay in flooded regions (particularly after hurricanes) or buildings until they are dry and safe.
• Check building for traces of water intrusion, dampness, and mold growth immediately after flooding.
• Drain floodwater and dispose of remaining sediment.
• Remove affected porous materials. If possible, dry them outdoors under sunlight.
• Increase the ventilation rate by leaving all windows and doors open, or use a large exhaust fan to dry out the building as fast as possible.
• Use dehumidifiers in damp spaces such as basements.
• Upgrade the air filters in your HVAC system to at least MERV 13, or use portable air cleaners with HEPA filters to reduce your exposure to airborne mold spores.

What to do if you spot mold growth

• Wear a well-fitted N95 face mask, gloves, and rubber boots to clean.
• Clean and disinfect anything that has been in contact with water using soap, detergents, and/or antibacterial cleaning products.
• Dispose of moldy materials in sealed heavy-duty plastic bags.

Taking steps like these — before and after a major storm — goes a long way toward protecting your respiratory health.

Read Flooding Brings Deep Trouble in Harvard Medicine magazine to learn more about the health hazards related to floods.

About the Authors

Parham Azimi, PhD, Contributor

Dr. Parham Azimi is a research associate in the department of environmental health at the Harvard T.H. Chan School of Public Health, investigating the indoor environment’s impact on occupant health and wellness and strategies to improve … See Full Bio View all posts by Parham Azimi, PhD

Joseph Allen, DSc, MPH, CIH, Contributor

Dr. Joseph Allen is an associate professor in the department of environmental health at the Harvard T.H. Chan School of Public Health, and the director of Harvard’s Healthy Buildings Program. He is the coauthor of Healthy … See Full Bio View all posts by Joseph Allen, DSc, MPH, CIH

Trauma can register within our bodies on a cellular level. What that means to an individual — and how best to heal from serious traumas encountered in life — is the focus of a newer form of mental health counseling known as somatic therapy.

The resounding success of The Body Keeps the Score — a fixture on the New York Times bestseller list for more than four years running — testifies to mounting public awareness that trauma affects people deeply. Thus far, though, somatic therapy hasn’t caught up to cognitive behavioral therapy (CBT) and related techniques in understanding, use, or research proving its worth, a Harvard expert says.

What is somatic therapy?

Most people likely haven’t heard of somatic therapy, says Amanda Baker, director of the Center for Anxiety and Traumatic Stress Disorders and a clinical psychologist in the department of psychiatry at Massachusetts General Hospital. Unlike other mind-body approaches such as mindfulness meditation, mind-body stress reduction (MBSR), and mindfulness and self-compassion (MSC) — which are steadily growing in use — somatic therapy hasn’t hit the mainstream.

What’s the fundamental concept? “It’s a treatment focusing on the body and how emotions appear within the body,” Baker explains. “Somatic therapies posit that our body holds and expresses experiences and emotions, and traumatic events or unresolved emotional issues can become ‘trapped’ inside.”

Who might benefit from somatic therapy?

Since disturbing feelings often show up in the body in debilitating ways, somatic therapy aims to drain those emotions of their power, relieving pain and other manifestations of stress, such as disrupted sleep or an inability to concentrate.

These types of emotions can stem from a variety of conditions and circumstances that somatic therapy may potentially help alleviate. They include

• post-traumatic stress disorder (PTSD)
• complicated grief
• depression
• anxiety
• trust and intimacy issues
• self-esteem problems.

“Anxiety can lead to muscle tension, particularly in the neck, shoulders, jaw, and back,” Baker says. “It can cause a lot of discomfort, pain, stiffness, and trouble with daily activities. If we’re experiencing chronic anxiety or distress, it’s almost like we have our foot on a gas pedal. It’s not a panic attack, but we’re never feeling a reprieve and there’s a constant wear and tear on the body.”

How does somatic therapy differ from talk therapies?

Typical talk therapies such as CBT engage only the mind, not the body, encouraging people to become aware of disturbing thoughts and behavior patterns and work to change them.

But in somatic therapy, the body is the starting point to achieve healing. This form of therapy cultivates an awareness of bodily sensations, and teaches people to feel safe in their bodies while exploring thoughts, emotions, and memories.

“Cognitive behavioral therapies focus on conscious thought and work on challenging thoughts in relation to anxiety and behaviors, helping desensitize people to uncomfortable sensations,” Baker says. “But somatic therapy is more about relieving the tension, as opposed to desensitizing people to it.”

Even mindfulness meditation, which some experts consider somatic in nature, differs in one key way from somatic therapy, Baker says. “Mindfulness meditation lets any feeling or emotion come into our minds without judgment, as opposed to homing in specifically on bodily sensations that are happening,” she says.

How is somatic therapy carried out?

A somatic therapist helps people release damaging, pent-up emotions in their body by using various mind-body techniques. These can vary widely, ranging from acupressure and hypnosis to breathwork and dance.

Other techniques are just as integral but aren’t household terms. Some on this list include:

• body awareness, which helps people recognize tension spots in the body as well as conjure calming thoughts
• pendulation, which guides people from a relaxed state to emotions similar to their traumatic experiences and then back to a relaxed state
• titration, which guides people through a traumatic memory while noting any accompanying physical sensations and addressing them in real time
• resourcing, which helps people recall resources in their lives that promote feelings of calm and safety, such as special people and places.

What to know if you’re considering somatic therapy

Scant scientific research has focused on somatic therapy and its benefits, Baker notes. That’s one reason why she always recommends cognitive behavioral therapy, which has proven benefits, as at least a starting point.

“Anecdotally, I’ve heard people do find tremendous benefit from somatic therapy, but it doesn’t have the same research backing yet as CBT and some other forms of therapy,” she says.

Health insurance may be more likely to cover somatic therapy, she says, when a person is dealing with extreme symptoms of mental trauma, such as seizures. Otherwise, insurers are more apt to cover established therapies such as CBT.

Additionally, finding an experienced somatic therapist can be challenging. “I think fewer folks are going to be trained in somatic therapies than CBT, so finding an experienced practitioner is definitely a tricky process,” Baker says. One useful resource is the US Association for Body Psychotherapy, which offers a Find a Therapist search tool online.

About the Author

Maureen Salamon, Executive Editor, Harvard Women's Health Watch

Maureen Salamon is executive editor of Harvard Women’s Health Watch. She began her career as a newspaper reporter and later covered health and medicine for a wide variety of websites, magazines, and hospitals. Her work has … See Full Bio View all posts by Maureen Salamon

About the Reviewer

Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing

Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD