Heat and humidity raise breathing strain for asthma and lung patients

Extreme heat places extra strain on the respiratory system, a pulmonologist told viewers in a health segment on managing lung conditions during hot, humid weather.

Dr. Scott, a pulmonologist, said rising ambient temperatures increase the body's need to shed heat. People lose fluid not only through sweat but also through breathing. That can drive a higher respiratory rate as the body tries to cool itself. Heat also lifts metabolism, which means greater oxygen intake and more carbon dioxide to expel — further loading the lungs.

Outdoor humidity can worsen breathing for people with respiratory disease. Asthma is especially common in Jamaica, affecting as many as one in five people. Humidity can also trouble those with chronic obstructive pulmonary disease — often called emphysema or smoking-related lung disease — and other long-term respiratory illnesses.

For people already living with asthma, a Ventolin inhaler is a familiar rescue treatment. A few puffs can ease chest tightness, and clinicians advise keeping it on hand during hot, humid summer conditions.

Those most likely to struggle as temperatures climb are people with existing lung disease in its more severe forms. Patients with advanced emphysema may already be working near full lung capacity and have little reserve when heat rises. They often notice harder breathing and greater shortness of breath.

Older adults can face similar pressure even without major lung disease. Organ reserves decline with age, so someone in their nineties typically has far less capacity than a young adult when heat increases demand.

Higher temperatures also raise dehydration risk for people with sickle cell disease, which is common in Jamaica. The condition impairs the kidneys' ability to concentrate urine. People with kidney disease likewise fare poorly when dehydrated, and fluid loss can worsen their underlying problems.

Doctors caution against overdoing fluid intake. Healthy people can usually handle large volumes of water, but those with kidney, heart or lung disease must be careful. They may need more fluids in hot weather, yet excess can tip the balance the other way and make their condition worse — a pattern seen when people overcompensate for fluid loss.

For asthma and other lung patients, Dr. Scott stressed sticking to prescribed medication to help prevent decline. Home oxygen can ease breathlessness, but needing to switch it on is also a warning that the condition has worsened. Oxygen at home is a stopgap until proper medical care is obtained.

As temperatures stay high, specialists urge people with respiratory and related chronic conditions to protect their lung health through medication adherence, sensible hydration and prompt care when breathing worsens.