Asthma and Chronic Obstructive Pulmonary Disease (COPD) are respiratory conditions that affect millions of people across the globe. These two conditions share many similarities and differences, which may confuse healthcare professionals when diagnosing and managing them, as they affect an increasing number of people worldwide every year. Although both illnesses share many similarities, they also differ in many ways. Here, it is important to note that asthma is not COPD and COPD is not asthma. They differ in aetiology and symptoms and require different treatment courses.  In this blog, you will learn about Asthma and COPD separately and explore COPD vs Asthma to better understand them.

Asthma

Asthma is defined as a chronic disorder of the airways. Chronic inflammation is related to airway hyperresponsiveness, which ultimately leads to recurrent episodes of breathlessness, wheezing, coughing, and chest tightness, particularly at night or in the early morning. These signs and symptoms are usually related to widespread but variable airflow obstruction in the lungs, which is often treatable. Asthma is a serious global health concern, affecting an estimated 300 million people. The respiratory illness can affect people of all ages when uncontrolled, severely limiting their activities in daily life and is sometimes life-threatening. The prevalence of asthma is increasing in many countries. Symptoms of the condition can be controlled with an appropriate treatment approach. When asthma is well controlled, severe exacerbations should be rare. Factors that influence the risk of asthma can be divided into those that contribute to asthma or those that trigger asthma symptoms; some do both. The primary factors are genetic, and the second are usually environmental.  

Factors affecting the development and expression of asthma

A combination of genetic factors and environmental exposures contributes to asthma. Some individuals are more prone to allergic reactions or sensitive airways, while environmental factors can trigger or worsen asthma symptoms. However, these influences can vary from one individual to another.

Host factors

Genetic Factors: Certain inherited characteristics can increase the risk of developing asthma. These may include genes associated with atopy, the tendency to develop allergic conditions, and genes that make the airways more sensitive and likely to narrow in response to various triggers.  

Obesity: Excess body weight may increase the risk of developing asthma and can also affect how severe or difficult to control symptoms become.      

Sex:  Asthma can affect both men and women. However, its frequency and characteristics may differ by age and hormonal influences.

Environmental factors: Environmental exposures are also considered a major reason for the development of asthma. Common ones are:  

• Allergens – Indoor allergens including pet dander, house dust mites, cockroach particles, rodents, fungi or moulds. Whereas outdoor allergens such as pollen and airborne fungi can contribute to asthma.

• Respiratory infections – Viral infections, specifically those affecting the respiratory tract, may trigger asthma symptoms and may cause flare-ups.

• Indoor and outdoor pollution – Traffic, smoke, industrial emissions, and poor indoor air quality may cause airway irritation.

• Tobacco smoke – It is believed that both active smoking as well as exposure to second-hand smoke can cause irritation to the airways in the lungs and increase asthma symptoms.

• Occupational exposure – In addition to dust, exposure to fumes, chemicals, and other substances at work can worsen asthma in susceptible individuals.

• Diet – Nutritional factors and dietary patterns can also affect respiratory health, though their effects can vary from one individual to another.

Airway inflammation in asthmatics

Asthma symptoms such as coughing, wheezing, shortness of breath, and chest tightness may occur, but inflammation is a main feature of the airways even when individuals do not have symptoms.  Inflammation associated with asthma can affect the entire respiratory system. The psychological effects are particularly apparent in the medium-sized bronchi, where inflammation and airway narrowing can impair normal airflow.  In the same way, inflammatory processes can appear in different forms of asthma, including allergic and non -allergic asthma, as well as asthma triggered by the use of certain medications such as aspirin.  

Inflammatory cells in asthmatic airways: Eosinophils are a type of inflammatory cell that commonly increase in many forms of asthma. They produce proteins and other substances that can harm the airway lining and trigger ongoing inflammation. They may also be involved in structural changes or airway remodelling that can happen over time.

COPD

COPD is considered one of the major causes of chronic morbidity and mortality and one of the major public health issues across the world. If data is to be believed, COPD is the fourth leading cause of death in the world, and further increases in its prevalence and mortality can be predicted. COPD is chronic obstructive pulmonary disease, which is another long-term respiratory condition that causes persistent airflow obstruction. It is different from asthma, although some symptoms, including wheezing, coughing and shortness of breath, can overlap. COPD is commonly associated with long-term exposure to tobacco smoke and other harmful airborne particles or gases. The respiratory condition causes chronic inflammation and structural changes in the airways and lungs, which can progressively restrict breathing.    

The key differences between COPD and Asthma

Usually, asthma causes airflow obstruction, meaning the airways can narrow over time and may improve with treatment or by avoiding triggers. Asthma and COPD often share similar signs and symptoms, but differ in how airflow is affected. Asthma is believed to cause variable airway narrowing, meaning symptoms can change over time and often improve with appropriate treatment or by avoiding potential triggers. COPD generally causes persistent airflow limitation that may become less reversible as the condition progresses.

Symptoms may also vary to some extent. Asthma causes episodes of wheezing, coughing, chest tightness, or shortness of breath after exposure to triggers like allergens, cold air, exercise, or respiratory infections. Between episodes, breathing may return to normal. On the other hand, COPD symptoms tend to be persistent and may gradually worsen, particularly with physical activity.

Smoking is the main culprit for COPD, although long-term exposure to air pollution, dust, and chemical fumes can also contribute. Asthma is more commonly associated with allergies, airway sensitivity, genetic factors, and environmental triggers. Smoking can also aggravate asthma symptoms.

Diagnosis

Diagnosis of these respiratory conditions is usually done after analysing symptoms, medical history, exposure to risk factors, and performing a physical examination. An important test is Spirometry, a lung function test that measures how much air a person can exhale and how quickly. It helps healthcare providers identify airflow limitation and distinguish between different respiratory conditions. Other tests may be recommended when needed.

Treatment option

Asthma treatment helps to control airway inflammation and prevent asthma episodes. COPD management supports symptomatic relief, improves exercise tolerance, reduces exacerbations, and maintains lung function. Medications such as inhaled bronchodilators (Asthalin HFA inhaler 100 mcg, Duolin inhaler) are commonly prescribed to manage COPD, while inhaled corticosteroids (Foracort Inhaler) are crucial for asthma relief. These medications are available at affordable prices on AllDayChemist, one of the leading platforms for authentic medications. One can explore the options in the asthma category of the website. Consult your doctor to know the best medicine for you. Avoiding known triggers, quitting smoking, staying physically active, keeping vaccinations up to date, and following prescription medicines correctly can support better respiratory health.

Conclusion

COPD can coexist with asthma; both involve an underlying airway inflammation. It is believed that chronic airway inflammation differs markedly between these two diseases. However, those asthma patients who are exposed to harmful agents, particularly cigarette smoke, may develop fixed airflow limitation and asthma-like and COPD-like inflammation. Moreover, research suggests that long-standing asthma alone can contribute to fixed airflow limitation. Patients suffering from COPD may have features of asthma, including a mixed inflammatory pattern with increased eosinophils. Thus, while asthma can usually be differentiated from COPD, in some individuals with chronic respiratory symptoms and persistent airflow obstruction, it is still tough to differentiate between the two diseases.

Also Read: Difference Between Asthma and Allergies: Symptoms, Causes, and Treatment