Types of Asthma

Asthma comes in different forms, and each type behaves differently. Some are triggered by allergens like dust or pollen. Others develop from infections, cold air, or stress. The symptoms may look similar, but the cause and treatment can vary. If you don’t know which type you have, your treatment might not work well.

This article explains the main types of asthma, how they show up, and how doctors manage each one. Knowing the difference can help you breathe easier and avoid serious flare-ups.

What Are The Different Types Of Asthma?

Different types of asthma require different treatment approaches. Misidentifying your asthma type may lead to poor symptom control, unnecessary hospital visits, and a reduced quality of life.

1. Allergic (Extrinsic) Asthma

Extrinsic asthma, also called allergic asthma, happens when your immune system overreacts to allergens. Common triggers include:

• • Pollen (trees, grasses, weeds)
  • Dust mites
  • Pet dander (cats, dogs)
  • Mold spores
  • Cockroach droppings
  • Certain workplace allergens (like animal proteins or flour)

When you breathe in these allergens through your nose or mouth, they travel down into your lungs and airways.

Once the allergen reaches your lungs, your immune system overreacts. It tries to protect you by releasing IgE antibodies, which are normally used to fight off real threats like viruses or bacteria. These antibodies activate certain immune cells, which then release chemicals like histamine and cytokines.

These chemicals cause inflammation in your airways. That includes swelling of the airway lining, extra mucus production, and tightening of the muscles around your airways (bronchospasm).

Symptoms

As a result, your airways become narrowed, irritated, and clogged with mucus. This makes it difficult for air to pass in and out of your lungs. You start to experience common asthma symptoms like:

• • Wheezing
  • Coughing
  • Shortness of breath
  • Chest tightness
  • Nasal congestion and postnasal drip
  • Itchy eyes and sneezing

Diagnosis

Since allergens trigger extrinsic asthma, the National Asthma Education and Prevention Program (NAEPP) recommends allergy testing. This may include:

• • Skin prick tests, where small amounts of allergens are placed on your skin to see if a reaction occurs

• • Blood tests (like IgE testing), to measure your immune system’s response to specific allergens

If your symptoms don’t match an allergic pattern, your doctor may consider additional tests to find out what else could be contributing.

Treatment

Before jumping into medication, doctors recommend identifying your asthma triggers and reducing or avoiding exposure to those triggers as much as possible.

This might mean using air filters, encasing pillows, removing rugs, or limiting outdoor activity during high pollen or mold spore days. In some cases, this alone can reduce how often or how severely symptoms occur.

If avoiding triggers doesn’t fully control your symptoms, medications may be added. These include:

• • Inhaled corticosteroids (e.g., Asmanex Twisthaler, Qvar RediHaler, Alvesco) to control airway inflammation.

• • Leukotriene inhibitors or antihistamines (e.g., Singulair) to block allergy-related pathways.

• • Immunotherapy (e.g., Grastek) to desensitize your immune system over time.

Extrinsic asthma usually starts in childhood, often comes on suddenly, and may last a few hours or days. Boys are affected more than girls. Many children outgrow it, but about 30% continue to have symptoms as adults. This type often runs in families and is linked to other allergic conditions like eczema in infancy and nasal allergies later in life.

2. Non-Allergic (Intrinsic) Asthma

Intrinsic asthma is a type of asthma triggered by non-allergic factors. It tends to start in adulthood and is usually more constant, with fewer clear attacks and recoveries. It also includes several subtypes based on what triggers the symptoms or how the asthma presents.

These include:

Symptoms

Intrinsic asthma causes similar symptoms to extrinsic asthma, which include:

• • Tight chest and shortness of breath
  • Wheezing
  • Coughing
  • Mucus
  • Bluish tint to the skin (cyanosis)

Symptoms often get worse with age and during winter, especially when infections are involved.

Diagnosis

Since intrinsic asthma isn’t triggered by allergens, diagnosis focuses on identifying asthma symptoms in the absence of allergic sensitization. Your doctor will ask about your symptom patterns, triggers, and when the asthma began, as intrinsic asthma typically starts in adulthood.

To rule out allergic (extrinsic) asthma, your doctor may order skin prick tests or specific IgE blood tests. If these tests are negative, further evaluation usually includes lung function tests (like spirometry) to confirm asthma.

In some cases, a CT scan may also be done to look for nasal polyps or chronic sinusitis, which are more frequently seen in people with intrinsic asthma.

Treatment

Intrinsic asthma is managed similarly to other forms of asthma, with an emphasis on avoiding non-allergic triggers such as respiratory infections, chemical irritants, cold air, emotional stress, or medications like aspirin.

Treatment typically begins with inhaled corticosteroids (such as budesonide or fluticasone) to reduce airway inflammation. For individuals with aspirin-induced asthma, leukotriene receptor antagonists like montelukast are particularly helpful in controlling symptoms.

Several inhalers are approved to prevent flare-ups for those who experience exercise-induced bronchospasm. These include short-acting bronchodilators like albuterol and Ventolin HFA, as well as long-acting options such as Serevent Diskus (salmeterol).

3. Nocturnal Asthma

Nocturnal asthma means your asthma gets worse at night. People with this condition often notice more symptoms, need more medication, and have worse lung function during sleep. Studies show that 75% of asthma patients experience sleep disturbances from symptoms at least once weekly, and 40% deal with them on a nightly basis.

The main reason has to do with the body’s natural daily rhythms, called circadian rhythms. This rhythm affects how your lungs work, how your immune system behaves, and how certain hormones are released.

Here’s why asthma worsens at night:

• • Lung function naturally drops at night – Your lungs work best in the afternoon, but by around 4 a.m., lung function drops, more so in people with asthma. While most people see only a small change, people with asthma can experience up to a 50% decline in lung performance.

• • Hormone levels change overnight – Adrenaline drops at night, which normally helps keep airways open. At the same time, cortisol, which reduces inflammation, also falls. Melatonin, which rises at night, may also contribute to reduced lung function.

• • Increased airway inflammation – The body’s internal clock can make inflammation worse at night, leading to tighter, more sensitive airways.

Other common nighttime triggers

• • Post-nasal drip (mucus dripping down your throat while lying down
  • Allergens in the bedroom, like dust mites or pet dander
  • Cold night air entering through the nose or mouth during sleep
  • Lying flat on your back (can cause fluids, such as mucus or stomach acid, to collect in your airways)

Finally, certain health issues often occur alongside asthma and can worsen symptoms, especially at night. These include acid reflux (GERD), sleep apnea, allergic rhinitis, and obesity, all of which can contribute to airway inflammation or obstruction during sleep. Research using symptom-based surveys has found that up to 80% of individuals with asthma report GERD symptoms like heartburn, regurgitation, or trouble swallowing.

Symptoms

Nighttime asthma symptoms are similar to those that occur during the day, but they’re often more intense. People with nocturnal asthma commonly experience:

• • Coughing
  • Shortness of breath
  • Wheezing
  • Chest tightness

These symptoms may begin just before falling asleep or occur during the night, often leading to poor sleep quality. Over time, this can cause fatigue, irritability, and even worsen daytime asthma symptoms.

Nocturnal asthma can be serious and potentially life-threatening. Alarming data shows that more than half of all fatal asthma attacks occur between midnight and 8 a.m.

Diagnosis

Patients are often asked to monitor nighttime symptoms and undergo lung function tests to assess asthma control.

Nocturnal asthma can be more difficult to diagnose in children because they may not recognize or clearly describe what they’re experiencing. If your child frequently coughs, wheezes, or has trouble breathing at night, discuss these symptoms with your child’s doctor to explore possible asthma-related causes.

Treatment

To manage nocturnal asthma effectively, it’s important to take your asthma medications consistently every day, even when you feel fine. Treatment usually involves a combination of medications and lifestyle adjustments.

• • Maintenance Inhalers – These are taken every day to reduce airway inflammation and prevent nighttime attacks. They include inhaled corticosteroids (Flovent HFA, Flovent Diskus, Asmanex Twisthaler), and combination inhalers (Advair Diskus, Advair HFA, Breo Ellipta).

• • Rescue Inhalers – These work within minutes to open the airways and are used at the first sign of symptoms. Commonly used rescue inhalers are albuterol and levalbuterol.

In addition, make sure to address any comorbid conditions, such as GERD or sleep apnea, as these can worsen nighttime asthma symptoms and interfere with treatment effectiveness.

4. Cough-Induced Asthma

Cough is a major symptom in asthma, and it can appear in different ways. Based on clinical features, cough in asthma is usually classified into three categories:

• • Cough Variant Asthma (CVA) – CVA is a form of asthma where chronic cough is the only symptom. There are no other typical asthma signs like wheezing or shortness of breath. It is actually one of the leading causes of long-term cough. If left untreated, 30-40% of adults with CVA may eventually develop classic asthma, which includes full symptoms like wheezing and breathing difficulty.

• • Cough-Predominant Asthma – In this type, cough is the main symptom, but other signs of asthma are also present. These symptoms might be subtle and need careful medical questioning or examination to detect.

• • Cough That Persists Despite Standard Asthma Treatment – This refers to patients who continue coughing even after their other asthma symptoms (like wheeze or breathlessness) are well controlled with standard therapies such as inhaled corticosteroids and bronchodilators. There are two subtypes in this category:

• • • • a. Cough Driven by Inflammatory Mediators: The cough responds to non-standard asthma treatments like leukotriene receptor antagonists, antihistamines, and thromboxane inhibitors. This kind of cough is likely due to specific inflammatory pathways not targeted by ICS or bronchodilators.

• • • • b. Cough Caused by Other Conditions (e.g., GERD): Sometimes, the persistent cough is caused by another condition like gastroesophageal reflux disease (GERD). As mentioned earlier, GERD is common in asthma patients and may create a vicious cycle, where reflux worsens cough, and coughing triggers more reflux. In these cases, anti-reflux medications can help reduce the cough.

Symptoms

The main symptom is a persistent dry cough that usually lasts for more than 8 weeks.

It is often worse at night, which can interfere with sleep, and may also be triggered by exercise or exposure to cold air. Unlike a typical cough caused by a cold or respiratory infection, this type of cough does not go away easily and may be the only noticeable symptom.

Diagnosis

Diagnosing CVA can be tricky because there is no wheezing or obvious shortness of breath. Here’s how it’s usually identified:

• • Chronic cough without other obvious causes – The cough lasts for more than 8 weeks, and infections, GERD, postnasal drip, or medications (like ACE inhibitors) have been ruled out.

• • Response to bronchodilators – The most important clue is that the cough improves after using a bronchodilator (like albuterol). This is considered essential for diagnosis, especially if the improvement is clear. Some guidelines, like those from the Japanese Respiratory Society, use this as the main diagnostic tool.

• • Airway hyperresponsiveness (AHR) – This means the airways are overly sensitive and react easily to triggers (like cold air or exercise). AHR supports the diagnosis but is not enough on its own to confirm CVA.

• • Sputum eosinophilia (optional) – If tested, high eosinophils in sputum (over 3%) suggest CVA or another eosinophilic airway condition. However, only about 30% of CVA patients show this, so it’s not required.

• • Elevated exhaled nitric oxide (FeNO) – Higher levels of FeNO may indicate airway inflammation, which supports the diagnosis. It’s a useful but not definitive test.

Treatment

The main treatment for cough-induced asthma is inhaled corticosteroids, which help control the cough and reduce airway inflammation. They also lower the risk of progression to classic asthma, likely by preventing long-term damage and airway narrowing.

5. Severe Asthma

This type of asthma is characterized by persistent symptoms despite high doses of medications. In 2010, the World Health Organization (WHO) identified three types of severe asthma:

• • Severe untreated asthma – when patients never received proper treatment
  • Difficult-to-control severe asthma – when symptoms persist due to factors like poor adherence or environmental exposure
  • Severe refractory asthma – when asthma remains uncontrolled despite proper treatment and care

Another form of severe asthma is eosinophilic asthma, which is marked by high levels of eosinophils, a type of white blood cell.

Under normal conditions, eosinophils are cleared out of the body through a process called apoptosis, where they die off naturally and are removed by macrophages without triggering inflammation. However, this process may be disrupted in eosinophilic asthma, allowing eosinophils to linger and worsen inflammation.

Though the exact number of people affected is unclear, eosinophilic asthma is believed to account for about half of all severe asthma cases.

Severe asthma also puts a heavy burden on healthcare systems. For instance, healthcare costs for patients with severe refractory asthma are at least 80% higher than those with stable asthma. This is largely due to increased use of medical services and the long-term side effects of oral corticosteroids (OCS), which are often required to manage severe cases.

Symptoms

The symptoms of severe asthma are generally the same as those in other types of asthma, but they are more intense, more frequent, and harder to control. Common signs include:

• • Experiencing asthma symptoms like shortness of breath, chest tightness, or coughing more than twice a week
  • Waking up at night due to asthma symptoms more than twice a month
  • Using a rescue inhaler more than twice weekly
  • Avoiding activities because of asthma-related discomfort or flare-ups

Although rare, severe asthma can be life-threatening and, in some cases, fatal if not properly managed. Severe attacks can cause the airways to tighten so much that it becomes extremely difficult to breathe, which can lead to respiratory failure if emergency treatment isn’t given in time.

Diagnosis

If you experience three or more of the symptoms listed above, your asthma is likely considered uncontrolled or severe. When your lung function is checked, such as with spirometry or a pulmonary function test (PFT), results often show a significant reduction in breathing capacity, which is common in people with severe asthma.

Although there’s no single, universal definition for eosinophilic asthma, clinical studies often use blood eosinophil counts of 150 cells/µL or higher, and sometimes 300 or 400 cells/µL. Eosinophils in the sputum above 2-3% are also used to help identify this subtype, which can often be recognized in primary care settings.

Treatment

When you have severe asthma, you may need higher doses of inhalers and additional medications like anticholinergics (Spiriva Respimat, Spiriva HandiHaler, Atrovent HFA, Combivent Respimat), which help by relaxing the muscles around your airways to make breathing easier.

In some cases, inhaled medications alone may not be enough, and long-term use of oral steroids can lead to serious side effects over time.

Recently, biologic medications have become available to treat severe asthma. These medications are used when standard inhalers and steroids aren’t enough, especially for allergic or eosinophilic asthma. They are given as injections or infusions, usually every few weeks.

6. Asthma-COPD Overlap Syndrome (ACOS/ACO)

Asthma and chronic obstructive pulmonary disease (COPD) are two of the most common lung conditions that cause airway obstruction. They can look and feel very similar in patients, and even their test results, like pulmonary function tests, often appear alike.

Because of these similarities, doctors use the term “asthma-COPD overlap” (ACO) when a person shows signs of both asthma and COPD. This condition was first described in 2009.

However, ACOS is still not officially recognized as a separate diagnosis in major guidelines like GOLD (Global Initiative for Chronic Obstructive Lung Disease), because there’s no agreed-upon definition yet.

Symptoms

People with ACOS often have symptoms like:

• • Coughing
  • Wheezing
  • Frequent lung infections
  • Signs of both asthma and COPD

Diagnosis

The first step in checking for ACO is doing a pulmonary function test. This test measures how well your lungs are working, and the FEV1 level (forced expiratory volume in one second) helps show how severe the obstruction is.

To diagnose ACO, a person needs to meet all 3 major criteria and at least 1 minor criterion.

Major criteria include:

• • Age 40 or older with chronic airflow obstruction (post-bronchodilator FEV1/FVC < 0.70)
  • At least 10 pack-years of smoking history
  • A history of asthma before age 40 or a large bronchodilator response (increase in FEV1 of more than 400 mL)

Minor criteria (at least 1 of these) include:

• • History of atopy (allergies) or allergic rhinitis
  • A bronchodilator response in FEV1 of 200 mL and 12% improvement on two or more occasions
  • A peripheral blood eosinophil count of more than or equal to 200 cells/µL

The Global Initiative for Asthma (GINA) supports using the same criteria for identifying ACO.

Treatment

According to GINA and GOLD guidelines, treatment for ACO should begin with an asthma-based approach, since inhaled corticosteroids are essential for reducing airway inflammation, especially when you have asthma-like symptoms.

You should always have a fast-acting bronchodilator on hand for quick symptom relief. These include:

• • A short-acting beta agonist (SABA)
  • A short-acting muscarinic antagonist (SAMA)
  • Or a combination of both SABA and SAMA

Be careful to avoid using a long-acting beta agonist (LABA) by itself. This is especially important if you have asthma features. The SMART trial found that LABA-only treatment increased the risk of asthma-related deaths, particularly among African American patients.

Step-Up Therapy Options

If symptom control remains inadequate, ICS/LABA combination inhalers (Symbicort, Dulera) are a preferred next step. A 2015 clinical trial found that ACO patients experienced better lung function when switching to fluticasone furoate/vilanterol once daily (Breo Ellipta), compared to twice-daily fluticasone propionate/salmeterol (Advair Diskus/HFA).

If symptoms persist despite ICS/LABA or ICS/LAMA therapy, adding a long-acting muscarinic antagonist (LAMA) like umeclidinium (Incruse Ellipta) to the regimen (creating triple therapy like Trelegy Ellipta) has been shown to provide additional benefit.

Biologic Therapies

If you’re still struggling with flare-ups despite inhaled treatments, you may be a candidate for biologic medications.

Macrolide Antibiotics

Your doctor might also consider macrolide antibiotics like azithromycin (Zithromax) if you have frequent exacerbations and non-eosinophilic inflammation. These medications have anti-inflammatory and immune-modulating effects and are used more often in COPD care.

While their role in asthma isn’t well established, they may benefit certain ACO patients, though more research is still needed.

Summary

Asthma comes in different forms, and each type needs a specific approach. If your symptoms aren’t improving, it may be because your asthma type hasn’t been correctly identified. Getting the right diagnosis matters.

Understand your specific asthma type, avoid your triggers, and follow the treatment plan that works for you. This gives you the best chance to keep symptoms under control and avoid serious flare-ups.

Frequently Asked Questions