Final answer:
The condition caused by inhaling allergens that affects the respiratory tract is asthma, a chronic inflammatory disease of the lungs. Asthma leads to difficulty in breathing and can be triggered by various allergens.
Step-by-step explanation:
The condition caused by allergens that enter the respiratory tract when inhaled is asthma. Asthma is a chronic inflammatory disease where the airways in the lungs become inflamed, leading to swelling, narrowing, and often excessive mucus production. This results in difficulty breathing, among other symptoms. Asthma attacks are commonly triggered by allergens like pollen, dust mites, and mold, as well as other factors such as air pollution. Another potential condition is allergic rhinitis, also known as hay fever, which can be triggered by inhaling allergens such as ragweed pollen, causing sneezing, red itchy eyes, and other similar symptoms.