Which of the following is a common symptom of allergic rhinitis?

Nasal congestion is a hallmark symptom of allergic rhinitis, which is an inflammation of the nasal passages triggered by allergens such as pollen, dust, or pet dander. This condition leads to the swelling of nasal membranes, increased mucus production, and a blockage of the nasal passages, all contributing to that stuffy feeling commonly experienced. Allergic rhinitis often occurs seasonally or annually, and individuals may also experience sneezing, itching, and runny nose, but nasal congestion is a primary symptom that directly results from the body's allergic response.

Other symptoms like ear pain, vision changes, and headaches may occur in various conditions, but they are not directly associated with allergic rhinitis itself. Ear pain might be linked to a middle ear infection or Eustachian tube dysfunction, vision changes are more often related to eye conditions or neurological issues, and headaches can arise from various causes, including tension or sinusitis. Therefore, nasal congestion distinctly marks allergic rhinitis as a prevalent condition affecting many individuals.