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Indoor allergy (perennial allergic rhinitis) - Symptoms of an indoor allergy

NHS Choices Medical Reference

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The symptoms of an indoor allergy usually have two phases:

  • the early phase, which occurs minutes after exposure to the offending allergen, and
  • the late phase, which occurs four to eight hours after exposure.

The early phase

The early phase symptoms of indoor allergy include:

  • sneezing,
  • runny nose,
  • blocked nose (nasal congestion),
  • itchiness and irritation of your eyes, nose and throat,
  • facial pain, and
  • headache.

The late phase

The late phase symptoms of indoor allergy are similar to those of the early stage, except that less sneezing and itching occurs. The symptoms of nasal congestion also get worse and you may find yourself producing a lot of mucus.

In a small number of people, the nasal congestion associated with indoor allergy is so severe that they lose some of their sense of taste and smell. The late phase can persist for hours or days.

Over time, repeated allergic reactions can lead to more generalised symptoms such as:

  • fatigue,
  • feeling very sleepy, and
  • a general sense of feeling unwell.
Medical Review: January 13, 2010
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