How can you tell the difference between allergies and a cold when your nose is running all the time.

Good question: Some time it is hard to tell. In general, when you have a cold, someone else in the family or office often has one. A cold is often associated with a low-grade fever but allergy is not. You may also notice fatigue as well as joint or muscle ache with a cold but not with allergy. Hay fever may respond to antihistamine but a cold does not. If your nose runs all the time it is not from a cold.