Anyone experiencing symptoms such as a stuffy nose, sneezing, shortness of breath, watery or itchy eyes, coughing, skin rashes, fatigue, or headaches should consider this test.Many people suffer from allergies without knowing it, and allergy symptoms can be similar to common cold ...Anyone experiencing symptoms such as a stuffy nose, sneezing, shortness of breath, watery or itchy eyes, coughing, skin rashes, fatigue, or headaches should consider this test.Many people suffer from allergies without knowing it, and allergy symptoms can be similar to common cold symptoms, so it can be difficult to tell them apart. In fact, allergies are the sixth leading cause of chronic illness in the United States, with more than 50 million Americans experiencing various types of allergies a year. Although pollen and pet dander tend to be among the most well-known and prevalent allergy triggers, there are many other allergens to watch out for—including molds and household pests.If you have a known allergy and are on an immunotherapy treatment plan, retesting for allergies can also help you see if your IgE levels have decreased over time.