Hundreds of different viruses can infect the respiratory system and cause colds and the flu. The respiratory system is your throat, sinuses, windpipe (trachea) and lungs. Symptoms such as runny nose, sneezing, sore throat, head congestion and cough can also be caused by allergies.
The immune system overreacts to the allergen by producing Immunoglobulin E (IgE) antibodies. These antibodies travel to cells that release histamine and other chemicals, causing an allergic reaction.
Except for some rare immune system diseases, most people are not more susceptible to catching virus infections. So while a rare disease is a possibility with you, I think it is unlikely.
Some people are more susceptible to allergies. Many people are allergic to things that are in outdoor or indoor air, such as pollen, dust, molds, or dander from household pets. I see lots of patients who think they have a cold, but it turns out they have allergies.