If allergies are making your life unbearable, it could be the microbes in your gut.   Typically a healthy body can resist pathogenic attacks on a daily basis. When we have chronic symptoms such as allergies, our body is telling us there is a problem.  I hear this following statement from people all the time in regards to allergies and their habitual use of OTC allergy medications "my doctor said I'm just more susceptible to pollen" But why? Why is your condition now chronic? The Study Scientists from the University of Michigan Medical School presented findings from studies involving mold and laboratory mice. Results showed that antibiotics might be responsible for producing changes in microbes in the gastrointestinal tract, which in turn could impact the way the immune system responds to common allergens in the lungs.  They claim antibiotic use eliminated bacteria in the gut, which enabled fungi to take control until the bacteria grew back after antibiotics use was disc