Allergies are typically a symptom of gut dysfunction or the need for a liver detox. When one of your channels of elimination is not functioning at optimum, it can clog the drainage funnel, causing a back-up with the liver. Bowel, liver/kidney, and lymph are at the bottom end of this funnel (listed from the bottom up).
Think of the liver like a bucket. If the bucket is only ¼ full, and you add additional toxins to that bucket, no problem! But if the bucket is full, a small amount will cause it to overflow into the bloodstream, resulting in a histamine response. Allergies.