Perhaps the most important part of the survey process is the creation of questions that accurately measure the opinions, experiences and behaviors of the public. Accurate random sampling and high response rates will be wasted if the information gathered is built on a shaky foundation of ambiguous or biased questions.
However, if you have pollen, fiber, food or other allergies then swollen tonsils might occur alongside other familiar symptoms. In some cases this will subside after a few hours. However, if your allergy triggers a serious reaction, it may swell the tonsils and throat to a point where they restrict breathing.
Herpes infections can lodge in the tonsils. It would be unusual to have herpes in just one tonsil, at least for very long. Leukemia can cause swelling, more typically of both tonsils, but occasionally of just one. The more serious problems that are associated with swelling on just one side of the next are far less common, but treatment is more urgent.