Allergic reactions are a common medical condition that affects millions of people each year. People with allergies have immune systems that will overreact to certain substances, causing itchy skin, runny eyes, and breathing problems. To prevent an allergic reaction, people with allergies must take all necessary precautions to avoid the things that trigger them. Air travel is a common source of allergic reactions due to dust, mold, animal dander, and other airborne allergens. However, there is no set limit on how often you should get your allergies and asthma checked. Doctors will recommend an annual allergy checkup appointment for people that suffer from severe allergies, but those with milder conditions can get by, by visiting their allergists less frequently. Allergic reactions can happen at any time of the year. However, spring and summer are the most common times of year for airborne allergies to emerge. People with spring allergies often experience an outbreak within the first few weeks of the new season. In addition to dust, mold, and tree pollens, dust mites are common culprits in springtime allergy attacks. Both animal and insect dander also cause serious symptoms at this time of year. After the Spring season ends, Summer may bring even more dramatic changes to the environment for insects and animal dander. Many people will experience an allergic reaction during these months; however, some can experience a persistent condition even after their summer vacation has ended.