You have these sudden attacks of itchiness, asthma, sneezing, coughing, rashes and red spots all over your body, chances are, you are allergic to something. Common allergies and their symptoms can manifest anytime and anywhere so if you have allergic reactions to some types of foods, smell, pollen and others, you need to be very careful and avoid your allergy triggers. Note that some common allergies and their symptoms can cause some complications in your body. Once medical complications happen, danger comes in. To help you understand common allergies and their symptoms, read on.Common allergies and their symptoms can be broadly categorized into outdoor and indoor allergy triggers. Both outdoor and indoor allergies can make your life really miserable so be aware of the things that could trigger your allergic reactions. For instance, the most common allergies and their symptoms may be caused by different kinds of pollen. Pollen may come from trees, weeds, grasses and shrubs.Technically, pollen is a harmless powdery substance that is emitted by the male plants into the air to pollinate the female plants. In other words, pollen is necessary to make plants grow and bear fruits. Unfortunately, there are people who are allergic to this stuff. Since is made up of very tiny particles and can be inhaled by a person, a person who is allergic to this stuff may suffer from different forms of allergies and symptoms.In most cases, people who are allergic to pollen will suffer from asthma, allergic rhinitis and others. The weather also contributes much to the degree of the sufferings of those people who are allergic to pollen. According to experts, humidity will amplify the allergic reactions of the person. Since the pollen could become trapped in the moisture, it will stay longer in the air and cause more sufferings to people who are allergic to it. During humid conditions the impact of common allergies and their symptoms could magnify, causing the sufferer to feel extremely uncomfortable.On the other hand, while the outdoor allergens may be seasonal, indoor allergens can be an all year round bother. People who are living in windowless apartments and those who are living in polluted areas are especially prone to common allergies and symptoms. Molds and mites are usually the culprit. Since the air in the windowless apartment is recycled, allergens are trapped inside the apartment thus the sufferer may experience an all year round coughing and sneezing.