With the arrival of spring, some changes occur in nature. One of these changes is the pollen that is released into the air and spread by the wind for the fertilization event seen among the plants of the same species. Pollen is colloquially known as pollen. These pollens are more intense in April-June. Pollen allergy negatively affects the work and school life of many people.Substances that cause pollen allergies are the pollen of many plants, such as trees, shrubs, grasses, cereals, herbs and (less often) flowers. Pollen allergies can trigger the following symptoms:Nose: Sneezing, sneezing, rhinitis (swelling of the nasal membranes, nasal congestion, and difficulty breathing) Eyes: Itching, redness, watering, swelling (conjunctivitis) Respiratory System: Cough, phlegm breathing (bronchitis), acute respiratory distress, asthmaSkin : Itching and irritation (eczema, hives, neurodermatitis) Digestive System (Rarely): Gas, nausea, diarrhea, vomiting, abdominal painHead: MigrainePollen allergies are called respiratory allergies because we get pollen with the air we breathe. They are classified according to the times of the year when the highest pollen counts occur:Early bloomers (e.g. alder and hazelnuts) Spring blooms in summer (e.g. birch, beech, herbs) Summer blooms (e.g. herbs and cereals) late bloomers (e.g. wormwood and nettle)Flowering periods, as a rule, are between December and October. In addition to full bloom periods, individual pollen seasons and problems caused by pollen depend entirely on climatic and regional factors.