What Are the Symptoms of an Allergic Reaction?
In daily life, symptoms such as sneezing or skin itching often occur. In fact, these discomforts are likely to be allergic reactions. Allergy is a series of physical discomfort reactions caused by the immune system. The manifestations of allergy are also easy to judge. For instance, the most common one is the appearance of red spots on the skin, accompanied by itching. Hives are characterized by the sudden appearance of pink wheals of varying sizes, mostly round, oval, or irregular in shape, which can occur on any part of the body. Initially, they may be isolated or scattered, but gradually expand and may merge into patches. Hives often come and go quickly, with new wheals occurring successively, even superimposing on the old ones. Some patients may experience gastrointestinal involvement, resulting in mucosal edema and clinical manifestations such as abdominal pain and diarrhea. If the laryngeal mucosa is involved, respiratory difficulty may occur. Severe cases may be accompanied by palpitations, irritability, nausea and vomiting, respiratory difficulty, laryngeal edema, and even allergic shock manifestations such as hypotension. Allergic rhinitis is mostly the result of the interaction between inhaled allergens and the nasal mucosa of patients, who are often allergic and have a genetic predisposition. Clinically, it can be roughly divided into two types: seasonal rhinitis and perennial rhinitis. The former is mostly caused by inhaling pollen, while the latter is mostly caused by inhaling indoor dust, mites, mold, animal hair, dander, and feathers of birds. The clinical manifestations include sudden nasal itching, continuous sneezing (more than 5 times), and a large amount of clear watery nasal secretions. Each episode usually lasts for more than an hour and often recurs.
