Increased basophil ratio may cause symptoms of allergic reactions, infections and hyperhistamine syndrome. 1. Symptoms of allergic reaction: some patients with high basophil ratio may be caused by allergic reaction, such patients may have symptoms of allergic reaction such as redness of the skin, itching of the throat, runny nose, sneezing and tearing of the eyes. 2. Symptoms of infection: some patients with high basophil ratio may be caused by infection, and such patients may have symptoms of infection such as cough, fever, body discomfort and skin redness. 3. Hyperhistamine syndrome: Basophils are involved in hypersensitivity reactions and can release basophilic particles such as histamine, and their high ratio can lead to hyperhistamine syndrome in some patients, which manifests itself in fever, tachycardia, hypotension and other symptoms. Patients should not rely on one test result to judge a particular disease, and it is still recommended to go to the hospital and cooperate with the physician for further diagnosis and treatment.