Children with frequent nosebleeds can undergo physical examination, blood tests, olfactory function tests, nasal secretion tests, nasal endoscopy, imaging tests, etc., to assist in the diagnosis of disease etiology. 1. Physical examination. This is to determine whether there is swelling, infection, defect, ulcer, deformity, etc. by observing the bleeding spots in the nasal cavity. 2. Blood examination. Including routine blood test, can clarify whether there is anemia, and the severity of anemia, etc.; blood biochemistry test, can determine whether there is inflammation in the body, and assess the liver and kidney function; coagulation test, can clarify whether there is coagulation dysfunction; platelet aggregation test, can determine whether the function of platelets is normal. 3. Olfactory function examination. It can assess whether the olfactory function is normal and clarify whether there is any damage to nerve transmission. 4. Nasal secretion examination. The shape, odor, and composition of nasal secretions can be examined to determine whether they are abnormal and to clarify whether pathogenic bacteria or cancer cells are present. 5. Nasal endoscopy. Observe the depth of nasal cavity through catheter, if there is corresponding lesion, it can be directly observed and local lesion tissue can be captured for subsequent tissue biopsy. 6. Imaging examination. Including ultrasound, CT, MRI examination, etc., to determine whether there are lesions in the nose and surrounding tissues, and to assess the scope and severity of the lesions. It is recommended that people with unusually frequent nosebleeds should consult the doctor in time for the appropriate examinations, so as to clarify the cause of the disease and diagnosis.