The itchy sensation in the left ear of a patient in life portends several problems: first, there is a high probability of fungal infection, often with low body resistance, for example, patients with diabetes, severe anemia or leukemia often have a strange itchy symptom inside the ear that is unbearable. Secondly, if there is a lot of cerumen inside the ear and it is not cleaned regularly, the itchiness inside the ear may also occur, but it is tolerable. Third, the ear may have eczema, often caused by working in a hot or humid environment. No matter which of the above causes the itchiness in the left side of the ear, it is best to go to the hospital for a detailed examination before further symptomatic treatment, and the patient’s itchiness will definitely improve.