30-year-old man suddenly buzzing in the left ear is mostly seen in mental psychological factors, secretory otitis media, Meniere’s disease, sudden deafness. 1. Psychological factors: may be due to excessive mental tension, excessive pressure or a long time to stay up late, on the nerve function caused by certain effects, thus causing tinnitus symptoms, feel the ears buzzing. 2. Secretory otitis media: it may be caused by viral or bacterial infections, which can lead to middle ear infections caused by poor circulation of middle ear exudates, and sometimes you may feel your ears buzzing. 3. Ménière’s disease: the cause of the disease is still unclear, it may be related to the imbalance of endolymph production and absorption, the symptoms manifested as episodes of vertigo, tinnitus, ear swelling and fullness. 4. Sudden deafness: the cause is not clear, generally manifested as a sudden onset of hearing loss, often accompanied by ear boring, tinnitus, vertigo, nausea and other symptoms. 30-year-old man suddenly buzzing in the left ear may also be caused by other reasons, it is recommended to consult a doctor in a timely manner to clarify the cause of targeted treatment.