Itching inside the ears due to colds is mainly caused by a decrease in the body’s resistance to invasion by pathogens such as viruses, bacteria, mycoplasma, rickettsiae, and even fungi, resulting in an inflammatory reaction in the mucous membrane of the upper respiratory tract, which spreads to the ear canal through the eustachian tube and causes eustachian tubeitis and catarrhal otitis media, so the symptoms of itching in the ears can occur. If it is caused by bacterial infection, you can choose to use hydrogen peroxide to flush the ear, and order anti-inflammatory ear drops, such as oxyfloxacin ear drops, and give antibiotics such as penicillin, amoxicillin and clindamycin by oral or intravenous drip.