Repeated ear infections, especially in children, can be caused by several factors. These include:

1. Anatomy: Children with shorter and more horizontal Eustachian tubes are prone to fluid buildup and infections.
2. Allergies: Allergic reactions can lead to inflammation and fluid accumulation in the middle ear.
3. Environmental factors: Exposure to smoke, cold weather, or high altitudes can increase susceptibility.
4. Immune system: Weak immune systems or conditions that affect immunity can make individuals more prone to infections.
5. Daycare/school exposure: Increased exposure to viruses and bacteria in group settings can contribute.

Consulting an ENT specialist can help manage and prevent recurrent infections effectively.