(Concern) Why do I experience a feeling of fullness or muffled hearing in my ears??

I go hiking in the nearby mountains every weekend for my health.

Mountains near Seoul - Bukhansan, Inwangsan, Bugaksan, Sapaesan, Dobongsan, Buramsan, Suraksan, etc... I go to all the mountains that are considered somewhat high.

When I start hiking and feel a little tired, the symptoms of ear congestion begin to occur.

Symptoms that occur when flying and the altitude increases... You know, right?

Except for Bukhansan, it's not a very tall mountain... Even at an altitude of around 500 meters, such symptoms can occur.

Moreover, such symptoms occasionally occur even when riding.

I think those symptoms appear when I feel a little tired.

I looked it up on Naver, and it said that if you experience such symptoms, you should definitely visit an otolaryngologist.

Is it really a bad symptom?

I haven't been to the hospital yet... Should I go?