A clogged ear sensation can be painless or causes any discomfort; it is annoying when your ear is ringing, and you hear a muffled sound.
Possible cause of clogged ear are:
1) Eustachian tube blockage
2) Higher altitude
3) Ear wax
4) Acoustic neuroma (It's a benign growth that develops on the cranial nerve leading from the inner ear to the brain)
You should see an ENT doctor if you cannot attend unclog your ear with home remedies; ENT doctors are required for manual wax removal.