There are several reasons you might find your ear is clogged. Here are a few of them with some suggestions of what to do about it.
You've got a cold. When someone has a cold they get inflammation in their nasal passages. The soft tissues swell up because of the viral infection. The viruses create substances which trigger the body to release inflammatory chemicals. These make the tiny blood vessels leaky and they ooze fluid into the surrounding tissues. Try an anti-inflammatory and decongestant from the chemist. If your ear is painful you should visit your doctor as you may have an ear infection which needs treatment.
You've got too much ear wax. Impacted ear wax can really clog up your ears. The ear usually cleans itself. Using ear buds incorrectly in the canal pushes the wax back up. It builds up against the drum and dries. This can reduce your hearing and you will find that your ear is clogged. This may get worse if you get water in your ear as the water soaks the wax and gets behind it. Try warm olive oil or drops from the chemist. The wax might then come out on it's own but you still might need it suctioning.
You've got glue ear. When your middle ear is full of fluid you might feel like your ear is clogged. This tends to be more of a problem for children. This is because their Eustachian tubes tend to be narrower. They tend to become clogged with mucus more easily. Glue ear consists of a mucus fluid which builds up as a result of Eustachian tube dysfunction. Sometimes it becomes infected and antibiotics are required. If it is a problem for some time a grommet may be inserted by an ear specialist. If deafness is the main problem then hearing aids may be used instead.
Summary. There are several reasons your ears may be clogged. Some may be treated easily at home but it is important to visit a doctor if your ear is painful or doesn't settle quickly.
Dr Toby Bateson, MD of ZenPlugs