1 Poison ivy, poison oak, and poison sumac are plants than can cause an itchy rash upon contact. 2  A substance called urushiol, found in these plants, causes the rash. 3  The rash is not contagious.  The rash usually disappears in one to three weeks.
Common factors that can cause clogged ears are wax buildup, air flow blockage to the Eustachian tubes, pressure differences in the middle ear, and cold and sinus problems. Clogged ears can affect people of all ages, but is most common among children, especially when they have colds.
Clogged sinuses can mean more than a stuffy nose. You can also have pain, dizziness, and that muffled-ear sensation, like youâre in a descending plane. You can take steps to relieve your ears once you know what the problem is, though. Your sinuses and ears are connected inside your head.