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.
Â· Twisted Artery: Another common cause of rushing sound in the ears is a twisted artery in the neck leading to a restricted blood flow. This leads to a build-up of pressure as the blood pushes a path through the vein. This can also be caused by a clogged artery that may need minor surgery to put right.