Earwax or even a piece of hair could be lying on top of the eardrum and when the eardrum vibrates, it may cause funny noises (just like a piece of string on a lightly beating drum). Obviously, treatment is by removal. Eustachian Tube Dysfunction can also cause crackling/popping noises.
Adverse Reactions to Elemental Iron Supplements Meeting your daily iron recommendation is important, and you may have to take supplements to get what you need. Iron's primary function is carrying oxygen through your blood and delivering it to cells, tissues and all of your organs.
Iron also helps your muscles store oxygen to fuel muscle contractions, and promotes healthy circulation so that your muscles can get additional oxygen from your bloodstream. Men need 8 milligrams of iron each day to prevent a deficiency, according to the Linus Pauling Institute, while women need 18 milligrams.