Fluid in the ear is one of the main effects of middle ear infections, or acute otitis media (OM). Ear infections result when fluid (usually pus) is in the inner ear and causes pain, redness of the eardrum, and potentially also a fever. Fluid in the ear, however, can also persist after an infection has dissipated; this is called otitis media with effusion (OME). Ear infections and fluid are more common in small children than adults. Though there are some home remedies for draining ear fluid, in most cases, ear fluid will clear on its own. Moreover, treatment of the underlying cause of the problem is the most important step.