Seasonal flu symptoms typically dissipate within one to two weeks of onset, according to Flu.gov. Adults are generally contagious one day prior to the onset of symptoms and for five to seven days once symptoms develop. Individuals with lowered immunity and children may be contagious for longer periods of time.
It is important for individuals with flu symptoms to consult with a physician as there are medications available that can help shorten the overall length of the flu if taken within 48 hours of symptom onset, according to WebMD. Home treatments for seasonal flu include nasal decongestant medications, steam treatments and increased intake of fluids.