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The flu’s common symptoms of fever, body aches, and fatigue can leave many confined to bed until symptoms subside. Flu symptoms will show up anywhere from one to four days after infection. They often appear suddenly and can be quite severe. Luckily, symptoms generally go away within one to two weeks.
In some individuals, especially those at high risk, the flu may lead to complications that are more serious. Lung inflammation, or pneumonia, is the most common flu-related complication. Pneumonia can be life threatening in high-risk individuals or if left untreated.
The most common symptoms of the flu are:
While most symptoms will taper off one to two weeks after onset, a dry cough and general fatigue can last several more weeks.
Other possible symptoms of the flu include dizziness, sneezing, and wheezing. Nausea and vomiting are not common symptoms in adults, but they sometimes occur in children.
Individuals at high risk for flu complications include those:
People who have weakened immune symptoms due to health conditions or the use of certain medications are also at a high risk.
People at high risk for flu complications should contact their doctor if they experience any flu symptoms at all. This is especially true if you have a chronic health condition like diabetes or COPD.
Older adults and those with compromised immune systems might experience:
You should contact your doctor as soon as possible if flu symptoms:
According to the Centers for Disease Control and Prevention (CDC), adults should seek immediate emergency treatment if they experience any of the following symptoms:
According to the CDC, you should seek medical care immediately if your infant or child has any of the following symptoms:
Pneumonia is a common complication of the flu. This is especially true for certain high-risk groups, including people over 65, young children, and people with already-weakened immune systems. You should visit an emergency room immediately if you have symptoms of pneumonia, including:
Untreated pneumonia can lead to serious complications and even death. This is especially true in older adults, smokers, and people with weakened immune systems. Pneumonia is particularly threatening to people with chronic heart or lung conditions.
An illness commonly known as the "stomach flu" is actually a form of gastroenteritis (GE). GE is an irritation of the stomach lining. The disease can be caused by any number of pathogens, including viruses, bacteria, and parasites.
Common symptoms include mild fever, nausea, and diarrhea. The influenza virus doesn’t typically cause nausea or diarrhea, except sometimes in small children. It’s important to distinguish between the symptoms of regular flu and the stomach flu so you can get proper treatment.
Young children are at higher risk for complications related to untreated GE. These complications can include severe dehydration and sometimes death.
Unlike bacterial infections, the influenza virus is best treated with bed rest. Most people feel better after 24 hours. Fluids, such as the following, are also helpful in treating the flu:
In some cases, your doctor might prescribe an antiviral medication, such as Tamiflu. Antiviral drugs don’t get rid of the flu entirely, but they may shorten the course of the virus. The medications may also help prevent complications such as pneumonia.
Medications for the flu are only offered for individuals who may be at risk for complications. These drugs can carry the risk of side effects, such as nausea, delirium, and seizures. Ask your doctor about taking over-the-counter medications for pain relief, such as ibuprofen (Advil) or acetaminophen (Tylenol).
The best way to avoid flu symptoms is to prevent the spread of the virus in the first place. Anyone 6 months of age and older should get an annual flu vaccination. These are also recommended for pregnant women. While not completely foolproof, the flu vaccine can significantly decrease your risk for catching the flu.
You can also prevent getting and spreading the flu by:
It can take up to two weeks for flu symptoms to completely go away, though the worst of your flu symptoms usually begin subsiding after 24 hours. Talk to your doctor if flu symptoms last longer than two weeks, or if they disappear and then reappear worse than before.
Written by: The Healthline Editorial Team
Medically reviewed on: Jun 14, 2016: Judith Marcin, MD
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