If you have the flu, the most important steps are to rest, stay hydrated, manage your fever, and figure out whether you need prescription antiviral medication. Most healthy adults recover at home within a week without medical treatment. But acting quickly in the first 48 hours can shorten how long you feel sick, and knowing which symptoms are red flags can keep a routine illness from becoming dangerous.
Decide Whether You Need Antivirals
Prescription antiviral medications can shorten the flu by about a day and reduce the risk of complications, but they work best when started within 48 hours of your first symptoms. That means the clock starts ticking as soon as you notice that sudden wave of body aches, fever, and fatigue. If you fall into a higher-risk group, call your doctor right away rather than waiting to see if you improve on your own.
You’re considered higher risk if you are 65 or older, pregnant (or up to two weeks postpartum), or have a chronic condition like asthma, diabetes, heart disease, kidney disease, liver disease, or a weakened immune system. Children under 2 carry the highest risk of serious complications among kids, with the greatest hospitalization rates in infants under 6 months. A BMI of 40 or higher, a history of stroke, and conditions that affect your ability to cough or clear your airways also put you in this category.
If you’re otherwise healthy and your symptoms are manageable, you likely don’t need antivirals. But if you’re in a risk group, don’t wait for a test result to call your doctor. They can prescribe antivirals based on your symptoms alone during flu season. Even starting treatment after the 48-hour window still offers some benefit for people at high risk or those sick enough to be hospitalized.
Managing Symptoms at Home
Fever, headache, and muscle aches respond well to over-the-counter pain relievers. Acetaminophen and ibuprofen are both effective. If you’re using acetaminophen, stay under 4,000 milligrams in a 24-hour period, and be aware that many combination cold and flu products already contain it. Doubling up without realizing it is one of the most common medication mistakes during flu season. Never give aspirin to anyone under 19 with the flu, as it’s linked to a rare but serious condition affecting the brain and liver.
A fever is your body’s way of fighting the virus, so you don’t necessarily need to eliminate it entirely. Treat it when it’s making you miserable or keeping you from sleeping and drinking fluids.
Why Hydration Matters More Than You Think
Fever causes you to lose fluids faster than normal through sweat and increased breathing rate. Add in reduced appetite and the occasional bout of vomiting or diarrhea, and dehydration becomes a real concern. Dehydration also thickens mucus, making congestion worse and coughs less productive.
Water is your foundation, but when you’re running a high fever or have diarrhea, you’re also losing electrolytes. Commercial rehydration solutions contain the right balance of water, sugar, and mineral salts to help your body absorb fluids efficiently. If you don’t have one on hand, you can make a simple version: mix 12 ounces of unsweetened orange juice with 20 ounces of cooled boiled water and half a teaspoon of salt. Take small, frequent sips rather than gulping large amounts, especially if nausea is an issue. For adults with diarrhea, aim for about 100 to 240 milliliters of rehydration solution after each loose bowel movement.
Broth-based soups pull double duty here. They deliver fluids and electrolytes while being easy on a churning stomach.
Rest Is Not Optional
Your immune system burns enormous energy fighting the flu virus. Sleep and rest aren’t just about comfort. They directly support the immune response that clears the infection. Cancel your plans for a few days. Trying to power through often extends how long you’re sick and increases the chance of complications like pneumonia.
Keep your bedroom cool and use an extra pillow to elevate your head if congestion or coughing is disrupting sleep. A humidifier can help keep nasal passages moist and ease breathing.
When You’re Contagious
You’re most contagious during the first three days of illness, but you can spread the virus starting a full day before symptoms appear and for five to seven days after getting sick. Young children and people with weakened immune systems may be contagious even longer. The general guidance is to stay home until you’ve been fever-free for at least 24 hours without using fever-reducing medication.
While you’re sick, cover coughs and sneezes, wash your hands frequently, and try to isolate yourself from other household members when possible. Wipe down shared surfaces like doorknobs, light switches, and bathroom faucets. If someone in your home is in a high-risk group, this matters even more.
Warning Signs That Need Emergency Care
Most flu cases resolve on their own, but certain symptoms signal that something more serious is happening. In adults, get emergency medical care if you experience difficulty breathing or shortness of breath, persistent chest or abdominal pain, confusion or dizziness that won’t go away, seizures, an inability to urinate, or severe weakness. A fever or cough that seems to improve and then suddenly returns or worsens is a particularly important red flag, as it can indicate a secondary bacterial infection like pneumonia.
In children, watch for fast or labored breathing, ribs pulling inward with each breath, bluish lips or face, refusal to walk due to severe muscle pain, or signs of dehydration like no urine for eight hours, a dry mouth, or no tears when crying. Any fever in an infant under 12 weeks warrants immediate medical attention. A fever above 104°F that doesn’t respond to medication also requires urgent care.
Watch for Secondary Infections
The flu weakens your respiratory defenses, which makes it easier for bacteria to move into your lungs and cause pneumonia. This is the most common serious complication and the main reason flu can become life-threatening. The classic pattern is that you start to feel better after several days, then take a sharp turn for the worse with a new or higher fever, worsening cough, shortness of breath, or chest pain.
Pay attention to what you’re coughing up. Clear or white mucus is typical of a viral infection. Yellow, green, or bloody mucus, especially paired with chest pain when breathing deeply, suggests a bacterial infection that needs antibiotics. Bacterial pneumonia is generally more severe than the viral type and won’t resolve on its own. If your symptoms follow that “getting better then getting worse” trajectory, contact your doctor promptly rather than assuming it’s just a lingering flu.
A Day-by-Day Timeline
Days 1 through 3 are usually the worst. Fever, chills, body aches, headache, and extreme fatigue hit hard and often all at once. This is when you’re most contagious and when antivirals are most effective if you need them. Focus on rest, fluids, and fever management.
Days 4 through 5, fever typically starts to break and body aches ease, but fatigue and cough often linger. Don’t mistake feeling slightly better for being recovered. This is the window where pushing yourself too hard or ignoring a returning fever can lead to complications.
Days 6 through 10, most symptoms have resolved, though a dry cough and general tiredness can hang on for two weeks or more. Ease back into your routine gradually. If your cough is worsening rather than improving by day 10, or if you develop new shortness of breath, that warrants a call to your doctor.