Cold symptoms tend to develop gradually, while flu symptoms can come on suddenly, without warning. (2) RELATED: Learn More About the Differences Between a Cold and the Flu The signs that you have a cold usually develop slowly. The most common cold symptoms include fatigue, sore or scratchy throat, nasal congestion or stuffiness, and a runny nose, followed by sneezing and coughing. Fever is not typical with a cold, but a low-grade fever isn’t out of the question. (3) The mucus discharged by a runny nose may change color over the course of the illness, starting out clear and becoming thicker, yellow, or green. Postnasal drip, in which mucus accumulates or drips in the back of the throat, can further aggravate a sore throat or cough. (1) Symptoms usually disappear in 4 to 10 days, although a cough often lasts into the second week. (3) A cold may last longer or be more severe in people who have chronic health issues. (1) “Fever is an important sign,” says Norman Edelman, MD, a professor of medicine at the State University of New York at Stony Brook. Adults with a fever of 102 degrees F or higher and children with a fever of 103 degrees F or higher should see a doctor. The contagious period for the common cold has its own life span. A cold is most contagious during the first day or two after symptoms develop. (3). RELATED: 7 Home Remedies to Stop a Bad Cough The first signs of the flu are often a fever or chills, accompanied by headache, sore throat, dry cough, runny nose, muscle aches, and fatigue. (2) As the illness progresses, a person may have warm, flushed skin, watery or bloodshot eyes, a severe cough that produces phlegm, and nasal congestion. Nausea and vomiting may also occur, especially among children. (4) A bout of the flu typically lasts for several days or occasionally weeks, with severe symptoms subsiding in two to three days. However, weakness, fatigue, dry cough, and a reduced ability to exercise can linger for six to eight weeks. (4) An adult infected with influenza may be contagious from one day before symptoms start until five to seven days after becoming sick. Children may continue to be contagious for longer than seven days, according to the CDC. (2) Staying home until your contagious period has likely passed will help you avoid passing germs on to other people. Other simple steps can keep you from spreading infection to others or picking up a virus from other people around you at school, work, or at home. Covering your mouth and nose when coughing or sneezing, using tissues to contain respiratory secretions, and in certain cases wearing a mask are also effective, according to the CDC. “It’s really basic public health practices,” says Catherine Troisi, PhD, an associate professor at the University of Texas School of Public Health in Houston. “You should wash your hands, stay home if you’re sick, get enough sleep, and eat well.” Signs of severe complications that should prompt you to seek medical attention include the following, according to the CDC (6):
Difficulty breathing or shortness of breathPurple or blue discoloration of the lipsPain or pressure in the chest or abdomenHigh feverSudden dizzinessConfusionSevere or persistent vomitingSeizuresFlu-like symptoms that improve but then return with fever and worse cough
Even in healthy people who don’t develop complications, the flu can cause symptoms that persist for weeks, including:
FatigueWeaknessLow appetiteDry coughAirway irritation that affects how long you can be activeLoss of sense of smell, which in rare cases becomes permanent (6)
RELATED: 8 Simple and Natural Ways to Boost Your Immune System With the flu, however, immunity doesn’t last that long. A 2017 study confirmed that immunity declines over the months following vaccination or infection. (7) Getting vaccinated every year is important to lower your likelihood of getting the flu, not only because of waning immunity prior to flu virus exposure, but also because of ongoing viral mutations, according to the CDC. It takes about two weeks to develop immunity to the flu, and experts recommend getting vaccinated before flu season is in full swing to ensure adequate protection. (4) “I think part of the problem with getting people vaccinated is people don’t understand how serious [the flu] can be,” says Dr. Troisi. “They confuse it with the common cold. But if you actually have the flu, you can get very sick.”
When Is Cold and Flu Season?
While it’s possible to get the flu year-round, most people get sick in the fall and winter. Flu season generally peaks between December and February, and can sometimes stretch into May. (8) Most people get colds in the winter and spring, according to the CDC, but it’s possible to catch a cold in the summer or fall too. (1) RELATED: No Flu Shot and Now You Have the Flu: What to Do?
Can the Same Home Remedies and Medicine Be Used for Both Cold and Flu?
There is no cure for a cold, the CDC says — it will get better on its own. (1) But prescription antiviral drugs may help with the flu, especially when taken within two days of the onset of symptoms. People with health conditions such as asthma, diabetes, or heart disease that put them at high risk for flu complications should seek treatment right away. (9) While these medications usually only shorten the duration of the illness by about one day, the CDC notes that they may also reduce the probability of serious flu complications like pneumonia. As for home remedies, there is evidence that zinc, taken by mouth in the form of lozenges, tablets, or syrups, can help reduce the length of colds if taken within 24 hours of the onset of symptoms, according to the National Center for Complementary and Integrative Health (NCCIH). The NCCIH adds that zinc can cause nausea and gastrointestinal issues, and that it can interact with other medication, such as antibiotics. (10) There is no strong scientific evidence that any natural product can cure the flu, says the NCCIH. (10) Over-the-counter options like acetaminophen (Tylenol) and nonsteroidal anti-inflammatory drugs like ibuprofen (Advil) are effective treatments for fever and aches caused by either a cold or the flu. People with either illness should also be sure to rest and drink plenty of fluids. (3,4) Additional reporting by Pamela Kaufman.
