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Influenza(Flu): Symptoms, Causes, Types, Treatment, Diagnosis

About – 

The flu, short for influenza, is a contagious respiratory illness caused by the influenza virus. There are several types of influenza viruses, including types A, B, and C, and within type A there are different subtypes such as H1N1 and H3N2.

The flu is typically spread through the air when an infected person coughs or sneezes, and it can also be transmitted through contact with contaminated surfaces. Symptoms of the flu can include fever, cough, sore throat, runny or stuffy nose, body aches, headache, chills, and fatigue. These symptoms can range from mild to severe, and in some cases, complications such as pneumonia can develop, which can be life-threatening.


The best way to prevent the flu is to get an annual flu vaccine, which is typically available starting in the fall. Other preventative measures include washing your hands regularly, covering your mouth and nose when coughing or sneezing, avoiding close contact with sick people, and staying home if you are feeling unwell. If you do get the flu, treatment may include rest, fluids, and over-the-counter medications to manage symptoms, and in some cases, antiviral medications may be prescribed by a healthcare professional.

Symptoms –

The symptoms of the flu can vary in severity and can be similar to those of a cold. Common symptoms of the flu include:

  1. Fever or feeling feverish/chills
  2. Cough
  3. Sore throat
  4. Runny or stuffy nose
  5. Muscle or body aches
  6. Headaches
  7. Fatigue (tiredness)
  8. Vomiting and diarrhea (more common in children than adults)

It’s important to note that not everyone with the flu will experience all of these symptoms, and some people may have symptoms that are more severe than others. Additionally, some people with the flu may not have a fever. If you are experiencing any of these symptoms and suspect that you may have the flu, it is important to seek medical attention, especially if you are in a high-risk group for complications, such as young children, older adults, pregnant women, and people with certain medical conditions.

Causes –

The flu is caused by the influenza virus, which is a highly contagious respiratory virus. There are several strains of the influenza virus, including types A, B, and C. Influenza A viruses are further classified into subtypes based on the combination of two proteins on the surface of the virus: hemagglutinin (H) and neuraminidase (N). Influenza B and C viruses do not have subtypes.

The flu is typically spread from person to person through respiratory droplets when an infected person talks, coughs, or sneezes. These droplets can land in the mouths or noses of people nearby, or be inhaled into the lungs. It’s also possible to contract the flu by touching a surface contaminated with the virus and then touching one’s own nose, mouth, or eyes.

The influenza virus can be highly contagious and easily spread in crowded places, such as schools and workplaces, during the flu season, which usually occurs from late fall to early spring. Certain groups of people, such as young children, older adults, pregnant women, and those with weakened immune systems or underlying medical conditions, are at a higher risk of complications from the flu.

Types –

There are three types of influenza viruses that cause human illness: influenza A, influenza B, and influenza C.

Influenza A: This type of flu virus is the most common and has the potential to cause widespread outbreaks, including pandemics. Influenza A viruses are further categorized into subtypes based on the combination of two surface proteins: hemagglutinin (H) and neuraminidase (N). The H1N1 and H3N2 subtypes are currently circulating in humans.

Influenza B: This type of flu virus is less common than influenza A and tends to cause less severe illness. Influenza B viruses are not categorized into subtypes.

Influenza C: This type of flu virus causes milder respiratory illness and does not cause widespread outbreaks or pandemics. Influenza C viruses are not categorized into subtypes.

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It’s important to note that the flu virus can mutate rapidly, which means that new strains can emerge each year. This is why flu vaccines need to be updated annually to protect against the strains that are expected to be most common during the upcoming flu season.


Treatment –

The treatment of the flu typically involves managing symptoms and allowing the body to fight off the infection. Here are some common approaches to treating the flu:

  1. Rest: Getting plenty of rest is important to help the body fight the infection and conserve energy.
  2. Fluids: Drinking plenty of fluids, such as water, juice, or warm broth, can help prevent dehydration and loosen mucus.
  3. Over-the-counter medications: Over-the-counter pain relievers, such as acetaminophen or ibuprofen, can help reduce fever and relieve muscle aches and headache. Decongestants and cough suppressants can also help relieve symptoms.
  4. Antiviral medication: Antiviral medications, such as oseltamivir (Tamiflu) or zanamivir (Relenza), can be prescribed by a healthcare professional to treat the flu. These medications work by preventing the virus from multiplying in the body and may shorten the duration of symptoms and reduce the risk of complications. Antiviral medications are most effective when started within the first 48 hours of symptoms.

It’s important to note that antibiotics are not effective against the flu, as it is caused by a virus and not bacteria. If you have the flu and are experiencing severe symptoms, such as difficulty breathing or chest pain, seek medical attention immediately, as these may be signs of a more serious complication, such as pneumonia.

Diagnosis –

  • The diagnosis of the flu is usually made based on a person’s symptoms and physical examination. A healthcare provider may suspect the flu if the person has a sudden onset of symptoms, such as fever, cough, sore throat, body aches, and fatigue, especially during the flu season.
  • To confirm the diagnosis, a healthcare provider may perform a rapid flu test, which involves swabbing the nose or throat to collect a sample of respiratory secretions. The sample is then tested for the presence of the influenza virus. Results from a rapid flu test are usually available within a few minutes.
  • In some cases, a healthcare provider may recommend a more sensitive flu test, such as a PCR (polymerase chain reaction) test, which can detect the presence of the flu virus with greater accuracy. This test may take longer to produce results, typically several hours to a few days.
  • It’s important to seek medical attention if you suspect that you have the flu, especially if you are in a high-risk group for complications. Early diagnosis and treatment with antiviral medication may help reduce the severity of symptoms and prevent complications.