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Why is the immune system important? 

The immune system of our body or as we should say ‘the defense mechanism’ of our body constantly fights against pathogenic microbes and harmful bacterias that penetrate our body in numerous ways. It has cells that are specialized to kill infecting microbes while keeping our body healthy. In simple words, If you didn't have a functioning immune system, simply brushing your teeth would introduce enough harmful bacteria into your bloodstream to kill you. Luckily, your immune system protects you from these very common, everyday bacteria. For example, HIV is a disease that destroys the immune system of the host due to which the body of the host is extremely vulnerable to diseases. The body loses its potential to fight against those viruses and bacterias which ultimately results in death.

So we can simply say that it is our immune system that keeps us healthy as we drift through a sea of pathogens. This vast network of cells and tissues is constantly on the lookout for invaders, and once an enemy is spotted, a complex attack is mounted.
The immune system is spread throughout the body and involves many types of cells, organs, proteins, and tissues. Crucially, it can distinguish our tissues from foreign tissues i.e. self-tissues from non-self tissues. Dead and faulty cells are also recognized and cleared away by the immune system.
If the immune system encounters a pathogen, for instance, a bacterium, virus, or parasite, it mounts a so-called immune response, thereby attacking the pathogen and protecting your body from various diseases.

Weak immune system VS being sick

And while having a healthy immune system is vital for healthy living, having a weak immune system doesn't necessarily mean that you are sick at the present moment. Weak immune system simply means that the potential of our body to fight against pathogenic microbes and viruses is less as compared to a normal person. Whereas sickness is a state of being ill due to the penetration of infectious viruses and pathogens.

Here are some major signs and symptoms that tell us that your immune system needs attention : 

1. Your Stress Level is Sky-High:
It’s not a coincidence that you tend to get sick after a big project at work or following an emotional situation at home. According to a report by the American Psychological Association, long-term stress weakens the responses of your immune system. “That’s because stress decreases the body’s lymphocytes, the white blood cells that help fight off infection. The lower your lymphocyte levels, the more you’re at risk for viruses like the common cold,” explains Nadia Hasan, DO, a physician at Delancey Internal Medicine.

2. You Always Have a Cold
It’s perfectly normal for adults to sneeze and sniffle through two or three colds each year. Most people bounce back in seven to 10 days. “During that time, it takes the immune system three to four days to develop antibodies and fight off pesky germs,” says Dr. Hasan. But you might want to get your immune system checked if a cold refuses to leave you or makes a return too often. That’s honestly a clear sign that your immune system is struggling to keep up.

3. You Have Lots of Tummy Troubles
Your tummy can tell you a lot about your immune system. If you suffer frequently from diarrhea, gas or constipation, it could be a sign that your immune system is compromised.
Research shows that nearly 70 percent of your immune system is located in your digestive tract. The beneficial bacteria and microorganisms that live there defend your gut from infection and support your immune system. Low amounts of these helpful gut bacteria can leave you at risk of viruses, chronic inflammation and even major auto-immune disorders.

4. Your Wounds Are Slow to Heal
Your skin goes into damage control mode after you get a burn, cut or scrape. Your body works to protect the wound by sending nutrient-rich blood to the injury to help regenerate new skin. This is the basic healing process run by healthy immune cells. But if your immune system is sluggish, your skin can’t regenerate and as a result, wounds will linger longer and have a hard time healing.

5. You Have Frequent Infections