Simply, if all immune systems are on full blast, it's instant death. Even a breath of air can kill you.

The body's immunity should be neither too low nor too high. Immunity is the body's most important barrier to defense against foreign invasions from the outside. If there is a problem with this barrier, all kinds of diseases will come. For example, the infamous AIDS virus, HIV, attacks the body's immune cells, CD4T lymphoid immune cells, which are a class of immune cells that the human body ultimately wants, and once they are destroyed by a large number of HIV, the body will lose its immune ability completely. Then all kinds of diseases and even cancer will have no natural enemy and will grow unchecked until the patient dies.

Of course, HIV causes immunodeficiency diseases. On the contrary, if the immune system is too strong, it will cause immune over-excitement, which can lead to a minor illness or direct death. For example, the famous systemic lupus erythematosus is caused by the over-expansion of immune cell B-cells, which produces a large number of autoantibodies and thus combines with some of its own antigens, causing its own severe inflammatory reaction. Similarly, allergic reactions in daily life also occur when immunization should not. Penicillin reactions, for example, can be fatal.

So, if your immune system is on full blast, then well, you eat a meal like penicillin and immediately have an allergic reaction. If you take a sip of water, you react, if you take a breath of air, you react. Everywhere is your allergen, and you can say that you can't live more than half a minute.

Main functions of the immune system

1 Detect and remove foreign bodies to defend against pathogen invasion.

2 Removes senescent, dead, and damaged cells from the body.

3 Repair readily identifies and removes abnormal cells (e.g., tumor cells) produced in the body.

The immune system, if over-activated, may function in such a way as to cause significant damage to its own tissues and organs.

There are many autoimmune diseases that are caused by the immune system not recognizing its "own family" and constantly attacking its "own people", for example:

1 Systemic lupus erythematosusIt manifests as damage to multiple organ systems, which can include fever, facial erythema, arthralgia, alopecia, mouth ulcers, myocarditis, lung lesions, nephrotic syndrome, damage to the nervous, blood, and digestive systems, and more.

2 Rheumatoid arthritisThe lesions attack joints throughout the body causing pain and impaired movement. As the number of episodes increases, the joints become increasingly damaged, eventually leading to varying degrees of dysfunction and deformity.

3 Systemic vasculitisMore common is nodular polyarteritis. The lesions mainly invade medium-sized arteries and small intramuscular arteries, resulting in narrowing of the lumen.

4 OtherUlcerative colitis, Crohn's disease, some hyperthyroidism, Hashimoto's thyroiditis, scleroderma, pemphigus, dermatomyositis, and too many more to list.

An overreaction of the immune system caused by a foreign allergen is what we commonly call an "allergic reaction".

It occurs in the respiratory system and can manifest as asthma, or cough. There are some acute allergies that can manifest as laryngeal edema, airway obstruction, pulmonary edema, and dyspnea.

It occurs on the skin and can manifest as various types of rashes.

Occurring in the digestive system, abdominal pain, diarrhea, and vomiting can occur.

Occurs in the cardiovascular system and can manifest as palpitations, pallor, drop in blood pressure, and anaphylaxis.

Anaphylaxis has been the worst allergic reaction we can encounter. It's been enough to kill a person for tens of minutes.

As you can imagine, if the entire body's immune system is activated at the same time, all of the above symptoms have the possibility of appearing at the same time, and it is enough to kill within a few minutes, even if a doctor is present, it is estimated that there is nothing that can be done to save the life.

Welcome to follow Dr. Cheng's 100 high and focus on the health issues around you.

Feel free to leave a message.

Answer: people will die quickly.

The immune system is like the body's guard of honor, they have three functions, to identify and remove foreign antigens, to clear the body of aged and dead cells and other harmful substances, and to repair damaged organs and tissues to maintain the stability of the internal environment.

An overpowered immune system can trigger overreactions and disease

The most common is the allergic reaction, many people want to sneeze, runny nose and breathing becomes uncomfortable after inhaling the pollen, this is due to the pollen contains some kind of protein is recognized by the human body as an antigen, cause the human body's immune system to overreact and produce a large number of antibodies caused by the human body's immune system, in essence, the human body's immune system is too strong.

A typical example is rheumatic heart disease, which is a disease caused by the immune system causing damage to its own tissues and organs. In layman's terms, it means that when some people with special health conditions are infected by Streptococcus haemolyticus, the immune system makes a mistake and originally only eliminates the Streptococcus bacteria, but the membrane proteins of the bacteria are similar to those of the human heart valve cells, which leads to the immune system attacking even the normal heart cells and triggering rheumatic heart disease.

There is a very rare genetic defect disease "severe combined immunodeficiency disease" (referred to as SCID), this disease patients do not have any immune system in the body, and our daily life, bacteria everywhere, the air and desks are hiding a large number of bacteria, if the human body does not have an immune system, the equivalent of the bacterial viruses If the human body does not have an immune system, it is equivalent to giving bacteria and viruses an open door to the body, and it is possible to die from inhaling a single breath of air.

It follows that both complete activation and complete loss of the immune system can be fatal to the human body.

There are indeed medical examples of such overpowered immune systems that have overreacted leading to an over-attack on themselves, such as systemic lupus erythematosus, a disease caused by attacking itself.

Normally, our immune system recognizes which ones are good and are our own, then peacefully coexist. Which ones are bad and are invaders, then the attack begins to fight. If our immune system is cranked up to its highest level, then it can cause an immune storm, a collective overreaction, where we can't recognize anything as bad, and then we start attacking the good ones, and the bad ones, and ultimately destroying ourselves.

To take the simplest example, allergies. We all know that allergies have allergens, you may be allergic to something in the outside world, and when you come into contact with it, you will have a reaction. But now the immune system is overreacting, you're allergic to contact, you're allergic to no contact, you're allergic to everything, but you can't live in a vacuum! So, with this violent, excessive self-attack, we could hang up very quickly, and the real culprit, is still ourselves 。。。。。。

Here's the thing about this question, the human immune system is actually very delicate. How can we make our immune system capable of helping us to defend ourselves against external harm while at the same time not causing harm to ourselves? The key lies in two things: the immune system is the equivalent of the Praetorian Guard in our body, and we need to control both the strength and the range of his blows. The scope and strength are very important, and if we don't control them well, I'm afraid the guards will rebel.

Allergies are the more common immune system over-sensitization that we know about, so I won't ramble on here. Regarding strength and range, let me give two other examples.

First, strength. There is a disease called acute severe hepatitis (formerly known as fulminant hepatitis), this disease, is due to the virus infected liver cells, parasitized and replicated in the liver cells, and our overpowered immune system in order to get rid of the virus, will frantically attack the infected liver cells, even the liver cells to eliminate, and this decapitation will directly cause large chunks of liver cell necrosis, the The patient's liver will shrink dramatically and then there may be no more.

Second, range. There is also a disease called sympathetic ophthalmia. This is simply an injury to one eye that brings the antigenic tissue in the eye into contact with the lymphatic system, and then the sensitive lymphatic system blindly attacks the other uninjured eye with the same antigens as well, resulting in pain, blurred vision, and even the development of more severe symptoms in the other healthy eye. Such diseases in which the immune system attacks itself are called autoimmune diseases, and in addition to sympathetic uveitis, there are actually many others, such as rheumatoid, lupus erythematosus, and so on, and rheumatic heart disease also belongs to this mechanism. All of these diseases are treated by suppressing the autoimmune system.

So, as we can easily see from these two little chestnuts above, too much power to the immune system can really bother us a lot, not to mention that with the immune system all activated, you might be able to turn into a superhuman in the imagination, but in reality, you might not be able to eat the drops, and you'll solve yourself with the internal friction alone.

Full activation of the immune system is disastrous.

The thing about the immune system is that to fulfill its ultimate purpose (to protect the organism from the threat of foreign invasion) the first thing it has to do is to recognize what is foreign and what is its own thing the second thing is to generate the appropriate level of response to deal a fatal blow to the foreign thing.

So the immune system that has survived evolution has mechanisms for enemy recognition and for regulating the extent of the immune response.

Problems with immune system recognition can lead to generalization of the striking surface or enemy to enemy, indiscriminate strikes.

An overreaction of the immune system can lead to a blow that is too severe and results in impairment of normal functioning. The most common of these are allergies of all kinds, ranging from a mild rash to severe laryngeal edema and anaphylaxis. In some diseases, such as Hepatitis B, the severity of symptoms is the result of a game between the virus itself and the host immune system's response, with severe cases resulting from the virus causing a strong immune response from the host, attacking a wide range of liver cells.

So the immune system is normally activated on demand by various regulations. Once fully activated, it means that it is out of control, and the powerful immune response will mobilize all available resources in the body, frantically expanding itself and attacking all the normal and abnormal cells it encounters until it runs out of resources and the body's normal functioning collapses.

That's why there are degrees of everything, and anything in excess is never good.

Glad to answer your questions~

I'm probably interpreting the phrase "activate the entire immune system" in the title to mean that the immune system has a particularly high level of defense.

The immune system helps the body to defend itself against various bacteria and viruses and protects the body's health, which is indeed very important. However, immunity is not the higher the better, everything is too much, on the immune system is the same reason.

The principle of the work of the immune system is actually summed up appropriately in eight words: expel foreign enemies and exclude dissidents.

The immune system works by turning on the immune response to destroy or reject substances that are foreign and that it believes may be harmful to the body if it recognizes them.

But if the immune system defenses hit top gear, there is a risk that the slightest breeze will start immunizing, or even the enemy will strike together, which is equally threatening to one's health.

Allergies, which are more common in our lives, are examples of a nervous, oversensitive immune system that reacts to the slightest thing.

Some common allergens in life, pollen ah, milk ah, peanuts ah, itself is not harmful to the human body, but for some people, the immune system will recognize these ordinary substances as dangerous molecules, over-defense, produce an immune response, light may get a rash, vomiting and diarrhea, serious dizziness and shock or even death is also there.

Allergies are to external substances, if the immune system for the human body's internal cell tissue recognition is also a problem, indiscriminately attack, then not only can not play a protective role in the human body, but will bring harm.

In this case, it is an immune disorder.

For example, lupus erythematosus, rheumatoid arthritis, and so on, basically the immune system attacks normal cells and tissues.

Strictly speaking, an immune disease is a malfunction of the immune system, but if the "immune system is in full swing", as the title suggests, then this kind of indistinguishability between friend and foe is bound to occur as well.

A balanced immune system is what protects the body's health the most~

If the body activates all the immune systems, then the person will soon leave this world.

The body's immune system is designed to monitor, defend and regulate the body against invading pathogens or other harmful substances. If you've seen the cartoon "Working Cells", you know that the white blood cells are the ones that destroy the invaders.

However, if the body's immune system is fully activated, the equivalent of raising the level of vigilance, then on the one hand, the foreign invasion of the body search more powerful, and will even grass, mistakenly hurt their own cells. Typical is the allergic reaction, allergy is the human body for allergens excessive stress reaction, so that the various symptoms of allergy. Therefore, allergy is not considered a disease, it is just an overreaction of the body's immune system, with aallergy historys friends understand that whether it's pollen, crayfish, there's always the odd allergen waiting for you.

Another typical example is that these genes for immunity in our bodies may have come from the Neanderthals, these primitive rude savages, deep down in a harsher environment, had genes in their bodies that could deal with viruses, bacteria, and other pathogens, and had a more developed immune system, but in today's society, where hygiene has been greatly improved, these over-immunizations can cause allergies, inflammation, and other kinds of modern-day Trouble.

It's scary to lose your immune system, it's also dangerous when all immune systems are activated, a sip of water, a breath can be fatal.

Activation is just a name. Body system sensitivity are distinguished: high, medium, low, blunt, several grades, the current instrument is unable to measure. Such as fingers to the razor blade cut, healing high 36 hours can not see the wound, healing in 3 days can not see the wound, healing low 7 days or so, blunt will be inflammation class. So high immunity in vivo have a little problem, the symptoms will be presented to the blunt class is not detected viscera have problems occur, the symptoms will not be presented. This type of human disease is a big disease, human body temperature is 37 degrees, the degree of warmth in the hands and feet with or without probably perceive the health of people with or without thousands of years of inheritance down the blood and gas enough, warm enough. Because cold hands and feet cold not only hands and feet, but the five viscera and six viscera blood circulation smooth or not. Organs and organs of the microcirculation of blood vessels are congested, the body that comes to the healthy energy. Clinical is the most distinguishable, please correctly distinguish between the state of health for the foundation of life, can only grasp the life in their own hands, only to say that since birth to go one hundred years during the real for their own life. The universe and mankind as a whole, if you rely solely on a certain examination data prevail, please reflect on their own.

First of all, it should be clear that the immune system includes not only the cells responsible for removing foreign substances and killing and engulfing bacteria and other foreign objects, but also the white blood cells that terminate the immune response - regulatory (suppressor) T cells. However, I understand that by "activating all the immune system", the questioner should be asking what can happen to a person if the immune system is oversensitive and powerful.

The policeman in the center is a regulatory (suppressor) T-cell.

The first one is the allergic reaction that is talked about in many answers, which is an inappropriate reaction of the immune system to a harmless substance that enters the body. Generally, allergies can cause tearing, itching, rashes, etc. Some severe allergies are called hypersensitivity reactions, which can lead to generalized itching, laryngeal edema, difficulty breathing, loss of consciousness, and are likely to be life-threatening if not treated with first aid.

Another type of situation is when the immune system treats its own tissues as foreign antibodies and attacks them, called an autoimmune response. There are times when the immune system attacks unseen autologous material, and there are also times when the immune system gets so high that it finishes attacking foreign bacteria and goes on to attack its own organs; for example, the immune system may turn to attack the heart after attacking strep in the throat, resulting in rheumatic fever. Autoimmune diseases include autoimmune hemolysis, autoimmune progesterone dermatitis, Grave's disease (a thyroid disorder), myasthenia gravis, aspergillosis, rheumatoid arthritis, vasculitis, and many more, in addition to the SLE mentioned in other answers. These diseases are mildly uncomfortable, but can be life-threatening. Immune system disorders are also one of the more troublesome to treat, and sometimes they can inexplicably develop and inexplicably get better. Therefore, the immune system or peace of mind is good.