Why do mosquito bites feel itchy? Ask a professional to answer from a biological point of view

This is because the body's immune system releases a protein called histamine to fight foreign substances, and this immune response triggers an allergic reaction at the bite site. Histamine causes swelling of the tissues around the bite when blood flows to the bite site to speed up tissue recovery, and the intensity of this allergic reaction varies from person to person, with some people having a more severe allergic reaction to a mosquito bite.

Only female mosquitoes bite mammals because they have to suck blood every three or four days to get the protein they need to make eggs; Male mosquitoes mainly feed on nectar, while female mosquitoes use animal body heat and physiological changes to search for targets, which may be why human ankles and feet are more commonly bitten by mosquitoes, because the blood vessels in these parts are closer to the body surface, so more body heat is released.

In terms of mosquito species, there are more than 200 species of mosquitoes in the United States and more than 2,500 species worldwide. In fact, mosquitoes can be found everywhere except Antarctica, and they can also transmit diseases such as malaria, yellow fever, encephalitis, and West Nile virus, and more than 700 million people are infected by mosquitoes every year.

Another way to put it:

Because before the mosquito sucks blood, in order not to be noticed, it will first inject a venom into the person's **, which will paralyze the person's nerves so that the mosquito will not be detected in the process of sucking blood. But then it gets bagged and itchy.

The venom of mosquitoes is acidic, so wash it with something alkaline and it doesn't feel too itchy. For example, soapy water.

There is also a saying that there is an acid-base balance in human blood, and human blood is weakly alkaline, and mosquitoes must first inject a certain amount of formic acid into the subcutaneous blood vessels when they bite people to suck blood. This kind of substance that prevents blood clotting, which contains protein, it is a foreign body to the human body, destroys the acid-base balance of the human body's blood, thereby changing the viscosity of the blood here, the microcirculation of the blood is destroyed, causing a small range of blood coagulation, causing people's own immune response, some people react strongly, it will be red and swollen into a small packet, and will feel itchy; If someone reacts weakly, it is not obvious. After a few days, when the body's blood reaches acid-base balance again, the symptoms will disappear.

1. When mosquitoes suck blood, they will leave their saliva, which is an anticoagulant, and the formic acid contained in it is an important ingredient that makes people itch and unbearable.

2. However, it is interesting that after research, if it is the first time to be bitten by a mosquito, people will not feel scattered to the point of itching, because the immune system cannot recognize this substance, but after being bitten again, it will have a bright and itchy feeling.

3. Because the immune system secretes a component of histamine. What's even more surprising is that when you are bitten many times within a certain period of time, you will not feel the itch, because the immune system has fully adapted to this substance, and will put formic acid into the macrophage population for decomposition, and naturally histamine will not be secreted by the bond, so you will not feel itchy, and the bite will not be packed.