Why does a mosquito bite itch? Why do mosquitoes itch when bitten?

Why does a mosquito bite itch? Almost everyone has the unpleasant experience of being bitten by a mosquito, in fact, it should be said that they have been stung by a mosquito. Mosquitoes can't open their mouths, so they won't bite on the **, they actually use six needle-like structures to pierce people's **, and these mouth needles (stylets) form the center of the mouthparts.

These needles suck in blood in the same way that they draw blood; The mosquito also releases saliva containing anticoagulants to prevent blood from clotting, so it can feast peacefully. When the mosquitoes are full of food and drink and float away, all they leave behind is an itchy lump. However, the itchy sensation is not caused by needles in the mouth or chemicals in the saliva.

We feel itchy 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 as they are every other day.

Blood must be sucked once every three or four days to obtain the protein needed to make eggs; Male mosquitoes, on the other hand, mainly feed on nectar. Female mosquitoes use the animal's 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 areas are closer to the body surface and therefore release more body heat. 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 also transmit diseases such as malaria, yellow fever, encephalitis, and West Nile virus, which are transmitted by mosquitoes to more than 700 million people every year.

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The itching sensation caused by mosquito bites stems from the response of the body's immune system. When a mosquito bites, it injects saliva and other substances to help the blood clot, allowing it to better absorb human blood. The body's immune system automatically perceives mosquito saliva as a foreign substance and begins to release a chemical called histamine to fight these foreign substances.

Histamine mainly causes redness, swelling and itching on the surface of sensitive areas by means of neuronal and vasodilation. In addition, histamine and other similar chemicals can also cause a local inflammatory response, causing uncomfortable symptoms such as localized redness, heat, and pain.

In general, mosquito bites trigger an immune response that triggers the production of substances such as histamine, which can cause itching and discomfort. So if you've been bitten by a mosquito once or more, for a cure for itching, try an antihistamine pill or a local anti-inflammatory cream.

I hope I can help you.