Why did you get an injection in your ass when you were a child and hit your arm when you grew up? Netizen: I'm still scared.

Speaking of the psychological shadow of childhood, getting sick and getting injections is definitely the top few, especially spanking needles. One second you're smiling, the next you're crying for the land ... it's really painful!

Even though it has become a rite of passage, many people feel particularly scared at the thought of an injection. They would rather take medicine or intravenous drip than have an injection, and some even suffer from "injection phobia".

I believe many people are afraid of injections, especially butt injections, but when they grow up, they seem to have less experience of spanking needles. Why on earth did you give an injection in your ass?

The first thing to know is that hip injection belongs to intramuscular administration. Compared with oral administration, drugs can act quickly after entering the human body. The reason why the buttocks are chosen is because the muscle tissue of the buttocks is the most loose, which is conducive to drug absorption. [1] Moreover, the hip muscle area is large and the blood vessels are less distributed, which can avoid accidental injury to bones and blood vessels.

In addition, children often use hip injections because their arm muscles have not yet developed, and children like to entangle in injections, which is difficult to control in their hands, so hip injections are safer.

The spanking needle is particularly painful because the area of tissue damage is relatively large.

Ordinary flesh injection only needs to penetrate 0.5 mm under the skin, while spanking needle needs to penetrate 2.5~3 cm under the skin and enter the muscle, which means that the wound area of butt needle is larger. Although it is an inconspicuous dot to the naked eye, you can see dozens of times the difference under the microscope.

In addition, unlike intravenous injection, when a doctor spanks a patient, the needle is vertically inserted into the meat, and some doctors even have the same operation as throwing darts. In order to ensure the success of drug administration, the doctor will slowly push the syringe, so that the pain will last longer and naturally feel more painful.

1. Needle size

Usually, if you pay attention to the observation, you will find that the end of the needle has different colors, which is actually for medical staff to distinguish the thickness of the needle. The thicker the needle, the bigger the wound and the more severe the pain. Especially in intramuscular injection, the muscle cells of human body are arranged closely, which requires a needle with a certain thickness to puncture. When the muscle fiber is punctured by the needle, it will produce strong pain.

2. Irritability of the drug itself

Some drugs can irritate vascular mucosa or muscle tissue, causing severe pain. Some drugs with high osmotic pressure, vasoconstrictors and some chemotherapy drugs can cause more severe pain, such as paclitaxel and penicillin.

Some people see such a thick needle when they have an injection, and they are afraid that if the needle is pulled out, they will leave their own meat inside. In fact, this kind of thing is completely unnecessary.

Ordinary intramuscular injection or intravenous injection needle will not happen, because the subcutaneous and intramuscular injection parts are solid, and the pressure difference is not as great as that of blood injection, so the meat will not enter the needle.

But there is really a kind of needle that can keep the meat in the needle, and that is a biopsy needle specially used to grasp the tissue. It's so thick:

Biopsy needles are commonly used to sample organs and tumor tissue cells, and are subdivided into bone puncture needles, aspiration needles and other categories. [2] The needle head of this kind of needle is very thick, and there is negative pressure in the needle head. After penetrating into the tissue, a certain pressure is manually applied to increase the pressure difference between the needle and the tissue, thereby cutting off the tissue. After the tissue is cut, it will be taken out of the body with a needle and then tested.

Since childhood, no one can never get sick. He is ill, so it is natural that he should take medicine and have an injection. Especially when I was a child, I caught a cold and had a fever, and I couldn't get rid of my butt needle, which hurt to tears. Although it is for treating diseases, we are always a little afraid of injections, even when we grow up. In fact, there is some truth behind the pain of injection. After reading it, will the next injection be less painful?

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