The whole arm is full of veins and pumping with blood, why can’t they just inject it anywhere or move downwards, down the arm? Why do they HAVE to inject it in the beginning of the bicep/beginning of arm area?
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First: not every injection is given in the same spot. The location of the needle differs based on what is being injected and why. They don’t HAVE to use the upper arm, it’s just a very easy place to do so.
For the majority of people, most jabs in their life are immunizations/vaccinations. Those are generally injected into muscle tissue because that’s the best tissue to do so. You can google ‘why vaccinate into muscle’ to learn more. Your upper arm just happens to be convenient and a nice big juicy muscle to inject into. When sitting in a doctor’s chair or on a bed, the doctor can most easily inject it into that part without you having to do anything. Just relax your arm. An IV drip, on the other hand, usually goes into the lower arm. It needs to stay in there for a longer time (usually several hours or days, and semi-permanent catheders can stay for months for long-term therapies). The lower arm is a straight part that doesn’t bend unless you break the bone, making it ideal for IV placement. It allows for full mobility of the arm too.
I’ve received jabs into my lower arm too nearer to the elbow, when getting multiple jabs in 1 day and both upper arms had already been stabbed.
There are multiple categories of injections, each having their own proper protocols and guidelines for where and how they should be given.
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