How painful is a spinal tap?

The boundary of a field or a system is called a threshold, and its value is called a threshold.

The pain threshold is the lowest value of the stress tissue response caused by pain stimuli, which means the critical value. That is, in a stimulus-based system or the like, although it does not respond to small stimuli, it reacts violently when it exceeds a certain limit.

Pain threshold is the body's maximum ability to withstand external stimuli. The higher the pain threshold, the stronger the ability to withstand pain, and vice versa. Pain threshold elevation is the body's normal regulatory mechanism, and it is a reasonable and beneficial adjustment. However, the increase of the pain threshold does not mean that the manual stimulation should be enhanced accordingly. If the stimulation volume exceeds the normal range, but the pain threshold has not been reached, it is very likely that the injury will occur without feeling pain. Everyone is biologically different. Some people feel a lot of pain when getting an injection, and some people don't, because everyone's pain threshold is different.

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