What causes intramuscular shots to hurt? Is it the volume being administered?

712 views

[ad_1]

What causes intramuscular shots to hurt? Is it the volume being administered?

In: Biology
[ad_2]

Multiple possible reasons.

If the muscles weren’t relaxed enough during injection, then there will be resistance while inserting the needle which can damage the tissue.

Needle tips are sometimes sterilised with alcohol, which dehydrates local tissue when injected and cause discomfort.

Poor technique injects the short subcutaneously rather than intramuscularly, which doesn’t drain as well as muscle tissue so swelling can occur.

In the case of something like a tetanus shot the presence of the inactive virus is enough to provoke an immune response. Since tetanus paralyzes muscles the vaccine causes pain in the muscles of the arm after injection.

**Please read this entire message**

Your submission has been removed for the following reason(s):

* ELI5 requires that you *search the ELI5 subreddit for your topic before posting*.

There are no exceptions to this rule.

Users will often either find a thread that meets their needs or find that their question might qualify for an exception to rule 7.

Please see this [wiki entry](http://www.reddit.com/r/explainlikeimfive/wiki/how_to_search) for more details (Rule 7).


If you would like this removal reviewed, please read the [detailed rules](https://www.reddit.com/r/explainlikeimfive/wiki/detailed_rules) first. If you still feel the removal should be reviewed, please [message the moderators.](http://www.reddit.com/message/compose?to=%2Fr%2Fexplainlikeimfive&subject=Can%20you%20review%20my%20thread?)