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Embolism. Which could happen with regular water or even just air being injected into a vein.
Infection. It's not saline; there's more than just saltwater in the sea and all those microbes are gonna wreck havok on your body having bypassed most of the things that normally keep them out of your body.
No. The first part is completely wrong.
Embolism describes a blockade of a vessel from blood flow. That's not what will happen with seawater nor normal water.
Seawater is hyperosmolar and therefore would draw water into the vessels from the intracellular region and cause hypertonia (high blood pressure), but it takes a fuckton of it to make the blood so hyperosmolar that the erythrocytes are disfigured. (To give you a comparison: Sea water has around 3% saline content. We used to give hyperosmolar solutions that had 7.2% and starch in it - so with a much stronger effect). In the end the kidneys would very likely fail and kill the person in combination with the hypertension.
Normal water has the opposite effect - it's hypoosmolar and therefore goes the other way. (And causes edema but not embolism)
Air is a totally different story and air embolisms are a real threat - but even air needs much more than one would think. (A few ml won't hurt an average.)
Infection? Fuck yes.
Not sure if this is your subject matter expertise or not but what if you sterilized the seawater, so we don’t need to worry about infection, purged the air from the line, so no embolism, and only injected 300mL which is a comparable amount to saline you might receive in a hospital.
Seawater is 3.5% salt vs saline which is 0.9% would that much salt just be diluted by the body or could it cause local damage?
I just watch a lot of chubbyemu vids and may be a slight bit of a hypochondriac.
I can't imagine the salt being good for you. It could kill internal flora, it might cause pain, and it definitely is going to not be fun for your kidneys.
Bottom line: You should not inject anything into yourself, except as prescribed by a doctor. I wouldn't even inject recreational drugs, personally. And I have no qualms about doing drugs.