Hi

I'm a bit interested to begin boxing. This far I have only looked the internet for basics and some push ups and sit ups.
But there is a problem.

I have tried to jab at home and I think that the form at least isn't terrible.
But sometimes when I throw the jab there is a sound from the elbow and it hurts, sometimes quite alot, and I don't know why. The pain disappear quite fast though.

Once I made three such jabs (never done more at a time) before deciding this pain can't be a good thing. That evening I also felt a bit of pain in the elbow when I were doing some push ups. I actually felt a bit when I pressed my finger against a certain spot on the elbow for a week or two after that time (not by chance, pressed once in a while trying to find out what was wrong).

So my question is, is there something wrong with the form of the jab or is it my elbow?

Thanks for reading.