Can a guy really throw up after getting hit in the balls?

I feel embarrassed to tell this but I hit my boyfriend in his nuts because he was annoying me yesterday. I don't know I probably punched him harder then he deserved, he eventually started coughing but then I apologized to him however later he said that he almost puked but I just laughed it off cuz I thought it's a joke but it also made me wonder was he serious?

Can a guy really throw up after getting hit in the balls?
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