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Yes. It could definitely be the problem.
Hissing and hiding can also indicate that he is in pain so, if it persists, you need to see the vet to rule out a bigger problem.
Let me know if you still have questions.
Since he had a previous blockage, you might want to see the vet again to rule out a medical cause for the aggression.
And you are more than welcome! Come and see us again with all your questions.