why do puffers puff?

[pacheco]

I have two puffers and have noticed them puffing up lately. nothing new has happened . maybe they have been doing this all along and I just now noticed them.

[Fluff]

Normally puffing is a result of being stressed. Its used as a defensive posture. You say puffers but I only see one listed in your signature. Has your stock list changed? Is there anyone in the tank picking on the puffers? What type of puffers do you have?

[h8z2luze]

Usually you dont house puffers together. They might be aggressive towards each other. That could be the reason of the puffing.