Any factors that could hamper or block effective communication

Ineffective communication leads to conflict, which happens when either one of the individuals have misunderstanding or are reaching over the same goal.  (1) not talking things out, (2) not listening to the side of the other, (3) close-minded, (4) not explaining well, (5) not facing your responsibilities whether good or bad.

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.