"Constant irritation" refers to a feeling of annoyance or frustration that persists for a long time and does not go away easily or quickly. Full definition
Improper digestion leads to poor absorption of nutrients and constant irritation of the gut. (believemidwiferyservices.com)
Millions of people suffer from the constant sensation of ringing or buzzing in the ears known as tinnitus, creating constant irritation for some and severe anxiety for others. (sciencedaily.com)
Gomo's weird take on movement that I mentioned earlier also proved to be a source of constant irritation for me, because, you seem, it makes everything just a bit more awkward than it actually needed to be. (wolfsgamingblog.com)