catecholamines are largely adrenal hormones, so they cause a fight or flight response. That would include anxiety fear and panic, increasing attention and awareness of danger, and aggressive behavior. Some adrenal disorders that release too many catecholamines can cause hair loss and breathing problems. In short, all of these are potential effects of catecholamines, but hair loss and breathing problems are weaker and less often, and only develop with disorders (or tumors in certain locations.
