They are very common and really there is nothing to worry about. If it is external, it is likely to cause pain or discomfort. That can be treated with otc cremes. If self-treatment isn't effective then he can go see the doc to figure out what else might help.

If it is an internal hem. it probably won't hurt at all. He might notice a bit of bright red blood on the toilet paper if it flares up. It's a very small amount of bleeding that stops quickly. It wont stain his underwear or anything like that.

Go to http://www.mayoclinic.com/health/hem...096/DSECTION=1
for more info.