i'm sure there's an old thread addressing this, but wasn't able to find it. I am completely new and dabbling in my first chastity device, a HT3. I swear I have never played with my balls as much as I have trying to get them secured. Are there any circulation concerns using these types of devices? I notice they gain a little color, but it' snot painful. I just don't want to wake up in the morning castrated (ouch!).
Are there concerns? Yes. If you're wearing a ring that is much too small, you can cut off circulation. That, however, is almost certainly going to be immediately or very quickly obvious. If you're worried, wear your cage for a few hours during the day with the key on hand if needed. If you're not in excruciating pain (not from chafing), you're probably good to go.
Balls temperature can also be a good indication. If your balls don't get enough blood you feel lower belly pain as if kicked in the balls or punch in the belly. Aslo good rule of thumb is that you should be able to fit the tip of a finger under tge ring. If you can do it easily abd past the first knuckle it is too wide. If you can't or fight a lot to squeeze it in, probably to small.
Try to go for some shorter term lock ups. Like 2-4-8-16-24 hours with after the lockup checking your skin. This should help to see if there is anything wrong. Also what @Sub40s and @Unlucky have said.