I suppose I’m a bit uncertain, because I was told by my surgeon ‘no precautions, but listen to your body, and if it hurts, stop’ (the surgery was posterior, so no precautions was a surprise). So I am struggling to differentiate between ‘pain that is telling me to adjust my medication’ and ‘pain that is telling me to back off’!
Jamie provided a really good explanation of the different types of pain. Maybe I can help to put it into perspective in relation to 'precautions', if I share how I approach the difficulty (uncertainty) you describe.
Similar to you, I had a posterior surgery and have no precautions. I was maybe more fortunate, in that they did a pretty good job of walking me through it in hospital. They described the potential stress on the new hip, using the examples that are often the restrictions applied for 6 weeks.
They explained that instead of being given fixed restrictions, I was to approach certain activities and posture carefully and cautiously. I was to avoid
any activity that caused a noticeable difference in comfort level or pain upon performing it. Or an increase in pain or discomfort immediately (30 minutes) following the activity.
They used the example of the 90 degree restriction traditionally fixed for a number of weeks. These can include but are not limited to...
not bending the hip beyond 90 degrees, not crossing your legs or ankles, and not twisting the operated leg or waist.
Personally, this is how I approach 'no precautions'. I understand that bending beyond 90 degrees potentially puts stress on the healing hip and therefore I must be particularly mindful doing any activity that could potentially involve a bend near, on or beyond 90 degrees.
Here's an example, using toilet height. When precautions are in place, we often are advised to use a raised toilet seat for 6 weeks because it prevents us breaking the 90 degree restriction. Personally, despite having no fixed precautions, but being cautious and mindful... I was aware that my hip feels uncomfortable if I use my toilet without a raised seat, it does feel a little more upset immediately after the activity. I therefore use a raised seat. Not because I'm told to by my surgeon but because my hip tells me it isn't comfortable without one. Essentially potentially telling me it is feeling the stress we want to avoid inflicting on our new hips. I know others are perfectly comfortable without a raised seat. We're all different.
My personal measure of 'back off' pain. I know how I feel when standing about to position myself on the toilet. I monitor any twinge or uncomfortableness in the hip region that wasn't detectable before I bent down. I feel a significant difference, I Back off.
My personal measure of take more medication pain is similar. A comparison of what I feel when I take medication compared to what I feel without it. As Jamie explained, pain is experienced and perceived differently by different people for all kinds of reasons too diverse to list. Pain in a general sense is subjective. Personally, I think I may have a high tolerance. Maybe I've experienced chronic pain for a long time and my brain processes it s little differently compared to someone who hasn't experienced chronic pain. Just a thought for illustration, rather than science. My average level of comfort within 4 hours of medication when sitting or laying in a given position can rapidly decline. I experience a relentless uncomfortableness, in any position. I become very fidgety and restless. I personally based on a measure of normal for me am interpreting this restlessness as pain. This is when personally, although I'm reluctant because of side effects, do take a small dose of the medication I've been prescribed for breakthrough pain. In my mind that's exactly what's happened. I've got an average level of comfort when taking my scheduled medication. When my comfort levels go very noticeably above and beyond, I'm calling that breakthrough pain.
I Do hope you may have found some of that useful in terms of clarity. We are all different though. Personally, I always find a real life example helpful. If you haven't keep asking!