What do they exactly mean when they say, "it's all pain anyway?" I don't understand at all.
If we do not investigate exactly what type of pain the patient is experiencing, how can it be addressed? If we don't know what's causing it, how can we treat it?
Nociceptive pain feels very different from neuropathic pain and the causes are different. How they're treated is different.
Somatic pain feels very different from visceral pain and treatment will vary. One can be benign and another can be a symptom of something serious.
Acute pain is very different from chronic pain and treatment will be different.
Just think about the abundance of pain meds. Common agents used in pain control: NSAIDS, steroids, opiates, tricyclic antidepressants, SSRIs or SNRIs, antiepileptics... All these are used for pain. How will you choose if you do not know what works for what type of pain?
Does your nursing textbook
have a chapter on pain? I'm sure it will discuss all those different types and why knowing them are important.