[Serious] The Purpose of Pain

[arewethereyet]

And yet the pain relief medicine has not been invented until a few decades ago. So in many ways, even the poor people have better lives today than let's say medieval kings who had no way to relieve pain and were bored with mundane everyday stuff.

There were pain relief remedies centuries ago.  

For instance:
Willow bark
Where and when: Mesopotamia, 4000BC; China and Europe, 400BC.
What it is: Originally, willow bark was chewed to fight fever and inflammation. Willow bark is now commercially available as capsules, powder, or raw bark and is said to treat headaches, inflammation, pain from osteoarthritis, and lower back pain.
Does it work? The active ingredient in aspirin, known as acetylsalicylic acid, was formulated from the salicin found in willow bark. Salicin works in combination with other chemicals, flavonoids and polyphenols, found in the bark. Some studies suggest that this blend could be as effective as aspirin for pain relief and inflammation, and at a much lower dose.

Pain relief through the ages: what are they and did they work? - BBC Science Focus Magazine

A simple Internet search will show you that there have been pain remedies much further back than medieval times.  Look up opium.