How is just writing "PAIN" an invalid title?

There. Have some more words if you're going to be pedantic. It's under my ribcage on my left side. It's not terrible but it's enough to be very annoying. It hurts to breath in. I don't know what caused it. It came on in the last hour and all I did was sit here. Normally pain means I had too much fun but I've definitely been short changed this time. I'm missing the fun part and just have the pain part! Does this mean I'm getting old? My son says yes. Old and grumpy. 😣