...I did a bit of research ( aka a simple YT search that took all of 5 seconds ).There was Nuthin he kuddo, it's arthritis. It's not like he could do a Google/Youtube search for 30 seconds during his important drinking gin alone for 8 hours time https://www.youtube.com/results?search_query=hand+stretches+for+gamers+&sp=mAEB and then start maybe incorporating hand stretches and exercises recommended by orthopaedic physicians to proactively protect an important thing he needs to be able to do for his Serious Adult Business. It's not an extremely common condition he's overexaggerating due to his fussy-boy attention seeking behavior that he can fix himself with a little bit of exercise, nope, it's cancer-aids-arthrities, Nuthin he kuddo. I'm just being a fucking idiot though, Phil doesn't have time for any of that he's the busiest human on the planet with absolutely zero free-time for any of that voodoo shit, just ask Katherine, she's certainly not some kind of lying cheater or something , you can trust her.
Based on D$P's 'symptoms' his hand is just sore from using muscles he normally doesn't use...or he is developing Tendonitis : ( pain down the back of his hand )
In other news:
D$P revealed that he has Multiple chronic health conditions outside of Post Nasal Drip and Gout. Seeing as he hasn't seen a doctor for anything other than his Gout ( that we know of), Type II Diabetes is out though he most likely has it judging from his diet and lack of exercise. Tin foil hat time folks. What additional self diagnosed Chronic Health conditions does he 'suffer' from?