PAIN - Left thumb hurts... pain in hand
6:59
How To STOP Wrist Pain on Guitar - MUST SEE
5:49
How To Fix Guitar Wrist Pain (INSTANTLY!)
9:19
Thumb / Wrist Pain In Barre Chords? Do THIS!
4:40
Bass Musician Magazine - Thumb Pressure and Thumb Pain Examined
8:54
THUMB PAIN?! DO THIS!
11:27
Why Playing Guitar Feels Hard
20:31
a 20 min video about the left thumb
7:48