Knee has been twitching for 2 days, want an explanation.

LOUD, thumb twitching, have lump in upper arm thats painful to

Thumb twitching

Right middle finger twitching nonstop for days? Could it be muscle

left thumb twitching, while finger is bend. happens like once

Thumb twitching and constant shooting pain

Thumb muscle twitching even intervals

Thumb twitching after flexing

Persistent thumb twitching

Thumb keeps twitching

Lump at base of thumb

is this arthritis or a tumor in my thumb 'knuckle area'? Doesn't