(Question) Pain in the fourth finger (ring finger pain)

I've been feeling a little uncomfortable since yesterday.

Today, it is also somewhat swollen and red.

It also aches and throbs.

It's not that my finger hurts, but there is a slight pain at the tip of my finger.

My grandmother used to do it with her little finger.

When a healthy hand starts to hurt, it's called "saengson arri."

They said it's a disease called "saengson" and to never eat anything fishy.

I forgot to eat fish during lunch and just got back.

What causes primary hand disease? What could it be?