It feels like an electric shock at the back of my neck.

Lately, I occasionally feel a tingling sensation in the back of my neck. It doesn't happen constantly; sometimes, it feels like a sudden electric shock that comes and goes just as quickly. It isn't severe pain, but since this sensation occurs, it bothers me and makes me a little worried.

I am wondering if this is due to looking at my smartphone for a long time or having poor posture, or if it is a symptom caused by stiff neck muscles. I would also like to know if stress or fatigue can cause this feeling.

If anyone has experienced similar symptoms, I would appreciate your advice on why this happens and how to manage it. I am also wondering if it would be a good idea to visit a hospital for a check-up if necessary.