I've been having really bad headaches lately. Why is this happening?

I am worried because I have been experiencing persistently severe headaches lately. I don't have any specific aches or pains, but I frequently feel a throbbing or heavy sensation in my head. I feel even more frustrated because I don't know the exact cause, whether it is due to insufficient sleep or stress.

My headaches seem to get worse, especially on days when I look at my smartphone for a long time or study. Although I am usually fine, sometimes the pain strikes suddenly, causing discomfort in my daily life.

I am wondering why I get these headaches and how I can manage them to get better. If anyone has experienced similar symptoms, I would appreciate your advice. I am also concerned about whether I need to see a doctor.