I only get heartburn in the morning. Why is that?

Lately, I am concerned because my heartburn symptoms strangely only appear in the mornings. I often feel a burning sensation when I wake up or on an empty stomach, and it tends to get a little better after a meal. It is even more confusing because I don't experience much discomfort in the afternoon or evening.

I am wondering if it is because I have been fasting for a long time or if it is due to excessive stomach acid. I am worried that it might be a problem like gastritis or reflux esophagitis.

I would like to know what dietary habits or management practices are helpful for heartburn in the morning, and I am also wondering if it would be a good idea to visit a doctor for a checkup if these symptoms persist. I would appreciate any advice from those who have had similar experiences.