Is it okay to feel a tight sensation in my chest once in a while?

These are symptoms that occasionally occur these days. I feel a tightness in the middle of my chest. It feels like something heavy is pressing down on my chest. After a while, it gradually eases up. What could this be? Some say it might be related to the heart, while others suggest it could be blood vessels. If these symptoms persist, I would go to the hospital, but since they don't happen all the time and tend to go away on their own, I think I can just live with it. Are there others like this? Should I see a doctor?