When Bob Saget was found dead in his hotel room in Orlando last month, many people couldn’t help but speculate about what happened. After an autopsy was done, it was revealed that he died of head trauma.

“The authorities have determined that Bob passed from accidental head trauma. They have concluded that he accidentally hit the back of his head on something, thought nothing of it and went to sleep,” a statement said. “No drugs or alcohol were involved.”

The conclusion has led to many people wondering if this was something that could’ve been prevented. To shed some light on the issue, NBC’s senior medical correspondent Dr. John Torres joined TODAY to discuss Saget’s cause of death.

In the segment, Dr. Torres describes the range of differences you might see in symptoms from a simple bump on the head to something more serious. He also talks of the hallmark signs to look out for including headaches, vision disturbance, dizziness, nausea and confusion. “There can be subtle signs that build up over time,” he says.

In Saget’s case, Dr. Torres explains that he had an epidural hematoma, which is a high-pressure bleeding inside the brain. He hit the back of head, and likely had a few of those symptoms. The thing that typically happens afterwards is what Dr. Torres calls a “lucid period,” where the person may feel normal and like nothing ever happened. Then it goes back to feeling headaches, vision issues and other symptoms.

A major sign to look out for is if the symptoms keep increasing in intensity and don’t go away. On top of that, you might experience nausea and vomiting, and dilated pupils. At this point, it’s important to go get CAT scan to make sure you’re not bleeding on the inside. These signs can build up over time and get to a point where you can’t do anything about it—so it’s important to get checked early if you’re experiencing any of these.

Typically, you do have to hit your head pretty hard to have this kind of outcome. So you likely don’t need to worry too much if you bump your head on the kitchen cabinet or something similar. Head trauma like this usually comes as a result of a car accident or assaults to the head.

To learn more about what to look out for after head trauma, check out the video below.

Do you know anyone who has experienced head trauma before?