Bret Michaels showed encouraging signs on Tuesday by moving his limbs and talking after suffering a major brain hemorrhage late last week -- however the day's news wasn't entirely encouraging.

"Test results indicate a setback in Bret Michaels condition a side effect from the brain hemorrhage called hyponatremia a lack of sodium in the body which leads to seizures," Michaels' representatives announced in a statement on his personal website.

"Due to the severity of his condition, Bret Michaels continues to remain hospitalized in an intensive care unit at an undisclosed hospital. He remains in critical but stable condition according to his doctors."

The 47-year-old The Celebrity Apprentice participant and former Rock of Love star -- who suffers from diabetes -- suffered the hemorrhage last week after complaining of severe headaches late Thursday night.

"Michaels' medical workup demonstrated findings of a subarachnoid hemorrhage, a type of stroke that causes bleeding in the fluid-filled spaces around the base of the brain," read the statement.

"It presents itself suddenly as the sound of a loud gunshot or thunderclap at the back of the head causing severe cranial pain and muscle spasms."

Doctors are still trying to find the cause of bleeding that caused Michaels to suffer the brain hemorrhage and are also trying to determine if an onstage injury last June at the Tony Awards -- when he was struck in the head by a piece of scenery while performing with Poison -- has anything to do with it.

"Many people are speculating Michaels head injury suffered from a prop striking the singer at the Tony awards last June is the cause," reads the statement.

"Additional studies are planned throughout the week to hopefully detect the exact cause of the rupture. Coupled with the fact that Michaels is a lifelong Type 1 diabetic and has recently undergone emergency appendectomy surgery while on tour in San Antonio, he will remain monitored closely by his medical team to make sure no complications occur from the diabetes."

As additional tests are run, Michaels' website stated the reality star is "very lucky as his condition could have been fatal."

"With further testing and rehabilitation, they are hopeful that Bret will gradually improve as the blood surrounding the brain dissolves and is reabsorbed into his system, which can be a very painful recovery and take several weeks to months," reads the statement.

"Michaels remains under 24-hour observation in the ICU and is in positive spirits. He is responding well to tests and treatments. Even though today was a minor setback Doctors remain hopeful for a full recovery and plan to release more specific information next Monday."