Fans of Justin Bieber voiced worries this week about the singer’s health after he was seen with distant, hollow eyes and a somber, worn-out appearance.

Thousands of ‘Beliebers’ gathered to speculate about whether his physical decline was due to the difficulties of being a new father or if there were reports of a tense marriage.

In order to determine what might be causing his appearance and whether a more serious health issue is at work, DailyMail.com has now consulted a number of medical professionals.

The most obvious changes in Bieber’s appearance, according to board-certified plastic surgeon Dr. Gaurav Bharti, were his receding hairline, loss of facial volume, and the appearance of wrinkles and dark circles. He made these comments to DailyMail.com.

“Prolonged poor sleep and inadequate recovery can also accelerate signs of aging, making someone appear more tired or drawn,” he said.

Jonathan Alpert, a psychologist in Manhattan, told DailyMail.com that Justin has been the subject of “immense scrutiny” for a long time, which may be made worse by the demands of fatherhood. The specialists emphasized that they hadn’t looked at or handled Bieber.