The Mean Girls star was rushed to LA's Mount Sinai medical centre due to a lung infection on Sunday (September 23). She later apparently told friends she has had "walking pneumonia" for weeks.
Lohan was eventually discharged after treatment and has assured Page Six that she is on the mend.
"I got sick again, but I am all right," Lohan told the newspaper.
The star also reportedly told friends privately that high stress of her personal life was the cause of her recent illness, according to TMZ.
Lohan was arrested last week in New York City for an alleged hit-and-run crash outside a hotel.
She has since insisted that she was not at fault in the apparent collision and apparently might even sue the accuser.
Watch Lindsay Lohan's 'Confessions of a Broken Heart' music video below: