Eyewitnesses said Lohan, who was driving with her assistant, told people that the truck cut her off and that the accident was not her fault.
The 25-year-old actress appeared bloodied and bruised when she was taken to the hospital yesterday but was released later, reported TMZ Online.
"The actress was admitted in Santa Monica UCLA hospital after her car collided with a 18-wheeler truck but she had no serious injuries and neither did her assistant, who was traveling in the passenger seats and went to hospital separately from the star," her representative added.
The actress today returned to shoot Elizabeth Taylor-Richard Burton TV movie.