Torticollis is a condition typically observed in infants or children, characterized by the tilting of the head to one side. While there isn't a single definitive cause, the reasons are generally classified into congenital (present at birth) and acquired factors.

Congenital Torticollis: This is often associated with the shortening of one of the sternocleidomastoid (SCM) muscles. Other factors that can contribute to congenital torticollis include the fetal position in the womb, accumulation of blood in the neck muscles, or thickening of muscle tissue.

Acquired Torticollis: Developing after birth, the causes of this type of torticollis can include viral infections, neck injuries, abnormal movements leading to irritation of cervical ligaments, neck muscle spasms, cervical disc herniation, gastroesophageal reflux, or reactions to certain medications. Abnormal sleeping positions can also contribute to acquired torticollis.