I hope this might help :)
Homework causes stress to students because it puts pressure on the student to complete the assignment with a time constriction with no assistance from the teacher. When teachers give their students homework, the student has to solely rely on their notes or any study materials available. Some students may miss parts in class and not the the adequate amount of materials to complete such an assignment alone without the help the teacher. These type of situations can create a dilemma for the student and can cause them to panic on whether or not they can complete it on time. Therefore, creates stress for the student.