HB 161 amends the Texas Education Code to provide excused absences for students experiencing symptoms from certain menstrual disorders. Specifically, the bill mandates that school districts excuse up to 10 days of absences per school year for students suffering from menstrual disorders such as dysmenorrhea, endometriosis, menorrhagia, or polycystic ovary syndrome, provided that documentation from a licensed physician is submitted. This bill also ensures that these absences do not negatively affect the student's average daily attendance calculation and allows a reasonable time for students to make up missed work.