Wearable Activity Tracking to Curb Hospitalizations

This study is being done to collect patient generated health data to predict the risk of patients needing emergency department visits or hospitalization before, during. and after receiving radiation therapy.

Inclusion Criteria: * Age \>= 18. * Eastern Cooperative Oncology Group (ECOG) performance status =\< 2 or Karnofsky Performance Scale (KPS) \>= 50%. * Able to understand study procedures and to comply with them for the entire length of the study. * Ability of individual or legal guardian/representative to understand a written informed consent document, and the willingness to sign it. * Diagnosis of invasive malignancy. * Able to ambulate independently (without the assistance of a cane or walker). * Planned treatment with fractionated external beam radiotherapy over at least 5 days (no fractional requirement). * Not a previous participant on this protocol for subsequent courses. Exclusion Criteria: * Participants bound to a wheelchair. * Participants unable to ambulate independently (needing assistance of cane or walker).