A person can be taken to a hospital, held, and treated over their objection — but only through a process with real constitutional boundaries, and those boundaries are frequently misdescribed by everyone involved. This article explains how civil commitment actually works, beginning with the emergency hold that starts almost every case and the strict time limits that constrain it. It covers the substantive standard, which is narrower than most people assume, and the evidentiary standard the Supreme Court has required. It explains why a commitment order is not an authorization to medicate, why those are two separate legal questions decided under different standards, and what rights attach during the hold itself. It covers assisted outpatient treatment, the interaction with criminal competence proceedings, the firearms consequence, and the discharge planning obligations that determine whether the whole exercise accomplishes anything. It closes with what a family member and what a patient should each actually do.