Section 3 Mental Health Act: A Full Guide for Patients and Families

Section 3 of the Mental Health Act 1983 is one of the most significant legal provisions in UK mental health law. Understanding what it means,  and what rights come with it,  can make a difficult situation feel more navigable. This article explains what Section 3 is, when it is used, how long it lasts, and what happens during and after detention.

What Is Section 3 of the Mental Health Act?

Section 3 is known as admission for treatment. It is used when a person needs to be admitted to hospital and treated for a mental disorder, and it is not possible or appropriate for this to happen on a voluntary basis. Unlike Section 2, which is primarily for assessment, Section 3 is used when the nature of a person’s mental disorder is already established and treatment is the primary need.

When Is Section 3 Used?

Section 3 can be applied when the following criteria are all met:

• The person is suffering from a mental disorder of a nature or degree that makes it appropriate for them to receive medical treatment in hospital
• It is necessary for the health or safety of the person, or for the protection of other persons, that they receive such treatment
• Appropriate medical treatment is available for them
• The treatment cannot be provided unless the person is detained under this section

How Does Section 3 Differ From Section 2?

The principal differences are:

• Purpose: Section 2 is for assessment (up to 28 days); Section 3 is for treatment (up to six months initially)
• Duration: Section 3 lasts up to six months and can be renewed, whereas Section 2 cannot
• Criteria: Section 3 requires that the person’s disorder is known and appropriate treatment is available; Section 2 is for when assessment is still needed
• Nearest Relative: The Nearest Relative has the right to object to a Section 3 application, which they do not have in relation to Section 2

Who Authorises a Section 3 Detention?

Section 3 requires:

• Two written medical recommendations,  one from a doctor approved under Section 12 of the Act (usually a psychiatrist) and one from another doctor who, where possible, has prior knowledge of the person (often the GP)
• An application,  made by an Approved Mental Health Professional (AMHP) or, in some cases, the Nearest Relative

How Long Does Section 3 Last?

Section 3 initially lasts for up to six months. After this it can be renewed:

• For a further six months at the first renewal
• Then for periods of one year at a time thereafter

However, the person must be discharged as soon as the criteria for detention are no longer met. They do not have to remain for the full period.

What Rights Does a Person Have Under Section 3?

Detention under Section 3 does not remove a person’s fundamental rights. These include:

• The right to know the reasons for detention
• The right to appeal to the Mental Health Tribunal,  this can be done at any time during a Section 3 detention
• The right to have their case reviewed by the Hospital Managers
• The right to support from an Independent Mental Health Advocate (IMHA)
• The right to have their Nearest Relative informed
• The right to consent or refuse treatment in most circumstances (with exceptions under Part IV of the Act)

Treatment Without Consent Under Section 3

Section 3 does allow for certain treatments to be given without consent in specific circumstances. This is governed by Part IV of the Mental Health Act and includes provisions for independent clinical review. Medication may be given without consent for up to three months; after that, a second opinion from an approved clinician is required.

What Happens After Section 3?

When Section 3 ends,  either through discharge, expiry, or a successful Tribunal,  the person is no longer legally detained. They may:

• Be discharged into community care
• Continue receiving treatment voluntarily
• Be placed on a Community Treatment Order (CTO) in some cases, which allows treatment to continue outside hospital with conditions attached

Supporting Recovery After Sectioning

The experience of psychiatric detention and the mental health crisis that preceded it can leave significant emotional and physiological marks. Supporting the nervous system during and after recovery is an important part of the process.

The nervous system reset bundle from Herba Naturalle offers a gentle three-month herbal protocol designed to calm the surface nervous system,  reducing inner agitation, restlessness, and stress reactivity. It is particularly relevant for those recovering from periods of acute mental distress.

You can also explore real case scenarios from clinical practice, and visit the 

Support Your Body Naturally With Herba Naturalle

If any of the topics in this article resonate with you, the Herba Naturalle Bundle page offers a structured, three-step herbal protocol designed to address chronic illness at the root. The approach, developed over 30 years of clinical practice by Anjela Jeganathan, works across three healing layers:

• Step 1,  Digestive Reset: Restore digestive rhythm, nutrient absorption, and healthy elimination
• Step 2,  Surface Nervous System Reset: Calm inner restlessness, reduce stress reactivity, and settle the mind
• Step 3,  Smooth Muscle & Immune Lining Healing: Reduce chronic inflammation in the tissue lining surrounding organs, blood vessels, and immune pathways

Explore the full protocol at the Herba Naturalle Bundle page and find the starting point that matches your body’s needs.

Have Questions? Get in Touch

If you would like personalised guidance or have questions about herbal support for your health, you are welcome to contact Anjela directly. She offers consultations tailored to your individual health needs.