Skip to main content

Warning notification:Warning

Unfortunately, you are using an outdated browser. Please, upgrade your browser to improve your experience with HSE. The list of supported browsers:

  1. Chrome
  2. Edge
  3. FireFox
  4. Opera
  5. Safari

Obesity is a condition where your weight affects your health. It is a long-term (chronic) condition with many causes. It usually develops over time.

Talk to your doctor if your weight has a negative impact on your life.

There is separate advice if you are concerned about your child’s weight.

How to find out if you have obesity

Your doctor may ask if they can check:

They may diagnose you with obesity if you have excess body fat and any health problems linked to obesity.

Diagnosing obesity

Causes of obesity

There is no single cause of obesity. But there are some risk factors.

Some of these may be outside your control. You can develop obesity even if you eat well and are active.

Causes of obesity

Treating obesity

Things you can do to manage obesity include:

Managing obesity can improve your quality of life. It will also reduce your risk of weight-related health problems. It's not just about losing weight.

Your healthcare team may also offer you other treatments for obesity.

These can include:

Your doctor can work with you to find the best treatments that suit you and your life.

Help and support for obesity


Content supplied by the NHS and adapted for Ireland by the HSE

Page last reviewed: 20 October 2025
Next review due: 20 October 2028