> For the complete documentation index, see [llms.txt](https://hopemoore.gitbook.io/unity-basics/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hopemoore.gitbook.io/unity-basics/physics/colliders-and-triggers/colliders-and-triggers-1.md).

# Common Issues: Colliders and Triggers

Common collider issues

**Issue:**

OnTriggerEnter(), OnTriggerStay(), and/or OnTriggerExit() are not working.

**Solutions:**

1. Make sure the objects have colliders and the proper one has the checkbox for **Trigger** checked in the Inspector Tab.  This can be checked and updated with the script by using .isTrigger with the object's collider component.
2. Try adding a Rigidbody component to objects that need them.

**Issue:**

OnColliderEnter(), OnColliderStay(), and/or OnColliderExit() are not working.

**Solutions:**

1. Make sure the objects have colliders and the **Trigger** property is unchecked in the Inspector Tab.  This can be checked and updated with the script by using .isTrigger with the object's collider component.
2. Try adding a Rigidbody component to objects that need them.

{% hint style="info" %}
You can check for and update these components and their properties within the script. Go here for information about [accessing components](/unity-basics/select/components/accessing-attributes.md) through the script.
{% endhint %}