Cannabis and Anxiety: What Happens in the Brain?

Topic: Health

Northwestern scientists found a group of brain cells that cause anxiety when people take cannabis. They studied mice to understand this process.

Scientists at Northwestern University have discovered a specific group of neurons, called somatostatin neurons, that contribute to anxiety caused by cannabinoid drugs.

These neurons are located in the central amygdala, an area of the brain involved in processing fear and stress. When mice were given a synthetic cannabinoid drug, they froze more frequently and spent less time exploring a predator scent. This was because the somatostatin neurons became more active.

The researchers used a small microscope to track activity inside the brain while the mice reacted to the predator odor. They found that the cannabinoid drug weakened a natural 'brake' on these neurons, allowing them to become overactive and cause anxiety.

This study could explain why some people experience anxiety after taking cannabis, especially when they are in stressful situations.

Why It Matters

Understanding how cannabis affects brain function is important because anxiety disorders are rising globally. This research may also lead to new ways to reduce anxiety symptoms.

Key Facts

• Scientists at Northwestern University studied mice to understand how cannabinoids affect the brain and cause anxiety.
• The study found that a specific group of neurons, called somatostatin neurons, contribute to anxiety caused by cannabinoid drugs.
• These neurons are located in the central amygdala, an area of the brain involved in processing fear and stress.
• The researchers used a small microscope to track activity inside the brain while the mice reacted to the predator odor.
• This study was published on October 2, 2026, in Nature Communications.

Key Terms

Cannabinoids

Substances that include THC, the main psychoactive ingredient in cannabis.

Somatostatin neurons

A group of brain cells that contribute to anxiety caused by cannabinoid drugs.

Central amygdala

An area of the brain involved in processing fear and stress.

Implications

Understanding how cannabis affects brain function is important because anxiety disorders are rising globally. This research may also lead to new ways to reduce anxiety symptoms.