Cannabis Causes Red Eyes

Why Cannabis Causes Red Eyes?

The use of cannabis is known to have several effects, both negative and positive.

One of the common side effects that many individuals experience after using cannabis is the occurrence of red eyes.

Whether you are a medicinal user or new to cannabis, it’s important to know the reasons behind red eyes and also understand how to manage it.

In this article, we will discuss the several causes of red eyes when consuming cannabis and suggest some strategies to minimize this uncomfortable symptom.

Understanding Red Eyes

When you consume cannabis, whether through smoking, vaping, or ingestion, the components in the plant interact with your body in numerous ways.

One such component is THC (tetrahydrocannabinol). This is responsible for most of the effects of cannabis.

As THC enters your bloodstream, it prompts blood vessels throughout your body (including those in your eyes) to widen.

This dilation leads to increased blood flow to the eyes, which eventually results in redness.

Apart from THC, there may be other factors that contribute to red eyes after using cannabis.

Some researchers believe that certain cannabinoids or terpenes present in cannabis may also have properties that widen blood vessels and contribute to eye redness.

Managing Red Eyes

While red eyes may not cause any harm, on their own, they can be inconvenient or even embarrassing for some people.

Fortunately, there are ways to manage this symptom:

1. Use Eye Drops

Opt for over-the-counter eye drops, specifically designed to reduce redness in the eyes.

These drops work by narrowing the blood vessels in your eyes and reducing their appearance.

For the best results, make sure to choose eye drops that are specifically formulated for reducing redness than general-purpose ones.

2. Stay Hydrated

Drink plenty of water as it can help counteract the dehydrating effects often associated with cannabis use.

When you’re well hydrated, your body is better equipped to regulate blood flow, which may help minimize eye redness.

3. Try Cold Compresses

Applying a cold compress or an ice pack to your eyes can help constrict blood vessels and decrease redness.

Simply wrap a few ice cubes in a cloth.

Gently place them against your closed eyes for a couple of minutes and observe the results.

This method can provide relief, especially if you don’t have access to eye drops.

4. Consider Changing Cannabis Strains

Keep in mind that certain cannabis strains are more likely to cause red eyes compared to others.

If you often find yourself dealing with this side effect, you may want to explore strains that contain lower levels of THC or have different combinations of cannabinoids.

Experimenting with different options can help you discover a strain that’s less likely to result in red eyes while still delivering the desired effects.

5. Avoid Smoking

Although smoking cannabis is a popular method of consumption, it can also be a factor contributing to red eyes.

The process of combustion, during smoking, releases irritants that can cause inflammation and redness in the eyes.

Consider trying methods such as vaping or edibles, as they may be gentler on your eyes.

It’s important to note that these strategies may not work well for everyone since individual responses to cannabis can vary based on different factors such as tolerance, sensitivity, and overall health.


Experiencing red eyes after consuming cannabis is a side effect faced by many individuals.

The dilation of blood vessels in the eyes triggered by THC is primarily responsible for this symptom.

While managing red eyes may not be crucial for everyone, those who find it bothersome can use the tips mentioned above.

Also, it’s crucial to remember that everyone’s experience with cannabis is different. Hence, finding a solution that works best for you is important.

If red eyes persist or are accompanied by other concerning symptoms, make sure to seek advice from a medical professional.