September is National Suicide Prevention Month, so it’s time to check in on your friends and family and look for possible warning signs that someone may be unhappy, or even despondent.

The hashtag #faceofdepression has gone viral recently, prompting people to share their own photos and to prove that depression doesn’t have one face or outward appearance. Depression manifests itself differently in every person, which is why it’s important to talk to your loved ones about their feelings, even if they seem outwardly normal and happy.

If you or someone you know needs to talk to someone, the National Suicide Prevention Lifeline is open 24/7 at 1-800-273-8255. You can also live chat with a counselor on their website, suicidepreventionlifeline.org.

Here are 20 photos that people shared on social media to reinforce the idea that depression doesn’t have one face.