Psychedelics can be extremely beneficial if you do it under the right circumstances and with the right people. It can heal the mind, body, and soul depending on which type you are using.
On the other hand, if you decide to take a strong psychedelic with people you are not comfortable with or people who decide it will be funny to fuck with you while you are tripping then you have a chance of going into a full-blown bad trip mode. This entails hard breathing, strong and scary vivid hallucinations, feelings of death and negativity, feeling of lostness, and a pounding chest. These are only some of the symptoms of a bad trip and can be different for everyone. Take these with caution and around people you trust in a safe environment with mellow and calming music if you are trying to get the most out of your trip then making sure your surroundings are safe is one of the most important parts of tripping.