LSD can cause an individual to experience anxiety, depression, flashbacks, and elevated blood pressure. The unpredictable nature of LSD can also cause some users to experience terrifying thoughts, feelings of despair, fear of losing control, fear of insanity, and fear of death during a bad trip. Prolonged consumption can lead to psychosis, seizures, hyperthermia, and suicidal thoughts.

https://recoverypartnernetwork.com/drug/illicit/lsd-addiction-abuse-and-treatment