Suicide is the act of intentionally causing one's own death. Suicide is often carried out as a result of despair, the cause of which is frequently attributed to a mental disorder such as depression, bipolar disorder, schizophrenia, borderline personality disorder, alcoholism, or drug abuse, as well as stress factors such as financial difficulties, troubles with interpersonal relationships, and bullying. Suicide prevention efforts include limiting access to method of suicide such as firearms and poisons, treating mental illness and drug misuse, and improving economic conditions. Although crisis hotlines are common, there is little evidence for their effectiveness.