Morphine, which first appeared in drug form, has been proven to be significantly addictive after heavy use, similar to drugs such as heroin and marijuana. Morphine has a sedative effect along with analgesia, and is mostly used by doctors to relieve patients’ nervousness and pain, etc. Most of the early symptoms of morphine addiction manifest as problems with the digestive tract, mental system, and breathing. After morphine addiction, patients may experience poor appetite and poor mental health, which may be accompanied by nausea, vomiting, and tearfulness. Patients also tend to experience lethargy, scattered thinking when talking and vomiting, and significant memory loss. These symptoms may disappear after morphine use. More serious addiction may lead to death from respiratory depression caused by heavy morphine use.