Inflammation

Inflammation helps the body respond to injury and infection, but can also cause harm when the response is excessive or persists. Substance use can affect these processes. Inflammation alone cannot explain addiction or recovery. Sudden confusion or severe breathing difficulty needs immediate medical help.

Inflammation is a response involving immune cells, chemical signals and changes in tissues. It can help contain a threat and support repair. It can also become harmful. Infection is one possible trigger, but tissue injury and some immune conditions can cause inflammation without an infection.

Heavy alcohol use can disturb immune responses. Increased inflammatory activity and weaker protection against infection can occur together. These are different aspects of immune function, rather than a simple scale from a weak to a strong immune system. Findings about alcohol do not automatically apply to every other substance or every person.

Researchers are studying how immune signals relate to brain function and addiction. Much remains uncertain. Fatigue, low mood, poor concentration and bloating have many possible explanations. They do not establish inflammation, prove that substance use caused a problem or show that the body is healing. Blood tests such as C-reactive protein can help investigate some illnesses, but do not identify the cause on their own or predict someone's recovery.

Persistent or changing symptoms deserve assessment. Sudden confusion, severe breathing difficulty or rapidly worsening serious illness needs immediate medical help. Severe sudden abdominal pain or vomiting blood also needs immediate help. If alcohol dependence may be present, seek medical advice before abruptly stopping or sharply reducing drinking.

Full access is needed to read this Topic's articles.