Brain

The brain coordinates thought, emotion, behaviour and survival, while substances can disrupt and reshape its signalling systems.

Remembering a conversation, noticing danger and deciding what to do next depend on brain systems working together. Alcohol and other drugs can change that coordination. Their effects can reach beyond feeling intoxicated to attention, memory, movement and the ability to carry out an intention.

Repeated use can also change what the brain learns to expect. A place, feeling or familiar routine can become associated with reward or relief, making substance use harder to resist. These changes help explain addiction, but adaptation alone is not addiction, and brain biology does not explain every part of a person's life.

Change remains possible. Some difficulties improve during recovery, while others need assessment and continuing support. A difficult day does not reveal how much someone's brain has healed.

Sudden confusion needs immediate medical help. Urgent help is especially important if someone cannot be woken, is breathing abnormally, has a seizure, becomes severely confused or delirious, or shows other signs of major deterioration. Someone who may be physically dependent on alcohol should seek medical advice before abruptly stopping or sharply reducing drinking.

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