Symptoms of Alcohol use disorder vary in frequency and severity. These symptoms usually ebb and flow into periods of intoxication and periods of withdrawal. Alcohol intoxication happens as the amount of alcohol in your bloodstream increases. The higher the blood-alcohol concentration is, the more likely the drinker is to experience unstable moods, slurred speech, and even blackouts. When people who are heavily dependent on alcohol suddenly stop drinking. Symptoms may include sweating, tremors, nausea, anxiety, hallucinations, and occasionally seizures.