Which symptom is often a key indication of developing problem drinking behavior?

Reoccurring memory blackout is a key indication of developing problem drinking behavior because it reflects the brain's inability to form new memories while under the influence of alcohol. This symptom, also known as a blackout, occurs when a person consumes a large amount of alcohol in a short period, impairing the hippocampus, which is responsible for memory formation. Frequent blackouts can signify that an individual is drinking excessively and may be developing an alcohol use disorder.

This symptom is particularly concerning as it often points to a pattern of irresponsible drinking, which can lead to dangerous situations and poor decision-making. Recognizing this sign is critical for intervention, as it alerts individuals and their support systems to the potential seriousness of the drinking behavior before more severe consequences arise. In contrast, the other symptoms mentioned can occur for various reasons and do not specifically signify problematic drinking patterns. For example, frequent headaches might be related to dehydration or stress, erratic sleep patterns could result from numerous factors including anxiety or lifestyle choices, and increased irritability might stem from a variety of emotional or situational triggers.