How To Tell If Someone Has Been Drinking
How To Tell If Someone Has Been Drinking
Alcohol affects the body and mind in noticeable ways. In this blog, we explain how to tell if someone has been drinking and why recognizing the signs is important for safety and support. At 405 Recovery in Fountain Valley, we see daily how alcohol can impact health, behavior, and relationships.
Physical Signs of Alcohol Intoxication
Common signs of alcohol intoxication include slurred speech, unsteady movements, and flushed skin. You may also notice an odor of liquor, beer, or wine on their breath or clothes. Their eyes may appear red or glossy, and their pupils may dilate.
Increased perspiration, rapid heart rate (tachycardia), and shallow breathing can also signal intoxication. The person may feel warm even when it’s cool, and they may have trouble regulating body temperature. Alcohol acts as a depressant on the central nervous system, causing sluggish reactions.
Behavioral Clues That Indicate Drinking
Alcohol can alter behavior quickly. Signs include lowered inhibitions, loud speech, poor judgment, or sudden changes in mood. Some people become more aggressive or impulsive after drinking.
Others may seem unusually energetic or extremely tired. Emotional swings—such as sudden laughter followed by crying—are also red flags. These behavioral shifts point to a possible alcohol issue and should not be ignored.
Impact on Mood and Mental State
Alcohol affects brain chemistry and mood regulation. It can lead to irritability, depression, anxiety, or even confusion. Some people may show signs of amnesia or blackouts after binge drinking.
If someone seems out of touch with their surroundings or has trouble maintaining a conversation, alcohol intoxication may be the cause. In severe cases, confusion and unconsciousness may lead to coma, especially with high blood alcohol content levels.
Sleep Disruptions and Fatigue
Drinking interferes with normal sleep patterns. People who have been drinking may fall asleep quickly but often wake up during the night or experience insomnia. Fatigue the next day is common due to poor sleep quality.
Signs like excessive yawning, delayed reactions, or lack of energy can point to alcohol use the night before. At 405 Recovery, we help patients manage these symptoms while rebuilding healthy routines.
Physical Symptoms of Excessive Drinking
Excessive drinking leads to nausea, vomiting, and dehydration, all signs of alcohol toxicity. High alcohol by volume beverages like vodka, rum, or strong wine can irritate the stomach lining more severely, causing cramps, bloating, and internal pressure. These symptoms may worsen if the person has poor liver function or existing disease like alcoholic hepatitis.
Additional physical symptoms include headaches, muscle weakness, and erratic heart rate or blood pressure changes. Over time, alcohol intoxication damages the central nervous system, disrupting breathing and causing tremors or seizure in serious cases. Some patients report fatigue, skin flushing, or sweating (perspiration) that may signal high blood alcohol content or impending withdrawal.
A hangover is the body’s response to this internal poison. The Centers for Disease Control and Prevention warns that repeated hangovers lower immune system performance and impair daily functioning. At 405 Recovery, we evaluate these symptoms and guide patients toward safe therapy and lasting sobriety.

Observable Risk Factors While Driving
One of the most dangerous outcomes of alcohol use is driving under the influence, which can result in severe injury or death. Confusion, delayed response, and poor concentration are often early signs that someone should not be on the road. They may also show poor attention, slurred speech, or erratic behavior behind the wheel.
Alcohol slows brain function and reduces consciousness, especially with high alcohol by volume drinks like liquor or beer consumed in short periods. Combining alcohol with certain medications or stimulants like amphetamine increases impairment and risk. Even one standard drink can compromise motor skills and the ability to assess consent and judgment.
405 Recovery stresses the importance of recognizing these warning signs early. Our outpatient health care programs educate patients and families about the legal, emotional, and physical dangers of driving under the influence. Preventing drunk driving not only saves lives—it protects the long-term health and quality of life of everyone involved.
Effects on the Immune and Digestive Systems
Chronic alcohol use weakens the immune system, making the body more vulnerable to infections. It also harms the digestive system, leading to nutrient deficiencies and liver inflammation.
Alcoholic hepatitis and liver failure are severe outcomes of prolonged use. Symptoms like jaundice (yellowing skin), abdominal pain, and fatigue may point to these issues. Our therapy programs help patients recover before long-term damage sets in.
How Alcohol Affects the Brain and Memory
Alcohol disrupts brain activity and memory function. Even small amounts can impair attention, decision-making, and memory recall. If someone struggles to remember events or conversations, alcohol intoxication might be the cause.
Frequent memory gaps or confusion may signal an ongoing alcohol problem. Therapy at 405 Recovery addresses both physical dependence and cognitive effects.
Monitoring Blood Alcohol Content and Alcohol By Volume
Blood alcohol content (BAC) is the measure of alcohol in the bloodstream. Higher BAC levels result in stronger intoxication symptoms and higher risk of toxicity. Standard drink sizes—like one 12 oz beer, 5 oz wine, or 1.5 oz vodka—each raise BAC differently.
Alcohol by volume (ABV) varies between liquor types. Higher ABV drinks like rum or amphetamine-laced cocktails intensify symptoms faster. Knowing these numbers helps in understanding risk levels and making safer choices.

Signs of Long-Term Alcohol Use
Chronic drinking leads to more than hangovers. Over time, it damages the liver, heart, and bone structure. It raises blood pressure and disrupts hormone levels.
The skin may show signs of premature aging or dryness. Alcohol misuse also leads to increased stress and poor quality of life. At 405 Recovery, our outpatient programs help reduce harm and support long-term sobriety.
Medical Emergencies Linked to Alcohol
Alcohol poisoning is a medical emergency. Symptoms include vomiting, seizures, slow breathing, and low body temperature. A person may lose consciousness and require immediate medical intervention.
Other risks include injury from falls, unsafe behavior, and poor decision-making. Always seek help if someone appears to be in danger from drinking. Calling a physician or visiting a primary care provider can prevent fatal outcomes.
Mental and Emotional Warning Signs
Emotional instability, low motivation, or apathy can point to an alcohol issue. Some people use alcohol to manage stress or emotional pain, but this often leads to addiction. Therapy is essential in treating both emotional triggers and physical dependence.
Mood disorders like depression and anxiety may worsen with continued drinking. Patients at 405 Recovery receive integrated care to address both mental health and substance abuse.

Impact on Consent and Decision-Making
Alcohol impairs judgment and the ability to give informed consent. This is especially important in situations involving driving, relationships, or medication use. A person who is intoxicated may not understand the consequences of their actions.
It’s important to recognize these signs early. If someone regularly drinks to the point of confusion or risky behavior, intervention is necessary.
Why Early Detection Matters
Learning how to tell if someone has been drinking can prevent long-term harm to the brain, liver, and immune system. Early signs such as mood swings, fatigue, and confusion may indicate increasing alcohol intoxication or physical dependence. Delayed action can raise the risk of dehydration, seizure, vomiting, or even coma due to high blood alcohol content.
Detecting these symptoms early helps protect the person’s health, avoid serious injury, and lower the chance of driving under the influence. Behavior changes, such as poor concentration, amnesia, or slurred speech, are strong indicators of a growing alcohol issue. These early warnings create an opportunity for family and friends to step in, offer support, and encourage sobriety before the damage worsens.
405 Recovery provides outpatient therapy and health care for those struggling with alcohol problems, from binge drinking to alcoholic hepatitis. Our treatment plans educate patients on managing stress, avoiding high alcohol by volume beverages like vodka and rum, and making safer choices. We aim to restore quality of life and help patients regain control through structured care, counseling, and proven recovery tools.
Support from 405 Recovery
If you’re concerned someone may have an alcohol problem, don’t wait to act—early intervention can prevent serious outcomes like liver failure, toxicity, or disease progression. The team at 405 Recovery offers outpatient therapy programs that address both substance abuse and co-occurring mental health concerns such as insomnia, depression, and emotional dysregulation.
Our center helps patients manage symptoms such as nausea, headache, irregular blood pressure, and elevated heart rate that often come from heavy drink use. We educate patients on safe medication use, the dangers of mixing alcohol with substances like amphetamine, and how to maintain sobriety with the guidance of licensed physicians and primary care providers.
Whether it’s beer, wine, or high-proof liquor, we treat every form of drinking that poses a risk to the individual’s well-being. We support our patients in healing their stomach, stabilizing their mood, and improving their overall attention span and consciousness. Contact 405 Recovery in Fountain Valley today to get life-saving information and help your loved one begin a healthier, alcohol-free journey.
FAQ
Yes, you can often detect signs of recent alcohol use several hours later. Indicators include the lingering smell of alcohol on the breath or skin, bloodshot eyes, sluggish responses, or lingering fatigue. Depending on the person’s metabolism and how much they drank, alcohol can stay in the body and affect behavior for up to 12 hours or more.
Yes, the smell of alcohol is a strong clue. Each type of drink—beer, wine, or liquor like vodka or rum—has a distinct odor that can remain on the breath, skin, or clothing. This odor can be especially noticeable in poorly ventilated spaces or enclosed vehicles.
Alcohol impairs judgment, concentration, and consciousness, which can affect a person’s ability to make informed decisions. If someone is visibly intoxicated—slurring, unsteady, or confused—they may not be legally or ethically capable of providing valid consent, especially in situations involving intimacy, medical treatment, or legal agreements.
Yes, mixing alcohol with medications—especially depressants, amphetamines, or sedatives—can mask or alter typical signs of alcohol intoxication. Some drugs suppress signs like drowsiness or slurring, making it harder to recognize that someone has been drinking. Always be cautious when medication is involved, as combining substances increases the risk of harm or toxicity.
Sources
- Alcohol and Public Health – Frequently Asked Questions
2. Impaired Driving: Get the Facts
3. Fact Sheets – Binge Drinking
4. Alcohol Use and Your Health