What Happens During Withdrawal
Withdrawal is the body's reaction to the absence of a substance it has become physically dependent on. Understanding what actually happens, physiologically, neurologically, and emotionally, helps families approach this process with realistic expectations, appropriate urgency, and compassion.
Medically Reviewed by:
Dr. Darrin Mangiacarne
Chief Medical Officer
At Banyan Treatment Centers, Chief Medical Officer Dr. Darrin Mangiacarne leads our nationwide clinical team with over a decade of addiction medicine experience, helping ensure evidence-based, compassionate care across every level of treatment.
Author / Written by: Banyan Editorial Staff
Medically reviewed by: Dr. Darrin Mangiacarne, CMO
Updated on: June 2026
Family Resources Hub › Substance Use Resources › Withdrawal & Detox › What Happens During Withdrawal
Why Withdrawal Happens: The Brain Science
When a person uses a substance regularly over time, the brain adapts. It recalibrates its chemistry, producing less of certain neurotransmitters on its own, or becoming less sensitive to them, because the substance has been artificially filling that role. This adaptation is called neuroadaptation, and it is the physiological basis of both tolerance and withdrawal.
When the substance is suddenly removed, the brain is caught off-balance, its chemistry is calibrated for a reality that no longer exists. The result is a rebound effect: the systems that were suppressed by the substance become overactive, and the systems that were stimulated crash. This overactivation or underactivation of brain circuits produces the symptoms of withdrawal.
Different substances act on different brain systems, which is why withdrawal looks and feels very different depending on what substance is involved, how long it was used, and how much was typically consumed. According to NIDA, the severity of withdrawal is determined primarily by: the substance involved, the duration of use, the dose used, the person's overall health, and whether other substances are involved.
Questions About Withdrawal? We Have Answers.
Our admissions team can help you understand what withdrawal looks like for your loved one's specific situation and what level of medical support they need.
855-722-6926Free & confidential · Available 24/7 · No commitment required
What Withdrawal Looks Like: Substance by Substance
The experience of withdrawal varies dramatically depending on the substance. Here is what families can expect for each major category.
Alcohol Withdrawal — Most Dangerous
Requires medical supervision. Can cause seizures and death without treatment.
Common Symptoms
- Anxiety, agitation, and irritability
- Tremors — especially in the hands
- Sweating and elevated heart rate
- Nausea and vomiting
- Headache
- Insomnia
- Hallucinations (visual, auditory, tactile)
- Seizures (typically 24–48 hours)
- Delirium tremens (rare but fatal without treatment)
Timeline
- 6–12 hrs: Anxiety, tremors, sweating begin
- 12–24 hrs: Symptoms peak; hallucinations possible
- 24–48 hrs: Highest seizure risk
- 48–72 hrs: Delirium tremens possible
- Week 1: Gradual improvement with treatment
- Weeks 2–4: Protracted symptoms — anxiety, sleep disturbance
Opioid Withdrawal — Intensely Uncomfortable, High Relapse Risk
Medical supervision strongly recommended. Rarely directly fatal but extremely difficult and drives high relapse risk.
Common Symptoms
- Severe muscle aches and cramps
- Nausea, vomiting, and diarrhea
- Sweating and chills simultaneously
- Teary eyes and runny nose
- Goosebumps ("cold turkey" appearance)
- Insomnia and extreme restlessness
- Anxiety, agitation, and irritability
- Intense, overwhelming cravings
Timeline
- 8–24 hrs: Symptoms begin (short-acting opioids sooner)
- 36–72 hrs: Peak symptoms — most severe
- Days 4–7: Physical symptoms begin to subside
- Weeks 2–4: Psychological symptoms persist
- Months: Post-acute withdrawal — depression, cravings
Benzodiazepine Withdrawal — Dangerous, Slow-Onset
Requires medical supervision. Can cause fatal seizures. Withdrawal timeline is longer and less predictable than alcohol.
Common Symptoms
- Severe anxiety and panic attacks
- Insomnia and sleep disturbances
- Tremors and muscle tension
- Sweating and heart palpitations
- Sensory hypersensitivity (light, sound, touch)
- Headaches and cognitive impairment
- Seizures (life-threatening)
- Psychosis in severe cases
Timeline
- Short-acting benzos (Xanax): 1–2 days
- Long-acting (Valium, Klonopin): 3–7 days
- Peak: Days 2–7 depending on type
- Duration: Weeks to months for full resolution
- Protracted syndrome: Can persist for months to years in heavy users
Stimulant Withdrawal (Meth, Cocaine, Prescription Stimulants)
Physical danger is lower than alcohol or benzodiazepines — but psychological symptoms are severe and drive high relapse rates.
Common Symptoms
- Extreme fatigue and prolonged sleep (the "crash")
- Deep depression and emotional flatness
- Intense, powerful cravings
- Increased appetite after period of suppression
- Cognitive slowing and poor concentration
- Suicidal thoughts in some individuals
- Paranoia that may persist from active use
Timeline
- Hours after last use: Crash begins
- Days 1–3: Severe fatigue, depression, intense sleep
- Days 4–7: Mood stabilizes slightly; cravings remain high
- Weeks 2–4: Ongoing depression, anhedonia
- Months: PAWS — protracted depression and cravings (especially meth)
Cannabis Withdrawal
Cannabis withdrawal is real and clinically recognized in the DSM-5, though it is significantly less severe than alcohol or opioid withdrawal. It is most significant in heavy, long-term daily users.
Common Symptoms
- Irritability, anger, and anxiety
- Insomnia and vivid dreams
- Decreased appetite and weight loss
- Restlessness and physical tension
- Depressed mood
- Headaches and sweating
Timeline
- Days 1–3: Symptoms begin and peak
- Days 4–14: Gradual improvement
- 2–4 weeks: Most symptoms resolved
- Sleep disruption may persist for weeks in heavy users
PAWS: Post-Acute Withdrawal Syndrome
Many families are unprepared for what happens after the acute withdrawal phase ends. Post-Acute Withdrawal Syndrome (PAWS) refers to a cluster of symptoms that can persist for weeks to months, or in some cases, years, after the acute phase of withdrawal resolves. PAWS is one of the primary drivers of long-term relapse and is frequently misunderstood as a sign that the person "isn't trying."
SAMHSA's literature identifies PAWS as a significant treatment challenge, especially for alcohol, opioids, and stimulants. Symptoms often fluctuate, which can be confusing and demoralizing for both the person in recovery and their family.
Common PAWS Symptoms
- Difficulty concentrating and cognitive fog
- Mood swings and emotional volatility
- Ongoing sleep disturbances
- Persistent anxiety or depression
- Inability to feel pleasure (anhedonia)
- Fatigue and low energy
- Episodic intense cravings
- Reduced stress tolerance
What Families Should Know About PAWS
- PAWS is neurobiological, not laziness or lack of effort
- Symptoms fluctuate; good days and bad days are normal
- PAWS is a major trigger for relapse, this is when ongoing treatment matters most
- Stress worsens PAWS symptoms significantly
- Exercise, sleep hygiene, and therapy help reduce severity
- Most people improve substantially over time with support
Supporting Your Loved One Through Withdrawal
Advocate for Medical Support
For alcohol, benzodiazepines, and opioids, medical supervision is not optional, it is the safe approach. Help your loved one access medical detox rather than attempting withdrawal at home. The discomfort is real; the risk is real; the support makes both manageable.
Understand It Is Not Weakness
The symptoms of withdrawal are driven by neurochemistry, not character. A person in withdrawal is not being dramatic. They are experiencing a genuine physiological crisis that requires compassion, not lectures or ultimatums. Save those conversations for after they are stable.
Plan for What Comes After
Detox alone does not produce lasting recovery. Work with the treatment team to ensure a plan is in place for the next level of care, residential, PHP, IOP, before your loved one completes detox. The transition from detox to treatment is one of the highest-risk moments in recovery.
Speak With an Admissions Specialist
Fill out the form below and a member of our team will reach out within one business hour, confidentially and without pressure.
Related Guides
Can Withdrawal Be Life-Threatening?
Which substances carry fatal withdrawal risk and exactly when families need to call 911.
Read the guide →How Long Does Withdrawal Last?
Realistic timelines for each substance, including PAWS and what long-term recovery looks like.
Read the guide →What Is Medical Detox?
What happens during medical detox, which medications are used, and when it is necessary versus optional.
Read the guide →Is It Dangerous to Stop Cold Turkey?
Why stopping alcohol or benzodiazepines abruptly without medical support can be fatal.
Read the guide →Understanding Treatment Options
What comes after detox, the full continuum of care that addresses addiction rather than just physical dependence.
Read the guide →Relapse & Recovery
Why relapse often happens in the months after detox, and how families can support long-term recovery.
Read the guide →Additional Resources
Tools, community, and organizations to support your family's journey.
Crisis & Hotlines
Immediate help — national helplines and crisis resources for addiction and mental health emergencies.
View all crisis resources →Support Groups
Al-Anon, Nar-Anon, SMART Recovery Family & Friends, and peer groups for families.
Find a group near you →Blog & Articles
Clinician-authored articles, personal stories, and recovery news to keep families informed.
Read the Banyan blog →Insurance & Financing
Insurance verification, financing options, and navigating the cost of treatment.
Check your coverage →Downloadable Guides
Free PDFs on intervention, what to pack for treatment, and relapse prevention planning.
Free family addiction guide →About Banyan
Our clinical approach, accreditations, and the team behind Banyan's family-centered care model.
Meet our clinical team →