What Are Withdrawal Symptoms? Signs Your Body Is Detoxing

Complete Healthcare Team

If you’ve been using a substance regularly enough that your body has adapted to it, stopping or even cutting back can produce a predictable set of physical and psychological symptoms. That’s withdrawal. It’s not a sign of weakness, and it’s not random. It’s a biological response to your nervous system trying to recalibrate without a substance it had come to expect. Understanding what withdrawal looks like, how long it lasts, and which forms are medically dangerous is the difference between a difficult few days and a preventable emergency.

What Withdrawal Actually Is

Withdrawal symptoms occur when a person who has developed physical dependence on a substance reduces their use or stops altogether. Dependence isn’t the same as addiction. A person can be physically dependent on a prescribed medication, like an opioid pain reliever or a benzodiazepine, without meeting the criteria for a substance use disorder. Either way, the body has adapted, and removing the substance produces a rebound effect.

What that rebound looks like depends on the substance. Different drugs act on different neurochemical systems, so the signs of detox vary based on what the body has been working around.

Common Withdrawal Symptoms by Substance

Alcohol 

Symptoms typically begin 6 to 12 hours after the last drink. Early signs include anxiety, shakiness, sweating, nausea, headache, and trouble sleeping. As withdrawal progresses, blood pressure and heart rate often rise, and some people develop hallucinations or seizures. The most severe form, delirium tremens (DTs), can include confusion, fever, agitation, and dangerous changes in heart rhythm. According to clinical literature, DTs occur in roughly 3 to 5 percent of people hospitalized for alcohol withdrawal and can be fatal without prompt treatment. Alcohol withdrawal is one of the few that can be life-threatening, which is why medical supervision matters.

Opioids (heroin, fentanyl, oxycodone, hydrocodone, morphine)

Symptoms typically start within 8 to 24 hours of the last use for short-acting opioids and later for longer-acting ones like methadone. The experience is often described as a severe flu. Common signs include muscle aches, sweating, runny nose, watery eyes, yawning, goosebumps, abdominal cramping, nausea, vomiting, diarrhea, anxiety, and intense cravings. Opioid withdrawal is rarely directly life-threatening in healthy adults, but the dehydration and electrolyte loss from severe vomiting and diarrhea can become medically serious, and the risk of relapse and overdose is high.

Benzodiazepines 

(Xanax, Klonopin, Valium, Ativan) Withdrawal can be one of the most prolonged and medically complex. Symptoms include anxiety, insomnia, tremor, sweating, nausea, sensory hypersensitivity, and in severe cases, seizures and psychosis. SAMHSA notes that acute withdrawal can last 1 to 4 weeks, and longer with gradual tapering. Stopping benzodiazepines abruptly after long-term use should never be done without medical supervision.

Stimulants 

(cocaine, methamphetamine, prescription stimulants) Withdrawal looks different from opioid or alcohol withdrawal because the dominant symptoms are psychological rather than physical. Common features include fatigue, increased appetite, vivid or unpleasant dreams, depressed mood, slowed thinking, and strong cravings. Symptoms typically peak in the first week and gradually improve.

Nicotine 

Symptoms include irritability, anxiety, difficulty concentrating, increased appetite, headache, and intense cravings, usually peaking in the first 2 to 3 days and easing over 2 to 4 weeks.

Cannabis 

Cannabis withdrawal is real, though often underrecognized. Signs include irritability, sleep disturbance, decreased appetite, restlessness, and mood changes, typically lasting about a week.

How Long Withdrawal Lasts

Acute withdrawal timelines vary by substance, but SAMHSA’s reference ranges give a useful baseline:

• Alcohol: 5 to 7 days
• Opioids: 4 to 10 days (methadone can last 14 to 21 days)
• Benzodiazepines: 1 to 4 weeks, longer with tapering
• Stimulants: 1 to 2 weeks
• Nicotine: 2 to 4 weeks
• Cannabis: about 5 days

For many people, that’s not the end of the story. Post-acute withdrawal syndrome (PAWS) refers to symptoms that linger beyond the acute phase, sometimes for months. PAWS often involves mood swings, sleep difficulties, low energy, anxiety, and cravings. It’s one of the most common reasons people relapse, because it can feel like detox never quite finishes. In our practice, we talk about PAWS up front so patients aren’t caught off guard when symptoms persist after the acute phase ends.

When Withdrawal Becomes a Medical Emergency

Not all withdrawals carry the same level of risk. Two substances stand out as medically dangerous to detox from without supervision:

Alcohol

Seizures can occur within 24 to 48 hours of the last drink, and DTs typically begin 48 to 72 hours after. The risk is higher in people who have been through severe withdrawal before, have other health conditions, or have been drinking heavily for extended periods.

Benzodiazepines 

Like alcohol, abrupt benzodiazepine withdrawal can cause seizures and severe autonomic instability. Tapering under medical guidance is the standard of care.

For these substances, medically supervised withdrawal (sometimes called medical detox) is not a luxury. It’s a safety measure. Opioid withdrawal, while extremely uncomfortable, is generally not directly life-threatening in healthy adults, but medical management still reduces complications and improves the chances that someone makes it through and into ongoing treatment.

Common Questions About Withdrawal

How do I know if I’m in withdrawal or just feeling sick? 

Timing is the biggest clue. Withdrawal symptoms appear within hours to a couple of days of stopping or reducing a substance and tend to follow a recognizable pattern (for example, opioid withdrawal causes a runny nose, yawning, goosebumps, and muscle aches in addition to feeling flu-like). If symptoms began shortly after cutting back on alcohol, opioids, benzodiazepines, stimulants, nicotine, or cannabis, withdrawal is the likely explanation. A clinician can confirm and help you manage it safely.

Can I detox at home?

 For some substances, yes, with caveats. Nicotine, cannabis, and stimulant withdrawal can usually be managed at home. Opioid withdrawal can sometimes be managed at home with medical support, including FDA-approved medications like buprenorphine that reduce symptoms significantly. Alcohol and benzodiazepine withdrawal should be evaluated by a clinician first, because home detox can be dangerous depending on how heavily and how long you’ve been using.

What medications help with withdrawal? 

It depends on the substance. For opioid use disorder, the FDA has approved methadone, buprenorphine, and naltrexone, and lofexidine is FDA-approved specifically to ease opioid withdrawal symptoms. For alcohol withdrawal, benzodiazepines are the standard of care to prevent seizures and reduce severity, and naltrexone, acamprosate, and disulfiram are FDA-approved to support recovery afterward. For benzodiazepine withdrawal, slow tapering under a clinician’s supervision is the typical approach. There’s no shortcut around the discomfort entirely, but there are medications that make withdrawal significantly safer and more tolerable.

Who Should Talk to a Clinician Before Detoxing

Some situations warrant medical evaluation before stopping a substance:

• Daily or near-daily heavy alcohol use, particularly if you’ve experienced withdrawal before
• Long-term benzodiazepine use, even at prescribed doses
• Any history of withdrawal seizures, DTs, or hospitalization for detox
• Use of opioids during pregnancy, where untreated withdrawal can harm the fetus
• Use of multiple substances at once, which complicates the withdrawal picture
• Significant other medical conditions, including liver disease, heart disease, or psychiatric conditions

Something Most People Don’t Realize

Withdrawal management (detox) is not the same as treatment for a substance use disorder. Getting through detox is the start, not the finish. Without ongoing care, including medication when appropriate, counseling, and support, the risk of relapse, and for opioids, the risk of fatal overdose, is highest in the weeks immediately after detox because tolerance drops quickly. We’ve been providing addiction treatment in Central Ohio for over 30 years, and the people who do best are typically the ones who plan what comes after detox before they start it.

Talking to Someone Who Can Help

If withdrawal is something you’re trying to navigate, whether you’re thinking about cutting back, ready to stop, or already in the middle of it, you don’t have to figure it out alone. Complete Healthcare offers outpatient addiction treatment with same-day appointments at our 11 locations across Central Ohio, including Columbus, Pickerington, Newark, Lancaster, Marion, Marysville, and Delaware. Call us at 614-882-4343 or schedule online to talk through your options.