Meth pushes the body into overdrive. Within minutes it raises heart rate and blood pressure, kills appetite and keeps you awake for hours or days. With repeated use, meth effects on the body show up where everyone can see them: rotted teeth, open sores, dramatic weight loss. Inside, it strains the heart, blood vessels and kidneys and can cause a stroke.
If you’re asking what meth does because you’re worried about someone, or about yourself, here’s the physical picture, short term and long term.
What Does Meth Do When You Take It?
Methamphetamine is a powerful stimulant. According to the National Institute on Drug Abuse (NIDA), its effects can be felt right away or within about 20 minutes. Smoking or injecting it produces an immediate, intense rush. People feel alert, confident and full of energy. Their appetite drops away, and so does the need for sleep.
That energy comes at a cost. NIDA lists these short-term risks:
- Rapid heart rate
- Irregular heartbeat
- Increased blood pressure
- Stroke
- Kidney damage
- Paranoia and anxiety
Because the high is long and the drug suppresses hunger and fatigue, people often go days without proper food, water or sleep. The body pays for all of it when the drug wears off.
Long-Term Meth Effects on the Body
Repeated use leaves marks inside and out.
Meth mouth
NIDA describes severe tooth decay and tooth loss, often called “meth mouth.” Teeth can turn brown or black, crack and break down to the gum line. Dry mouth, clenching and grinding, sugary drinks and going long stretches without brushing all contribute. It’s one of the most recognizable signs of long-term use, and some of the damage needs extensive dental work to fix.
Skin sores
Many people who use meth feel like insects are crawling under their skin. They pick and scratch at the sensation, and NIDA notes this leads to skin sores. Those sores can become infected and scar, especially on the face and arms.
Weight loss
Long-term users often lose a lot of weight. Meth suppresses appetite, and days-long binges replace meals. The gaunt, hollow-cheeked look people associate with meth comes from that.
Heart and blood vessels
Meth is hard on the cardiovascular system. NIDA lists stroke and heart failure among the long-term risks. Each use spikes heart rate and blood pressure, and over time that wears down the heart and blood vessels, even in young people.
Infections
People who inject meth and share equipment risk infections, including infective endocarditis, a serious infection of the heart lining and valves. Shared needles also spread HIV and hepatitis.
Other effects
NIDA also reports decreased sexual function in men. Smoking meth can irritate the lungs and airways, and snorting it can damage the inside of the nose. Poor sleep, poor nutrition and constant physical stress leave many long-term users looking and feeling years older than they are.
Families usually notice the outside changes first. Someone who used to be careful about their looks stops caring, loses 30 pounds in a few months, keeps their sleeves down in summer or covers their mouth when they smile. Those changes are easy to judge. Underneath them is a body that’s been running without fuel or rest for a long time.
Meth Overdose
Long-term use can lead to unintentional overdose. NIDA, citing CDC research, says methamphetamine is the second most commonly found drug in people who fatally overdose, after synthetic opioids like fentanyl. Many of those deaths involve both. Call 911 if someone on meth has chest pain, a seizure, trouble breathing, a very high temperature, signs of a stroke (face drooping, arm weakness, slurred speech) or becomes unresponsive.
What Meth Does to the Brain
The body damage is easy to see. The brain damage often isn’t, and it can last longer. Meth changes the brain’s dopamine system and can cause anxiety, confusion, insomnia, mood swings and psychosis, sometimes long after someone stops. We cover that in detail in meth and brain damage.
Meth Withdrawal
When someone who uses regularly stops, NIDA says withdrawal symptoms like depression, anxiety and sleep problems typically peak 2 to 3 days later and last about a week. Low mood and cravings can stick around for months. The crash can be emotionally dangerous, and some people have thoughts of suicide. If that happens, call or text 988 any time. A supervised detox gives people a safe place to get through those first days.
Can the Body Heal After Meth?
Much of it can. With rest, real food and time, weight comes back, skin heals and energy improves. Blood pressure often settles. Dental damage usually needs a dentist, and some heart or blood vessel damage may be permanent. The earlier someone stops, the more there is to save.
If you’re trying to tell meth apart from other stimulants, our posts on meth vs. crack and the most dangerous stimulants can help.
Christian Meth Addiction Treatment at Covenant Hills
Covenant Hills is a Christian-based treatment center in Orange County, California, with a meth addiction program that cares for the whole person. Clients rebuild physical health with steady sleep and nutrition, work through what drove their use in therapy, and, if they choose, grow in their faith along the way.
If meth is taking a toll on your body or someone you love, call 800-662-2873 for a free, confidential assessment.
Frequently Asked Questions
What does meth do to your body?
It raises heart rate and blood pressure, suppresses appetite and sleep, and over time can cause severe tooth decay, skin sores, weight loss, heart damage, stroke and kidney damage.
How fast does meth affect the body?
NIDA says effects can be felt right away or within about 20 minutes, with an immediate rush when it’s smoked or injected.
What causes meth sores?
Many people on meth feel like bugs are crawling under their skin and pick or scratch at it, which causes sores that can get infected.
Is meth damage to the body permanent?
Some of it, like tooth loss or heart damage, can be. Much else improves with time, rest and good nutrition after someone stops using.
