Consequences of Substance Use: Health, Mood and Family Effects

Written by the Lyte Psychiatry clinical team. Clinically reviewed by Ana G., LPC, and medically reviewed by Dr. Akinwande Akintola, MD, supervising physician. Last reviewed: November 4, 2026.

The consequences of substance use can reach almost every part of life: physical health, mood and anxiety, relationships, work or school, money and safety, and the health of others, including babies exposed during pregnancy. The encouraging part is that substance use disorders are treatable, many people recover, and getting help early can limit harm for the person and their family.

This guide is for adults who are wondering about their own use of alcohol or drugs, and for family members who are worried about someone they love. It explains the main effects of regular or heavy use, how to talk about it without blame, when to get help urgently and where to find support in Texas.

This article is general information, not a medical recommendation. Do not start, stop or change any medication without talking to your prescriber.

What are the consequences of substance use on physical health?

Regular or heavy substance use can affect the heart, lungs, liver, brain and other organs, and it raises the risk of injuries, infections and overdose. The specific risks depend on the substance, the amount, how it is taken and a person's health.

Examples include liver strain from heavy drinking, breathing problems from smoking or vaping, and nerve damage from some inhaled substances. Sharing needles or other equipment raises the risk of infections such as hepatitis C.

The National Institute on Drug Abuse (NIDA) explains that imaging scans, chest X-rays and blood tests can show the damaging effects of long-term drug use throughout the body, and that injection drug use is a major factor in the spread of hepatitis C.

How does substance use affect mental health?

Substance use and mental health affect each other in both directions. People sometimes drink or use drugs to cope with anxiety, depression, trauma or sleep problems, and over time the substance can make those same symptoms worse.

Withdrawal and "crashes" between uses can bring irritability, low mood and anxiety. Some substances can trigger paranoia or psychosis in some people.

NIDA notes that in some cases mental disorders such as anxiety, depression or schizophrenia may come before addiction, and that treatment for all conditions should happen at the same time. The Centers for Disease Control and Prevention (CDC) states that excessive alcohol use can lead to mental health conditions, including depression and anxiety. Lyte's guide to co-occurring disorders covers this overlap in more depth.

How does substance use affect families and relationships?

Substance use often strains relationships through broken trust, conflict, secrecy, money problems and changes in who handles daily responsibilities. Family members may feel worried, angry, guilty or exhausted, sometimes all at once.

Children in the home can be affected by unpredictability, missed routines and stress, even when adults try to shield them. Partners may take on more caregiving and lose time for their own health.

NIDA reports that family therapy helps people, especially young people, with drug use problems, as well as their families, with the aim of improving overall family functioning. Families do not need to wait for their loved one to accept help before getting support for themselves.

What other effects can substance use have on daily life?

Beyond health and relationships, the consequences of substance use can include missed work or school, lower performance, legal problems, money trouble and risky situations such as impaired driving. These effects often build slowly and can be hard to see from the inside.

Use during pregnancy carries specific risks. NIDA explains that a mother's substance or medication use during pregnancy can cause her baby to go into withdrawal after birth, and that some drug-exposed children will have developmental problems with behavior, attention and thinking.

NIDA also notes that drugged driving puts the driver, passengers and others who share the road at risk. Pregnant people who use substances deserve supportive, nonjudgmental care, and talking with a prenatal provider is an important step.

How do you know if substance use has become a problem?

Substance use may have become a problem when it is hard to control, keeps causing harm, or takes priority over things that matter to you. Questions to ask yourself:

• Do I use more, or for longer, than I meant to?
• Have I tried to cut back and found it hard?
• Do I keep using even though it causes problems with health, work or people I care about?
• Do I need more to get the same effect?
• Do I feel unwell, anxious or shaky when I stop?

The National Institute on Alcohol Abuse and Alcoholism (NIAAA) lists drinking more or longer than intended, trying and failing to cut down, continuing despite problems and withdrawal among the symptoms of alcohol use disorder. Lyte's article on taking a break from alcohol may help if you are curious about changing your drinking.

How can you talk to someone about their substance use?

Talk at a calm, sober moment, focus on specific behaviors and your concern, and avoid labels or ultimatums made in anger. People are more likely to listen when they feel respected rather than judged.

A checklist of what to say:

• "I care about you, and I've been worried lately."
• "Last weekend you missed [event], and you seemed really unwell the next day."
• "I'm not trying to control you. I'd like to help you find support if you want it."
• "Would you be willing to talk to a doctor or counselor? I can help find someone."
• "Whatever you decide, I'm going to get some support for myself, too."

The Substance Abuse and Mental Health Services Administration (SAMHSA) National Helpline, 1-800-662-HELP (4357), is a free, confidential treatment referral and information service available 24/7 in English and Spanish for individuals and families. Parents of teens can also read Lyte's guide on how to talk to your teen about cannabis.

What are the first steps toward getting help? A step-by-step plan

The first steps are to learn what kind of care fits your situation and to make one contact. You do not have to have everything figured out first.

1. Be honest with yourself about patterns. Write down what, how much and how often you use for one or two weeks.
2. Check for withdrawal risk. Some substances can cause dangerous withdrawal; ask a medical provider before stopping suddenly after heavy, regular use.
3. Talk with a health care provider. A primary care provider, psychiatric clinician or addiction specialist can assess your situation.
4. Search for treatment options. Use a confidential locator to compare programs and levels of care.
5. Involve someone you trust. A friend or family member can help with calls and appointments.
6. Plan for setbacks. Decide in advance who you will call if you use again.

FindTreatment.gov, from SAMHSA, is a confidential and anonymous locator for substance use and mental health treatment in the United States. NIDA states that addiction is a treatable disorder and that relapse does not mean treatment has failed; it signals that treatment should be resumed, modified or replaced.

When is substance use an emergency?

Substance use is an emergency when someone may be overdosing, is having severe withdrawal, or is at risk of harming themselves or others. Call 911 for:

• Slow, shallow or stopped breathing, or blue or gray lips.
• Being unable to wake up or respond.
• Seizures, chest pain or severe confusion.
• Hallucinations or dangerous behavior during intoxication or withdrawal.

The CDC explains that naloxone can help people who are overdosing on an opioid and advises giving naloxone if available and then calling 911. For thoughts of suicide, call or text 988 at any hour.

What should Texans know about finding substance use care?

Texans can search for substance use treatment through confidential national locators and through local mental health authorities. Texas Health and Human Services lists a 24/7 crisis line for each county, run by the local mental health authority, which can help in a mental health or substance-related crisis. Levels of care range from outpatient counseling to residential programs and medically supervised withdrawal, and the right level depends on the person's needs and safety.

Rules about substance use treatment, privacy and prescribing vary by state and can change, so ask any program how it handles records and consent.

Getting support in Texas

Lyte Psychiatry offers therapy, psychiatric evaluation and medication management in Texas. Lyte Psychiatry is an outpatient practice. It does not provide inpatient care, crisis or after-hours coverage, medically supervised detox, or intensive outpatient or partial hospitalization programs. In-person visits are available at Lyte Psychiatry's clinic in Pantego, in the Dallas–Fort Worth area. Lyte Psychiatry offers telehealth visits to patients who are physically located in Texas at the time of the visit.

Most new patients are seen within 1–2 business days. Weekend appointments are limited. All Lyte Psychiatry services are available in Spanish. Availability, insurance and clinician fit require confirmation. Lyte's guide to substance use recovery covers first steps in more detail.

Learn about therapy and psychiatry at Lyte or contact the practice.

If you are in a mental-health crisis in the United States, call or text 988. Call 911 for immediate danger.

Educational information, not a diagnosis or individual treatment plan.