Factors That Affect Mental Health: Biology, Life and Habits

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 main factors that affect mental health include biology and genes, childhood and life experiences, relationships and social connection, physical health, daily habits such as sleep and alcohol use, and access to basics like housing, work and health care. These factors interact, so there is rarely one single cause. Some you cannot change, but many you can influence.

This article is for anyone trying to understand why their mental health has changed, and for family members who want to make sense of a loved one's struggles without blaming anyone. It is general education, not a diagnosis.

What factors affect mental health?

Many factors affect mental health, and they operate at several levels at once. The Centers for Disease Control and Prevention (CDC) explains that mental health is influenced by many factors at multiple levels: individual, family, community and society.

A useful way to think about this is in layers:

• Biological: genes, brain chemistry, medical conditions and medicines
• Personal history: childhood experiences, trauma, loss and major life events
• Relationships: family, friends, partners and sense of belonging
• Daily habits: sleep, movement, food, alcohol and other substances
• Environment: housing, money, work, school, safety and access to care

The CDC also states that there is no single cause for developing a mental health condition. Most of the time, several of these layers combine.

Do genes and biology affect mental health?

Yes, genes and biology are among the factors that affect mental health, but they do not decide a person's future. MedlinePlus lists genes and family history, brain chemistry, and alcohol or drug use among the risk factors for mental disorders. MedlinePlus also states that mental disorders are not caused by character flaws.

Having a parent or sibling with depression, anxiety or bipolar disorder can raise risk. That is why clinicians often ask about family history. Still, risk is not destiny. Many people with a family history stay well, and many people without one develop a condition.

Biology also includes physical health. Thyroid problems, chronic pain, sleep disorders and some medicines can affect mood, which is one reason a medical checkup is often part of an evaluation.

How do childhood experiences affect mental health later?

Childhood experiences can shape mental health for years, especially when they involve ongoing stress or harm. The CDC describes adverse childhood experiences (ACEs) as potentially traumatic events that occur between birth and age 17, such as experiencing abuse or neglect, witnessing violence, or growing up in a household with substance use or mental health problems.

The CDC notes that children who experience toxic stress may have difficulty forming healthy and stable relationships. Those effects can carry into adulthood.

Past experiences are not a life sentence. Supportive relationships, safe environments and therapy can help people understand and work through what happened, at any age. Our article on how childhood trauma affects adult relationships explores this further.

How do relationships and loneliness affect mental health?

Relationships affect mental health strongly, and loneliness is a well-recognized risk factor. The CDC lists social isolation among risk factors for mental health conditions and describes social connectedness as protective against depression and anxiety.

Connection is about quality as well as quantity. One or two people you can be honest with may matter more than a large circle of acquaintances. Conflict, abuse or constant criticism at home or work, on the other hand, can wear down mental health over time.

Example: a hypothetical retiree who moves across the state to be near grandchildren may feel isolated for months, even while living close to family, until they find a community group or regular routine.

How do sleep, exercise and alcohol affect mental health?

Sleep, exercise and alcohol are daily factors that affect mental health in both directions. Poor sleep can worsen mood and anxiety, and low mood can disrupt sleep. The CDC notes that adults generally need seven or more hours of sleep and recommends consistent sleep and wake times.

Physical activity helps too. The CDC states that physical activity can help you feel better, sleep better and reduce the risk of depression and anxiety.

Alcohol works differently. It may feel relaxing at first, but the CDC notes that excessive alcohol use can lead to mental health conditions, including depression. Cutting back is often one of the most useful changes people can make.

How do physical health and chronic illness affect mental health?

Physical health and chronic illness affect mental health because body and mind are closely linked. The CDC notes that chronic conditions, such as traumatic brain injury, cancer or diabetes, can increase the risk of developing a mental health condition.

The relationship runs both ways. The CDC also states that depression increases the risk for many long-lasting physical conditions, including diabetes, heart disease and stroke. Pain, disability, frequent appointments and uncertainty about the future all add stress.

If you are living with a chronic illness and your mood has changed, tell your medical team. Mood care is part of good overall care, not a separate issue.

How do work, money and environment affect mental health?

Work, money and living conditions affect mental health because they shape daily stress and safety. The CDC lists lack of access to housing, health care, education or employment among risk factors for mental health conditions.

Job loss, unstable housing, debt, unsafe neighborhoods and discrimination can all create ongoing strain. On the other side, meaningful work, stable housing and a sense of safety can be protective. These factors are often outside one person's control, which is why community resources and social support matter so much.

If money or housing is part of the strain, it is worth mentioning to a clinician. Practical problems are a legitimate part of mental health care, and many clinics can point you toward community programs. Our article on workplace conflict and mental health offers a plan for one common work stressor.

Which factors can you change, step by step?

You can change some factors that affect mental health, even when others are fixed. Try this step-by-step review:

1. List what you cannot change. Family history, past experiences and some medical conditions. Naming them can reduce self-blame.
2. Look at sleep. Set a consistent bedtime and wake time for two weeks.
3. Add movement. Start with a short daily walk and build from there.
4. Check alcohol and substances. Track how much you use and whether it is tied to mood or stress.
5. Strengthen one connection. Schedule a regular call or visit with someone you trust.
6. Address one practical stressor. Pick one money, housing or work problem and find one resource for it.
7. Get a checkup. Ask a provider to review physical health and medicines that may affect mood.

What should you tell a provider about your risk factors?

You should tell a provider about your symptoms, family history, life events, health conditions and habits. A short checklist helps:

• "These symptoms started around ___ and have lasted ___."
• "My family history includes ___ (depression, anxiety, bipolar disorder, substance use)."
• "Recent changes or losses include ___."
• "I have these health conditions and take these medicines: ___."
• "I sleep about ___ hours and drink about ___ drinks a week."
• "The people I can count on are ___."

Our guide on what happens at a first psychiatry appointment explains how this information is used.

When should you get help sooner?

You should get help sooner when distressing symptoms last two weeks or longer or interfere with work, school or relationships. The National Institute of Mental Health (NIMH) suggests seeing a health care provider if symptoms last two weeks or longer.

Get help right away for:

• thoughts of suicide or self-harm
• hearing or seeing things others do not
• using more alcohol or drugs to cope
• being unable to care for yourself or your family

Call or text 988 for immediate support, or call 911 if there is immediate danger. Our article on what to do in a mental health crisis explains more options.

What should Texans know about mental health support?

Texans can find mental health support through primary care, community mental health centers, school and university counseling, and private practices. Our guide to free and low-cost mental health care in Dallas–Fort Worth lists local starting points.

Telehealth can widen options for people far from a clinic. Telehealth rules depend on where the patient is located during the visit and vary by state; in general, you need to be physically in Texas to see a Texas-based clinician by video.

Getting support in Texas

Lyte Psychiatry offers therapy, psychiatric evaluation and medication management in Texas. 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. All Lyte Psychiatry services are available in Spanish.

Most new patients are seen within 1–2 business days. Weekend appointments are limited. Lyte Psychiatry is an outpatient practice and does not provide crisis or after-hours coverage. Availability, insurance and clinician fit require confirmation. Learn more about therapy and psychiatry.

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.