Understanding Depression: Symptoms, Types and Treatment

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.

Understanding depression starts with knowing it is a common, treatable medical condition, not a personal weakness. Depression affects mood, thinking, sleep, energy and the body, usually for most of the day, nearly every day, for at least two weeks. Psychotherapy, medication or both help many people, and compassion from others makes it easier to seek and stay in care.

This guide is for anyone who thinks they may be depressed, and for family and friends who want to understand and help. It covers symptoms, common types, causes, treatment and what to say. This article is general information, not a medical recommendation. Do not start, stop or change any medication without talking to your prescriber.

What is depression?

Depression is a mood disorder that causes persistent feelings of sadness, emptiness or loss of interest, along with other symptoms that affect how you feel, think and handle daily activities. It is different from ordinary sadness, which usually passes as circumstances change.

The National Institute of Mental Health (NIMH) explains in its depression overview that symptoms must be present most of the day, nearly every day, for at least two weeks for a diagnosis. The American Psychiatric Association (APA) describes depression as feeling sad, irritable, empty or hopeless, with changes that affect functioning.

What are the symptoms of depression?

Symptoms of depression include emotional, physical and thinking changes. The NIMH lists signs such as:

• Persistent sad, anxious or "empty" mood
• Loss of interest or pleasure in activities
• Feelings of hopelessness, guilt or worthlessness
• Fatigue or decreased energy
• Trouble concentrating, remembering or making decisions
• Sleeping too much or too little, and appetite or weight changes
• Aches, pains or digestive problems without a clear physical cause
• Thoughts of death or suicide

Depression can look different from person to person. MedlinePlus notes that men may appear angry or irritable rather than sad. Our article on signs of depression people often ignore and when depression looks like anger cover less obvious signs.

What are the main types of depression?

Depression has several forms that differ in timing, triggers and pattern. Knowing the type helps a clinician recommend the right treatment.

• Major depression: symptoms most of the day, nearly every day, for at least two weeks.
• Persistent depressive disorder: less severe symptoms that last much longer, usually for at least two years.
• Seasonal affective disorder (SAD): depression that follows a seasonal pattern.
• Perinatal depression: depression during pregnancy or after birth.

The NIMH describes seasonal affective disorder as a recurrent pattern that typically lasts four to five months of the year. The NIMH also explains that perinatal depression is more severe and longer lasting than the "baby blues." Depression can also be part of bipolar disorder, which needs different care; see bipolar 2 vs. depression.

What causes depression?

Depression usually comes from a mix of factors rather than one cause. The NIMH says research suggests genetic, biological, environmental and psychological factors play a role, and that depression can occur alongside conditions such as diabetes, cancer, heart disease and chronic pain. Anyone can develop depression, including people whose lives look fine from the outside.

MedlinePlus notes that certain medicines and medical conditions, such as viruses and thyroid disorders, can cause symptoms that look like depression. That is one reason a medical checkup is part of a good evaluation.

Example: a hypothetical adult who has felt flat and exhausted for a month after a stressful move may have depression, a thyroid problem, or both, and only an evaluation can tell.

How is depression treated?

Depression is most often treated with psychotherapy, medication or a combination of both. The NIMH notes that finding the best treatment may take some trial and error, and that all medications can have side effects.

The NIMH names cognitive behavioral therapy (CBT), which helps people challenge and change unhelpful thoughts and behaviors, and interpersonal therapy (IPT), which focuses on communication in relationships, among evidence-based therapies. MedlinePlus explains that antidepressants may take four to eight weeks to work, and advises never stopping them on your own. Your prescriber can explain the benefits and risks of any medication.

If two different treatments have not helped, our article on treatment-resistant depression explains further options.

What daily habits support recovery?

Daily habits do not replace treatment, but they can support recovery and make other care work better. Small, steady steps matter more than big changes.

1. Keep the same wake time every day, even after a poor night.
2. Get outside or near a window in the morning.
3. Move your body for a few minutes, then build up.
4. Eat regular meals, even small ones.
5. Plan one small, enjoyable or meaningful activity each day.
6. Stay in touch with at least one supportive person.
7. Limit alcohol, which can worsen mood and sleep.

MedlinePlus notes that exercise can reduce feelings of stress and depression and improve mood. If mornings are hardest, see why depression makes mornings the hardest.

What should you say to someone with depression?

The most helpful things to say are simple, warm and non-judgmental, and they focus on listening rather than fixing. Compassion makes it easier for someone to accept help.

• "I am here for you, and I am not going anywhere."
• "You do not have to explain. Do you want company?"
• "Would it help if I sat with you while you made the call to book an appointment?"
• "Are you having thoughts of hurting yourself?"

Avoid "Snap out of it," "Others have it worse," or "Just think positive." Offer practical help, such as a ride to an appointment or a meal.

How can family and friends help over time?

Family and friends help most by staying patient and present over weeks and months, because recovery from depression is usually gradual. The NIMH encourages loved ones to offer support, understanding, patience and encouragement, and to remind the person that with time and treatment, depression can lift.

• Offer rides to appointments or help finding a clinician.
• Check in regularly with a short text, not only during crises.
• Invite them to low-pressure activities, and accept a "no" without guilt.
• Help with reminders for appointments or treatment plans if they want that.
• Look after your own rest and support, too.

Understanding depression as an illness, not a choice, helps loved ones avoid blame and stay connected.

Step by step: how to get evaluated for depression

Getting evaluated is the most direct way to find out whether depression is the cause of how you feel. These steps can help you prepare:

1. Write down your symptoms, when they started, and how they affect work, sleep and relationships.
2. List medications, supplements, alcohol use and any medical conditions.
3. Book a visit with a primary care provider, therapist or psychiatric clinician.
4. Ask whether a medical checkup or lab tests make sense to rule out other causes.
5. Ask about therapy, medication or both, and what each involves.
6. Agree on a follow-up date to check progress.

When should you get help sooner?

Get help right away if you or someone you know has thoughts of suicide, talks about being a burden, or is giving away belongings. The NIMH lists these and other warning signs of suicide, including withdrawing from others, extreme mood swings and increased alcohol or drug use.

• Call or text 988 for the Suicide & Crisis Lifeline.
• Call 911 for immediate danger.
• Do not leave a person at risk alone, and remove access to means of harm.

If a screening questionnaire has already flagged depression, see positive depression screen: what next.

What should Texans know about depression care?

Texans can still develop seasonal depression, even though the NIMH notes that SAD is more common in northern states such as Alaska and New England than in southern states like Texas and Florida. Shorter days can affect mood anywhere.

Local mental health authorities across Texas run 24/7 crisis lines, and 2-1-1 Texas can connect people with community services.

Texas is a large state, and travel time can be a barrier to care. Telehealth can help, as long as you are physically located in Texas at the time of each visit with a Texas-based practice. Ask any practice how it handles visits if you travel out of state.

Getting support in Texas

Understanding depression is the first step; getting an evaluation is the next. 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.

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. Read about depression care and medication management, and contact the practice to confirm fit.

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.

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.