Mood Disorders: Types, Symptoms, Causes, Diagnosis and Treatment

Mood changes happen to everyone. But when low mood, emptiness, irritability or unusually high energy becomes persistent, intense or disruptive, you may be dealing with more than a difficult phase. Mood disorders can affect relationships, work, studies, sleep and your ability to cope. The right assessment can help you understand what is happening and what treatment may help.

What Are Mood Disorders?

Mood disorders are mental health conditions that cause significant, ongoing changes in mood, energy, thinking and daily functioning. They include depressive disorders and bipolar-related disorders.

Ms Sulagna Mondal, Clinical psychologist at BetterPlace Health, explains that people often dismiss early symptoms as personality traits. Withdrawal, anger outbursts, impulsivity, feeling empty, anxiety and fear can overlap with depression, anxiety disorders and personality-related difficulties. You may think, “This is just how I am,” or blame circumstances entirely, even when symptoms make it harder to respond to them.

Many people seek help only once symptoms visibly affect work, relationships or studies. According to Ms Mondal, you may underestimate their effect for a long time, hoping life will improve first. Ask yourself: “Has this changed how I live, connect, work or care for myself?”

Are Mood Swings a Disorder?

Not necessarily. Stress, grief, poor sleep, hormonal changes, alcohol and life circumstances can cause temporary mood shifts. A clinician considers a mood disorder when moods become recurrent or persistent, unusually intense and disruptive to daily life.

Types of Mood Disorders

Depressive Disorders
Depressive disorders involve persistent low mood, loss of interest and other symptoms that affect functioning.

Major Depressive Disorder
Major depression involves a sustained period of low mood or loss of interest, often with changes in sleep, appetite, energy, concentration, guilt or hopelessness.

Persistent Depressive Disorder
This is a long-lasting form of depression. Symptoms may feel less severe than a major depressive episode but can continue for years and affect confidence, relationships and motivation.

Depression With Seasonal Pattern
Some people experience depressive episodes during a particular season, often when daylight hours reduce. Reduced light may affect your body clock and sleep-wake patterns. It may also influence brain chemicals involved in mood, although no single cause explains every case. You may notice fatigue, low mood, sleeping longer, appetite changes and loss of motivation.

Perinatal Depression
Perinatal depression can happen during pregnancy or after childbirth. Guilt and shame often delay help-seeking. Ms Mondal notes that some parents struggle to accept distressing feelings because they believe they “should” feel only happy or grateful. Feeling low, anxious or disconnected does not make you a bad parent. It means you deserve support.

Premenstrual Dysphoric Disorder
PMDD causes severe mood symptoms before periods, such as irritability, depression, anxiety or emotional sensitivity. Symptoms can disrupt life, then improve after menstruation begins. Tracking symptoms across menstrual cycles helps clinicians distinguish PMDD from other conditions.

Bipolar and Related Disorders

Bipolar disorders involve episodes of depression and periods of mania or hypomania.

Bipolar I Disorder
Bipolar I involves manic episodes. During mania, you may sleep very little, feel unusually energised or irritable, speak rapidly, have racing thoughts and make impulsive decisions. As Ms Mondal highlights, escalating mania can lead to excessive spending, gambling, substance use, risky decisions, strained relationships, paranoia, self-harm or risk to others.

Bipolar II Disorder
Bipolar II involves hypomanic and depressive episodes. Hypomania can affect judgement and functioning even though it is less severe than full mania.

Cyclothymic Disorder
Cyclothymic disorder involves ongoing fluctuations between milder depressive and hypomanic symptoms over a long period. The pattern can feel unpredictable and exhausting.

Mood Disorder Due to Another Medical Condition

Physical health can influence mood. Thyroid conditions, anaemia, vitamin B12 deficiency, hormonal changes and serious medical illness can cause or worsen mood symptoms. Chronic pain and sexual health concerns can further affect mood. A medical assessment helps identify treatable contributors.

Mood Disorders Symptoms

Signs of Depression
You may feel persistently low, empty, hopeless, guilty or irritable. You may lose interest in things you enjoy, have sleep or appetite changes, feel fatigued or struggle to concentrate.

Signs of Mania or Hypomania
You may feel unusually energetic, confident or irritable, need less sleep, speak faster, have racing thoughts, become easily distracted or take risks that are out of character.

Signs Families May Notice
Loved ones may notice withdrawal, major sleep changes, unexplained anger, loss of interest, reduced self-care, falling performance, rapid speech, risky spending or sudden routine changes.

Causes of Mood Disorders

Mood disorders usually result from a combination of factors. Genetics and family history can increase vulnerability, but they do not determine your future. Stress, trauma, relationship difficulties, sleep disruption and major life changes can also contribute.

Alcohol and other substances can trigger, worsen or mask mood symptoms. Some people use substances to cope with distress, but withdrawal can temporarily intensify low mood, anxiety or irritability. Symptoms may continue after use stops, so professional assessment remains important.

Mood Disorder Diagnosis

At BetterPlace, assessment can begin with a detailed 90-minute intake session. The team explores your concerns, symptom timeline, medical and family history, substance use, sleep, relationships, work or studies and possible co-occurring conditions.

Ms Mondal explains that when symptoms do not clearly point to one condition, the team may recommend detailed assessments. These can include mood, personality and other clinical tools to understand the full picture. A psychiatrist may also advise relevant physical tests to rule out medical contributors.

Mood Disorders Treatment

Medication
A psychiatrist may recommend medication when symptoms are moderate, severe, recurrent or part of bipolar disorder. The choice depends on your diagnosis, history, physical health and treatment response. Do not start, change or stop psychiatric medication without medical guidance.

Therapy
Therapy can help you understand mood patterns, build coping skills, improve relationships, manage stress and recognise early warning signs.

Lifestyle and Recovery Support
Small, realistic changes matter. Ms Mondal encourages you to begin with an achievable routine: regular sleep, meals, movement, simple daily tasks and gradual re-engagement with people and responsibilities. The aim is not to fix everything in a week. It is to build consistency that supports recovery.

Brain Stimulation and Advanced Treatment Options
For severe or treatment-resistant depression, a psychiatrist may discuss options such as rTMS or electroconvulsive therapy. These treatments need specialist assessment and monitoring.

When to See a Mental Health Professional

Seek help when your mood, energy, sleep, behaviour or ability to function has changed for two weeks or more, or when symptoms become intense and recurrent. Seek urgent support if you have thoughts of suicide or self-harm, feel out of control during a high mood, or cannot keep yourself safe.