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Mental Disorders
Mental health conditions such as depression, anxiety disorders, and addiction are not illnesses that affect only a special few; they are common conditions that can happen to anyone. Emotional difficulties may appear in many forms, including depressed mood, anxiety, insomnia, interpersonal problems, and a persistent sense of struggling in daily life. These conditions are often influenced by a combination of factors, such as brain function, personality traits, life circumstances, and stress.
On this page, we introduce selected papers and articles written by the clinic director on various mental health conditions. Rather than viewing illness merely as a collection of symptoms, we aim to understand each person within the context of their background and way of life, while providing clear and accessible explanations from the perspective of psychiatry.
Mood Disorders
Mood disorders are a general term for psychiatric conditions characterized by persistent changes in mood, such as depression or elevated mood. Typical examples include depressive disorder and bipolar disorder, often accompanied by a variety of symptoms such as decreased motivation, insomnia, fatigue, and impaired concentration. In recent years, the interaction between brain function, lifestyle rhythms, and stress is thought to play a role in both onset and recurrence.

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Anxiety Disorders
Anxiety disorders are a general term for psychiatric conditions in which excessive anxiety or fear persists and interferes with daily life. They include generalized anxiety disorder, social anxiety disorder, and panic disorder, often accompanied by physical symptoms such as palpitations, shortness of breath, dizziness, and insomnia. Recent research has focused on stress responses, neurotransmitter function, and autonomic nervous system involvement.

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Obsessive-Compulsive and Related Disorders
Obsessive-compulsive and related disorders are psychiatric conditions characterized by intrusive, irrational thoughts (obsessions) and repetitive behaviors (compulsions) performed to neutralize them. These include checking behaviors, excessive cleaning, hoarding disorder, and trichotillomania. Recent studies have focused on abnormalities in anxiety regulation systems and neural circuits.
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Trauma- and Stressor-Related Disorders
Trauma- and stressor-related disorders are psychiatric conditions triggered by highly frightening or psychologically overwhelming events. Typical examples include post-traumatic stress disorder (PTSD) and adjustment disorder, with symptoms such as flashbacks, insomnia, hyperarousal, and emotional instability. Recent research has focused on stress responses and memory processing mechanisms.
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Schizophrenia Spectrum Disorders
Schizophrenia spectrum disorders are a group of conditions that impair reality perception, thought processes, and emotional expression. Symptoms include hallucinations, delusions, reduced motivation, and difficulties in interpersonal relationships. The onset is thought to involve genetic factors, stress, and changes in brain function. Early detection and continuous treatment support are considered essential.
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Neurodevelopmental Disorders
Neurodevelopmental disorders are a group of conditions in which cognitive, behavioral, and communication functions show atypical development. They include attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder (ASD), and learning disorders. These traits often appear in early childhood, and recent research has focused on brain development and sensory processing differences.
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Substance-Related and Addictive Disorders
Substance-related and addictive disorders involve loss of control over the use of substances such as alcohol or drugs, or behaviors such as gambling. Individuals may continue these behaviors despite wanting to stop, significantly affecting daily life and interpersonal relationships. Recent research has clarified involvement of the brain’s reward system and impulse control mechanisms.

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Sleep Disorders Associated with Mental Illness
Sleep disorders associated with mental illness refer to abnormalities in the quantity or quality of sleep occurring in conditions such as depression, bipolar disorder, and anxiety disorders. Sleep disturbances can worsen psychiatric symptoms and play an important role in psychiatric evaluation and treatment strategies.

Neurocognitive Disorders
Neurocognitive disorders are conditions characterized by decline in cognitive functions such as memory, attention, and judgment, with dementia being the most common example. They often interfere with daily life and may be caused not only by aging but also by cerebrovascular disease or neurodegenerative disorders. Early diagnosis, lifestyle support, and environmental adjustments are essential.
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Related Neurological Disorders
Neurological disorders are conditions affecting the nervous system, including the brain, spinal cord, and peripheral nerves. Symptoms vary widely, including headache, numbness, seizures, movement disorders, and cognitive decline. Conditions include stroke, epilepsy, and Parkinson’s disease. Advances in imaging and regenerative medicine have contributed to progress in diagnosis and treatment.
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Personality and Interpersonal Relationships
Problems in personality and interpersonal relationships refer to difficulties in social life and human relationships caused by patterns of thinking, emotion, or behavior. These may include social anxiety, difficulties in emotion regulation, and strong dependency tendencies. Multiple factors such as developmental environment, temperament, and stress experiences are thought to contribute.
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Mental health difficulties are often invisible to others and can sometimes be hard to put into words, even for the person experiencing them. By exploring and organizing the background of these struggles, it may become possible to understand them in a different way.
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