Why does one person cope well with a difficult situation while another develops anxiety, depression, or another mental health condition?
It is a question many people ask, especially when mental health problems seem to appear without warning.
The truth is that mental illnesses usually do not have one simple cause. They can develop through a combination of biological factors, life experiences, psychological factors, and the environment around us.
For someone living in Saudi Arabia, these factors can include everything from family history and ongoing stress to traumatic experiences, sleep problems, social isolation, or major changes in life.
Understanding the possible causes of mental illnesses does not mean blaming yourself or someone else. In many cases, identifying contributing factors can simply help a person understand what they are experiencing and know when it may be time to seek professional support.
What Causes Mental Illness?
Mental illnesses can develop when several risk factors come together. Some people may have a higher biological vulnerability to certain conditions, while stressful experiences or environmental factors can contribute to symptoms.
The five major factors commonly associated with mental illness are:
• Genetics and family history
• Brain chemistry and biological factors
• Trauma and difficult life experiences
• Chronic stress and environmental factors
• Lifestyle, physical health, and substance use
Let's look at each one in more detail.
Genetics and Family History
Our genes can influence how vulnerable we are to certain mental health conditions.
For example, having a close family member with depression, bipolar disorder, schizophrenia, or certain anxiety disorders may increase a person's risk of developing a similar condition.
However, having a family history does not mean that you will definitely develop a mental illness.
Think of genetics as one piece of the puzzle rather than a predetermined outcome.
Mental health conditions are generally influenced by many genes, along with a person's experiences and environment. This is one reason why two people from the same family can have very different mental health experiences.
If mental illness runs in your family, it does not mean there is something "wrong" with you. It simply means that being aware of your mental health may be particularly important.
Brain Chemistry and Other Biological Factors
The brain is closely connected to our emotions, thoughts, behaviour, sleep, and ability to handle stress.
Changes or differences in brain function and biological processes may play a role in some mental health conditions.
Hormonal changes, certain medical conditions, inflammation, genetics, and other biological factors can also influence mental wellbeing.
For example, some physical health conditions can cause symptoms that look similar to psychological problems. This is one reason healthcare professionals may ask about both your physical and mental health when assessing symptoms.
It is also important to be cautious about the popular idea that mental illness is simply caused by having "low serotonin" or another chemical imbalance.
Mental health is much more complicated than one chemical in the brain. Scientists continue to study the complex interaction between genetics, brain function, environment, and experience.
Trauma and Difficult Life Experiences
Sometimes life leaves emotional wounds that are not immediately visible.
Experiencing or witnessing a traumatic event can increase the risk of developing mental health problems. Trauma can include serious accidents, violence, abuse, loss, natural disasters, or other frightening experiences.
But trauma does not affect everyone in the same way.
Two people can experience the same event and respond very differently. One person may recover with time and support, while another may develop symptoms of PTSD, anxiety, depression, or another condition.
Difficult experiences do not have to be dramatic to affect mental health, either.
Relationship problems, grief, bullying, loneliness, financial difficulties, academic pressure, or major changes in life can also contribute to emotional distress.
For many people, it is not one event but several difficult experiences building up over time.
Chronic Stress and Environmental Factors
Stress is a normal part of life. A certain amount can even help us respond to challenges.
The problem can arise when stress becomes intense, persistent, or difficult to escape.
Long-term stress may come from:
• Work pressure
• Financial difficulties
• Family responsibilities
• Relationship problems
• Academic pressure
• Workplace conflict
• Social isolation
• Ongoing uncertainty
• Caring for someone who is unwell
• Major life changes
Living in a constantly stressful environment can make it harder for the mind and body to recover.
For people in Saudi Arabia, everyday pressures can look different depending on age, family circumstances, work, education, and community. A university student, a new parent, and someone managing a demanding career may experience completely different sources of stress.
What matters is how persistent stress affects the individual.
Lifestyle, Physical Health, and Substance Use
Our physical and mental health are closely connected.
Poor sleep, lack of physical activity, an unhealthy routine, certain medical conditions, and prolonged exhaustion can affect mood and emotional wellbeing.
For example, consistently getting too little sleep can make it harder to regulate emotions, concentrate, and cope with everyday stress.
Substance use can also contribute to mental health problems. Alcohol and certain drugs can affect brain function and may worsen symptoms such as anxiety, depression, paranoia, or changes in mood.
This does not mean that someone's lifestyle "caused" their mental illness. Mental health conditions are complex, and blaming someone for their condition is rarely helpful.
Instead, lifestyle factors can be viewed as one part of a much larger picture.
Can Social Isolation Cause Mental Illness?
Loneliness and social isolation can have a significant impact on mental wellbeing.
Humans naturally need connection and supportive relationships. When someone becomes isolated from family, friends, colleagues, or their wider community, they may have fewer opportunities to talk about problems or receive emotional support.
Social isolation can also make existing mental health symptoms feel worse.
At the same time, isolation may sometimes be a symptom of mental illness rather than its original cause. Someone experiencing depression, anxiety, or another condition may withdraw from people because social interaction feels exhausting or overwhelming.
This is why mental health is rarely as simple as identifying one cause.
Can Stress Alone Cause Mental Illness?
Stress can contribute to mental health problems, but it is not necessarily the only cause.
A person may already have genetic or biological vulnerabilities, and prolonged stress may then contribute to the development or worsening of symptoms.
This is sometimes described using a biopsychosocial approach, where biological, psychological, and social factors are considered together.
In simple terms: Your mental health is influenced by your body, your mind, your experiences, and the environment around you.
Why Do Some People Develop Mental Illness While Others Don't?
This is one of the most important things to understand.
There is no universal formula for mental illness.
Two people can experience the same stressful event and have completely different outcomes. One might recover quickly, another might struggle for several months, and another might develop a longer-term mental health condition.
Factors such as genetics, previous experiences, coping skills, social support, physical health, sleep, and access to healthcare can all influence how someone responds.
This is why saying someone developed a mental illness because they were "not strong enough" is inaccurate and unfair.
Can Mental Illness Be Prevented?
Not every mental illness can be prevented, and having healthy habits does not guarantee that someone will never develop a mental health condition.
However, several habits can support overall mental wellbeing.
These include:
• Getting regular, adequate sleep
• Staying physically active
• Maintaining supportive relationships
• Learning healthy ways to manage stress
• Seeking help when problems become difficult to manage
• Avoiding harmful substance use
• Maintaining regular medical care
• Taking breaks and making time for enjoyable activities
Early support can also make a difference. You do not need to wait until your symptoms become severe before talking to a healthcare professional.
When Should You Talk to a Mental Health Professional?
Everyone experiences stress, sadness, fear, or difficult emotions from time to time.
It may be worth seeking professional help when symptoms are persistent, becoming more severe, or interfering with everyday life.
Consider talking to a doctor, psychologist, psychiatrist, or another qualified healthcare professional if you are experiencing:
• Persistent sadness or hopelessness
• Excessive or difficult-to-control worry
• Major changes in sleep or appetite
• Loss of interest in activities you normally enjoy
• Difficulty concentrating
• Significant changes in mood or behaviour
• Social withdrawal
• Problems functioning at work, university, or home
• Thoughts of self-harm or suicide
You do not need to know exactly what is causing your mental health symptoms before asking for help.
A professional can help you understand what may be happening and discuss appropriate treatment or support.
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Writer at ACT Center