Human Brain and Nervous System

Stories, signs to notice and what to do

The Alarm That Would Not Switch Off

Priya was seventeen and preparing for her board exams in Jaipur. Whenever she opened her Physics paper, her heart hammered, her palms turned cold and wet, her mouth went dry and her mind blanked. In the exam hall last term she had sat staring at the first question, sure that she had forgotten everything.

Her older cousin Karan, a medical student, explained it over chai. 'Your body is not broken. It is working too hard. Deep in the brain, an alarm system called the sympathetic nervous system prepares you for danger. It speeds up the heart and sends blood to the muscles. That is useful if a dog is chasing you, but not when you are solving a numerical.' He told her that the body has another system, the parasympathetic, which slows the heart and calms digestion. It takes over when we feel safe.

He taught her a simple routine. Before studying, she sat still, breathed in for four counts, and out slowly for six counts, for about three minutes. She walked for ten minutes each evening and kept her phone out of her room at night. She told her teacher about the freezing, and the teacher allowed short practice tests with no marks so Priya could get used to the paper in a calmer way.

The alarm did not vanish overnight. But in the next exam Priya noticed her heart racing, whispered to herself, 'This is my body trying to help,' slowed her breathing, and wrote the first answer. She finished the paper with ten minutes to spare.

How to recognise it

• Racing heart, sweaty palms, shaking, dry mouth and a blank mind when facing a particular trigger such as exams.
• Worry that starts well before the event and does not fade afterwards.
• Avoiding the situation or freezing in it.
• Muscle tension, headaches or stomach upset linked to stress.
• Pattern repeating over weeks and affecting study or sleep.

What this story explains

This story shows the autonomic nervous system, with the fight-or-flight (sympathetic) and rest-and-digest (parasympathetic) branches. It illustrates that slow breathing and routine help the calming branch, and that the brain can learn new responses.

Probable root causes

• Strong fear of failure that keeps the body's alarm switched on.
• Overactive stress response; the brain's emotional centre reacts before the thinking brain has caught up.
• Lack of sleep and long hours of study that wear down coping.
• Family or social pressure to achieve high marks.
• Past experience of freezing, which builds anticipation of it happening again.

What to do

1. Explain the body's stress response in simple words so the person is less frightened by the sensations.
2. Practise slow breathing with longer out-breaths, daily and not only in crisis.
3. Add movement, regular sleep and meals to the routine.
4. Use low-pressure practice tests to build familiarity.
5. Speak with a teacher or school counsellor about support during exams.
6. Seek professional help if symptoms are strong or last for several weeks.

Whom to consult

• School counsellor for exam anxiety and study planning.
• Family doctor to rule out physical causes and talk about symptoms.
• Clinical psychologist for talking therapy if worry or panic is frequent or severe.
• Psychiatrist if anxiety is very intense, long-lasting or comes with low mood and sleep problems.

Do and don’t

How to behave and communicate

• Use a steady, slow voice; your calm helps theirs.
• Try 'I can see your body is working very hard. Let us take a few slow breaths together.'
• Listen to fears without argument or fixing.
• Avoid threats about the future or jokes about nerves.
• Ask, 'What would make the next exam feel a little easier?'

After the Bike Fall

Arjun, twenty-two, rode his motorbike to a call centre in Hyderabad. One rainy night he skidded and hit his head. He had no helmet on. He was unconscious for a few minutes, spent two days in hospital, and was told that scans looked 'mostly fine' and that he could go home.

Over the next weeks his family noticed changes. Arjun, who had always been careful, now made rash decisions and spent his salary in a day. He lost his temper over small things, shouted at his mother, and then did not seem to understand why people were upset. He could not plan his shift, forgot appointments and often could not find the right word. He also complained of headaches and told them he felt 'not like myself'.

His mother Shanta first thought he was being lazy or rebellious. His sister, who had read about the brain, said, 'The front part of the brain handles planning, self-control and judgement. If that was hurt, he may not be doing this on purpose.' They went back to the hospital and asked for a neurologist.

The neurologist examined Arjun and arranged tests, then explained that changes in behaviour after a head injury are real and need proper follow-up. A neuropsychologist assessed his memory and planning, and Arjun began rehabilitation with simple routines, written reminders and slower days. The family also agreed that from now on he would always wear a helmet. His improvement was gradual, but understanding turned the household from anger to patience.

How to recognise it

• New changes in personality, such as impulsiveness, anger or poor judgement, after a blow to the head.
• Trouble planning, remembering or finding words.
• Headaches, dizziness or tiredness that continue after the injury.
• The person seems unaware of changes or cannot explain them.
• Changes that last or get worse rather than settling in days.

What this story explains

This story shows how the frontal lobe helps with planning, decision-making and self-control, and how injury to the brain can change behaviour. It also stresses brain protection, such as wearing helmets and seat belts.

Probable root causes

• Injury to the frontal and other regions of the brain during the fall.
• Swelling or bruising that can affect brain function for weeks.
• Poor sleep, pain and stress that make symptoms worse.
• Emotional reaction to the accident and to changes in abilities.
• No helmet, which allowed a more serious injury.

What to do

1. Seek medical review after any head injury, and again if new behaviour changes appear.
2. Ask for referral to a neurologist and, if needed, a neuropsychologist who tests thinking and memory.
3. Use written reminders, lists and a steady daily routine to reduce strain.
4. Make sure the person sleeps well, avoids alcohol and returns to activity gradually.
5. Educate the family so that behaviour is understood as part of the injury and not wilfulness.
6. Always wear helmets and seat belts in the future.

Whom to consult

• Neurologist for assessment of brain injury and ongoing symptoms.
• Neuropsychologist or rehabilitation team for memory, planning and behaviour changes.
• Family doctor for follow-up and coordination of care.
• Psychiatrist or clinical psychologist if mood, anger or anxiety become strong after the injury.

Do and don’t

How to behave and communicate

• Speak slowly and clearly, with one instruction at a time.
• Try 'I know this is hard. We will work out a plan together.'
• Stay calm during angry outbursts and talk when things settle.
• Avoid sarcasm and blame.
• Offer written notes and gentle reminders rather than repeating criticism.

Learning to Paint at Seventy

Haridas, seventy-one, retired from the railways in Kolkata and found the days strangely empty. He began forgetting where he had put his glasses and worried that his mind was going. 'The brain is like an old rope,' he told his grandson Ishaan. 'Once it frays, that is it.'

Ishaan, who had just learned about the brain at school, disagreed. He explained that the brain is not fixed. 'Sir says it is plastic. It forms new connections when we learn new things, even when we are old.' Haridas laughed but agreed to a challenge. Together they joined a community art class on Saturday mornings. Haridas, who had not held a brush for fifty years, produced a wobbly mango on his first day.

He kept going. He also began to walk every morning, ate regular meals, and gave up the evening drinks that left him foggy. His daughter insisted he sleep by ten o'clock. She also took him to the family doctor, who checked his blood pressure, eyesight and hearing, and talked to him about memory. The doctor said that occasional forgetfulness is common with age, especially with poor sleep and low activity, but that worsening confusion, getting lost in familiar places or difficulty with daily tasks deserve a proper check by a specialist.

By the end of the year Haridas's mango had become a market scene. His memory still slipped now and then, but he felt sharper and more purposeful, and the family felt calmer because there was a plan.

How to recognise it

• Occasional misplacing of things and worry about memory.
• Reduced activity, poor sleep or alcohol that can cloud thinking.
• Fear that the brain cannot change or improve with age.
• Warning signs needing specialist review: getting lost in familiar places, repeated questions, trouble with daily tasks, personality change.
• Whether problems are slowly worsening over months.

What this story explains

This story shows brain plasticity: the brain can form new connections and learn at any age. It also shows ordinary brain-care habits: sleep, activity, limiting alcohol and keeping mentally and socially active.

Probable root causes

• Loss of daily structure after retirement.
• Poor sleep, low activity and alcohol that affect memory and attention.
• Untreated issues such as high blood pressure, poor hearing or poor eyesight.
• Low mood or loneliness that can look like memory trouble.
• Natural, mild changes with age, and occasionally early memory disease.

What to do

1. Learn something new that you enjoy, such as art, music, a language or a craft.
2. Move daily, even by walking, and keep regular sleep hours.
3. Limit alcohol and keep other health problems, like blood pressure, checked.
4. Stay socially connected with family, friends and community.
5. Use notes, calendars and fixed places for essentials.
6. See a doctor if forgetfulness starts to interfere with daily life.

Whom to consult

• Family doctor for a general check, including blood pressure, eyesight, hearing and mood.
• Neurologist or geriatric specialist if memory problems are worsening or affect daily tasks.
• Clinical psychologist or counsellor if low mood, loneliness or worry is present.
• Occupational therapist for practical routines to support independence.

Do and don’t

How to behave and communicate

• Speak respectfully and never treat an elder like a child.
• Try 'Let us do this together on Saturday. I would enjoy learning with you.'
• Be patient with repeated questions and answer calmly.
• Avoid correcting every small slip in front of others.
• Encourage with specific praise: 'Your painting has really improved.'

Midnight Scrolling and the Growing Brain

Fifteen-year-old Chloe lived in Manchester and was known at school for her sharp wit. Lately she had been dozing in class and saying things she regretted. Last week she sent a cruel message to a friend after a small argument, then spent the night in tears. 'I do not know why I did it,' she told her father, Mark.

Mark had a habit of lecturing, but this time he stopped and asked what her evenings looked like. Chloe admitted she usually scrolled until 2 a.m. and often skipped breakfast. Mark remembered an article he had read. The front part of the brain, which helps with self-control, judgement and thinking ahead, keeps developing until the mid-twenties. The emotional centres, deeper in the brain, are very active in the teen years. Add tiredness, and the emotional centres tend to win.

They made a plan together. The phone would charge in the hall at night. She would aim for a regular bedtime, eat breakfast, and keep one hour of daily movement, which she chose to be dance. When a strong feeling came up, she would wait ten minutes before replying to a message. Mark also asked her school counsellor to speak with her about managing arguments with friends.

The first weeks were hard. But Chloe slept better and found that giving feelings a short pause kept her from many regrets. She apologised to her friend. Mark learned to ask 'what is your evening like?' before 'what is wrong with you?'

How to recognise it

• Sudden strong emotional reactions or impulsive actions followed by regret.
• Late nights, tiredness in the day and skipped meals.
• Mood that is changeable but recovers when rested.
• Heavy phone use at night and strong reactions to social events.
• Signs that need professional help: low mood or anxiety lasting weeks, or very risky behaviour.

What this story explains

This story shows how the frontal lobe, responsible for self-control, is still developing in teenagers while the limbic (emotional) system is highly active. It illustrates how sleep, routine and alcohol-free, drug-free habits protect the brain.

Probable root causes

• Brain development in the teen years, with emotional centres more active than self-control areas.
• Too little sleep, which weakens self-control.
• Irregular meals and low movement.
• Social pressure and fast-moving online conflicts.
• Stress that adolescents may not yet have words for.

What to do

1. Talk calmly about how the teen brain develops, so the teen does not feel judged.
2. Agree on a phone-free wind-down and regular sleep times.
3. Encourage regular meals and daily movement.
4. Teach a pause rule: wait ten minutes before replying when upset.
5. Help the teen to repair damage by apologising and learning from it.
6. Involve the school counsellor or doctor if mood problems continue.

Whom to consult

• School counsellor for friendship conflicts and emotion management.
• Paediatrician or family doctor for sleep, mood and physical health checks.
• Clinical psychologist if anger, low mood or anxiety are frequent and harmful.
• Psychiatrist if risky behaviour, severe mood swings or any self-harm thoughts appear; for danger, use the emergency number or nearest hospital.

Do and don’t

How to behave and communicate

• Pick a calm moment and start with curiosity: 'Tell me about your evenings.'
• Say 'I think your brain is still wiring up self-control; let us build some helpful habits together.'
• Listen fully before giving advice.
• Avoid shaming or sarcasm.
• Show you are on their side while still holding clear limits.

This book is for education and general awareness. It does not replace diagnosis or treatment by a qualified professional. If anyone is in danger, contact your local emergency services.