Brain
Encephalon · Mozek
Nervous system
Looks like
A wrinkled 1.3 kg organ the texture of firm jelly, floating in fluid inside the skull.
What it does
Runs everything: movement, senses, memory, speech, mood and breathing.
Keeping it well
Sleep, exercise, blood-pressure control, hearing aids if needed and company. A face drooping, arm weakness or speech trouble means call an ambulance.
Its parts
Related conditions
- Absent periods (amenorrhoea)
- Acromegaly
- Acute liver failure
- ADHD
- Adjustment disorder
- Adrenal insufficiency (Addison's)
- African trypanosomiasis (sleeping sickness)
- Alcohol withdrawal and delirium tremens
- Altitude sickness
- Alzheimer's disease
- Amyloidosis (AL and ATTR)
- Amyotrophic lateral sclerosis
- Autism spectrum disorder
- Bedwetting (nocturnal enuresis)
- Bipolar disorder
- Birth asphyxia (hypoxic-ischaemic encephalopathy)
- Body dysmorphic disorder
- Bone metastases and spinal cord compression
- Borderline personality disorder
- Botulism
- Brain abscess
- Brain aneurysm
- Brain tumour (glioma & meningioma)
- Burnout
- Cerebral palsy
- Chiari malformation and syringomyelia
- Chickenpox (varicella)
- Chronic insomnia
- Chronic neuropathic pain
- Chronic pain syndrome
- Cluster headache
- Concussion (mild TBI)
- Conduct disorder
- Congenital hypothyroidism
- Cryptococcal meningitis
- Cushing's syndrome
- Delirium
- Dementia with Lewy bodies
- Diabetes insipidus (arginine vasopressin deficiency)
- Dissociative disorders
- Down syndrome (trisomy 21)
- Drowning
- Dyslexia
- Early puberty (precocious puberty)
- Eating disorders
- Encephalitis
- Epilepsy
- Essential tremor & dystonia
- Fainting (syncope)
- Febrile seizures
- Fibromyalgia
- Fragile X syndrome
- Frailty & falls in older age
- Friedreich's ataxia
- Frontotemporal dementia
- Functional (somatic) symptom disorder
- Gambling disorder
- Generalised anxiety disorder
- Guillain-Barré syndrome
- Haemorrhagic stroke
- Heat exhaustion & heatstroke
- Hepatic encephalopathy
- High blood pressure
- High cholesterol
- High prolactin (hyperprolactinaemia)
- Huntington's disease
- Hydrocephalus
- Hyperthyroidism & Graves' disease
- Hypoglycaemia (low blood sugar)
- Hypopituitarism
- Hypothermia & frostbite
- Hypothyroidism
- Idiopathic intracranial hypertension
- Intellectual disability
- Ischaemic stroke
- Japanese encephalitis
- Jet lag
- Kawasaki disease
- Lead poisoning
- Long COVID (post-viral syndrome)
- Lyme disease
- Major depressive disorder
- Male hypogonadism
- ME/chronic fatigue syndrome
- Measles
- Medication-overuse headache
- Meningitis
- Menopause & perimenopause
- Metabolic syndrome
- Migraine
- Multiple sclerosis
- Mumps
- Myasthenia gravis
- Narcolepsy
- Neonatal sepsis
- Neurocysticercosis
- Normal pressure hydrocephalus
- Obsessive-compulsive disorder
- Orthostatic hypotension & POTS
- Panic disorder
- Parkinson's disease
- Peripheral artery disease
- Peripheral neuropathy
- Phaeochromocytoma & hyperaldosteronism
- Phenylketonuria (PKU)
- Pituitary adenoma
- Poisoning & overdose
- Polycystic ovary syndrome
- Post-traumatic stress disorder
- Postnatal depression
- Postpartum psychosis
- Pre-eclampsia
- Premenstrual syndrome and PMDD
- Rabies
- Raynaud's phenomenon
- Restless legs syndrome
- Roseola (sixth disease)
- Schizophrenia
- Seasonal affective disorder
- Self-harm and suicidal crisis
- Sepsis
- Shingles (herpes zoster)
- Shock (circulatory failure)
- SIADH (inappropriate antidiuretic hormone)
- Social anxiety disorder
- Specific phobia
- Spina bifida & neural tube defects
- Squint & lazy eye
- Subdural haematoma
- Substance use disorder
- Sudden infant death syndrome
- Tension-type headache
- Tetanus
- Thrombotic thrombocytopenic purpura (TTP)
- Tick-borne encephalitis
- Tics and Tourette syndrome
- Tinnitus
- Toxoplasmosis & CMV
- Transient ischaemic attack
- Traumatic brain injury (moderate to severe)
- Trigeminal neuralgia
- Tuberous sclerosis complex
- Type 1 diabetes
- Vascular dementia
- Vasculitis (GCA & others)
- Vestibular schwannoma (acoustic neuroma)
- Vitamin B1, C and other deficiencies