Neurological and Endocrine Disorders

Why Neurological and Endocrine Disorders Matter for Clinical Practice

When a client walks into your office complaining of depression, memory problems, or sudden personality changes, you might assume these are purely psychological issues. But what if the real culprit is something happening at the biological level, a stroke, a thyroid problem, or a progressive brain disease? Understanding neurological and endocrine disorders isn't just important for the EPPP; it's essential for being a competent psychologist who knows when symptoms point to a medical emergency rather than a mental health concern.

This section covers the brain and hormonal conditions that can mimic or cause psychological symptoms. We'll break down strokes, brain injuries, movement disorders, seizures, and endocrine problems in a way that sticks with you long after exam day.

Strokes: When Blood Flow Gets Cut Off

A cerebrovascular accident (CVA), commonly called a stroke, happens when blood flow to part of the brain suddenly stops. {{M}}Think of it like your internet connection dropping during an important video meeting{{/M}}, when the connection is lost, communication stops, and things stop working properly. In the brain, no blood flow means no oxygen and nutrients, which causes brain cells to die within minutes.

Risk Factors You Need to Know

The number one risk factor is hypertension (high blood pressure). Other major risks include:

• Atherosclerosis (hardened arteries)
• Heart disease and diabetes
• Smoking and heavy drinking
• Being older, male, or African American
• Family history of stroke

Two Main Types of Strokes

Ischemic strokes (the most common type) occur when something blocks an artery:

• Thrombotic stroke: A blood clot forms right in a brain artery
• Embolic stroke: A clot forms elsewhere (like the heart) and travels to the brain

There's also something called a transient ischemic attack (TIA), which is like a warning shot. The blockage clears in less than five minutes, symptoms are temporary, but it's a serious sign that a major stroke could be coming. Always treat TIAs as medical emergencies.

Hemorrhagic strokes happen when an artery ruptures and bleeds:

• Intracerebral hemorrhage: Bleeding inside the brain tissue
• Subarachnoid hemorrhage: Bleeding in the space around the brain

Recognizing Stroke Symptoms by Location

Different arteries cause different symptoms. Here's what you need to remember:

Notice the pattern: symptoms appear on the opposite side of the body from where the stroke occurred. This is because brain pathways cross over.

Traumatic Brain Injury: When the Brain Gets Shaken or Pierced

Traumatic brain injury (TBI) can happen in two ways: open injuries (something penetrates the skull) and closed injuries (the brain bounces around inside the skull). Surprisingly, closed head injuries often cause more widespread damage because the whole brain can be affected by the impact.

What Happens After TBI

After someone regains consciousness from a TBI, they typically experience a mix of problems:

Memory issues are particularly important to understand:

• Anterograde amnesia (also called post-traumatic amnesia): Can't form new memories after the injury. {{M}}It's like trying to save a document when your computer's hard drive is temporarily damaged{{/M}}. New information just won't stick. The length of this amnesia predicts how well someone will recover.
• Retrograde amnesia: Can't remember things from before the injury. Recent memories disappear first, and when memories return, the oldest ones come back first.

Other common symptoms include:

• Physical: headaches, nausea, sleep problems (too much or too little)
• Cognitive: trouble concentrating, slowed thinking
• Emotional: depression, irritability
• Communication: aprosodia (inability to express or understand emotional tone in speech)

Seizures After TBI

Post-traumatic seizures (PTS) occur within the first week and usually respond well to medication. Post-traumatic epilepsy (PTE) starts after one week and is harder to treat. When medications don't work, doctors might try vagus nerve stimulation, responsive neurostimulation, or surgery.

Recovery Timeline

Most recovery happens in the first three months, with significant additional improvement during the first year. However, many people (especially those with moderate to severe injuries) continue having symptoms indefinitely. This is important for setting realistic expectations with clients and their families.

Movement Disorders: When Motor Control Breaks Down

Huntington's Disease: The Genetic Movement Disorder

Huntington's disease is a devastating hereditary condition caused by a mutated gene on chromosome 4. Because it's autosomal dominant, each child of an affected parent has a 50% chance of inheriting it. {{M}}It's like flipping a coin that determines whether you'll develop this disease{{/M}}. There's no way to reduce the odds through lifestyle changes.

The disease destroys cells in the caudate nucleus and putamen (parts of the basal ganglia), plus the cerebral cortex, cerebellum, and thalamus. Brain imaging can detect glucose problems and shrinkage in these areas years before symptoms appear.

Symptom progression typically follows this pattern:

1. Early stage (ages 30-50): Depression and mood swings often appear first. These aren't just reactions to having the disease; they're caused by brain changes
2. Middle stage: Short-term memory problems, poor concentration and judgment, chorea (jerky, uncontrollable movements in hands, face, limbs, and torso)
3. Late stage: Severe rigidity and bradykinesia (slowed movement), difficulty walking, speaking, and swallowing, possible neurocognitive disorder

Life expectancy after symptom onset is usually 10 to 30 years. There's no cure. Treatment focuses on managing symptoms and maintaining quality of life.

Parkinson's Disease: The Dopamine Disorder

Parkinson's disease results from both genetic and environmental factors. The core problem is degeneration of dopamine-producing cells in the substantia nigra, which reduces dopamine in the basal ganglia. But it's not just about dopamine. Low levels of acetylcholine, norepinephrine, and excessive glutamate activity also play roles in various symptoms.

The five primary motor symptoms (easy to remember as the "TRAP" plus one):

1. Tremor at rest. Starts in the hands with characteristic "pill rolling"
2. Rigidity in limbs and trunk
3. Akinesia. Sudden freezing episodes where voluntary movement becomes impossible
4. Postural instability. Balance and coordination problems
5. Bradykinesia. Slowed voluntary movement causing shuffling walk, reduced blinking, and mask-like facial expression

Non-motor symptoms include gastrointestinal problems, sleep disturbances, pain, loss of smell, anxiety, and depression. Up to 50% of people with Parkinson's experience depression at some point, and about 20% have depressive symptoms even before motor symptoms appear.

Treatment Options

Medications:

• Levodopa (first-line treatment): Converts to dopamine in the brain; best for bradykinesia, may help rigidity and tremor
• Dopamine agonists: Mimic dopamine at receptors; may delay progression and have fewer long-term side effects like dyskinesias

Deep brain stimulation (DBS): A surgical option when medications aren't working well enough. Electrodes implanted in the brain deliver electrical impulses to areas controlling motor symptoms. {{M}}The patient carries a programmable pulse generator (like a pacemaker for the brain){{/M}} under the skin in their chest and can turn it on when needed.

Seizures: When Electrical Activity Goes Wrong

A seizure is a temporary physical or behavioral change caused by abnormal electrical activity in the brain. {{M}}Think of it like an electrical surge that disrupts normal function{{/M}}. Circuits that usually work smoothly suddenly fire chaotically.

Provoked seizures have a known cause (brain injury, infection, stroke, fever, alcohol withdrawal). Unprovoked seizures occur without an identifiable trigger. When unprovoked seizures recur, the diagnosis becomes epilepsy.

Focal Onset Seizures: Starting in One Location

These begin in a specific area of one hemisphere:

Focal onset aware seizures (simple partial): Consciousness stays intact

Focal onset impaired awareness seizures (complex partial): Consciousness is altered, may start with an aura (warning sensation)

The symptoms depend entirely on where the seizure originates:

Jacksonian seizures are a type of simple partial frontal lobe seizure. They start with a localized motor seizure that "marches" to adjacent areas. Example: starts in a finger, then spreads to the hand, then the whole arm. | Parietal lobe | Tingling, numbness, pain; feelings of floating; body image distortions (feeling enlarged, shrunken, or missing body parts) | | Occipital lobe | Rapid blinking, eye fluttering; visual hallucinations (flashing lights, colored patterns); vision problems (partial blindness, blurred vision) |

Note that psychological stress frequently triggers temporal lobe seizures. Important to know when working with clients who have epilepsy.

Generalized Onset Seizures: Affecting Both Hemispheres

Generalized onset motor seizures (tonic-clonic, grand mal): These are what most people picture when they think "seizure." There's a tonic phase (muscles stiffen) followed by a clonic phase (rhythmic jerking). After regaining consciousness, the person may be depressed, confused, exhausted, and have no memory of the event.

Generalized onset non-motor seizures (absence seizures, petit mal): Very brief loss of consciousness with a blank stare, possibly rapid blinking. {{M}}From the outside, it might look like someone suddenly zoned out for a few seconds{{/M}}, but they've actually had a seizure.

Status Epilepticus: A Medical Emergency

Status epilepticus (SE) is when a seizure continues for 5+ minutes or multiple seizures occur without regaining consciousness between them. This is a true emergency.

• Generalized convulsive SE: Loss of consciousness with tonic-clonic seizures
• Non-convulsive SE: Seizure activity on EEG without obvious motor symptoms; may involve altered consciousness, delusions, hallucinations, automatisms, or language problems

Treatment involves benzodiazepines as the first-line medication, followed by anti-seizure medications if needed.

Migraine Headaches: More Than Just Pain

Migraines involve intense, throbbing pain (usually one-sided) often with nausea/vomiting and sensitivity to light or other stimuli. They're linked to low serotonin and abnormalities in glutamate, dopamine, and norepinephrine.

Migraine with aura (classic migraine): Preceded by warning signs like visual disturbances

Migraine without aura (common migraine): No warning signs

Common triggers include stress (or relaxation after stress), weather changes, alcohol, certain foods, skipping meals, and more. Physical activity and bending forward typically make them worse.

Treatment approaches:

• Preventive medications: Antidepressants (amitriptyline, fluoxetine), beta blockers, anti-epileptics
• Acute medications: NSAIDs, acetaminophen, triptans (like sumatriptan)

Hypertension: The Silent Killer

Primary (essential) hypertension accounts for 90% of cases and has no known physiological cause. It's called the "silent killer" because it often has no symptoms while silently damaging blood vessels and organs. Remember, it's also the leading risk factor for strokes.

Secondary hypertension is caused by a known disease.

Risk factors include obesity, tobacco use, excessive salt, stress, being male, older age, African American race, and family history.

Treatment emphasizes lifestyle changes plus possible medications (diuretics, beta blockers, ACE inhibitors) and biofeedback or relaxation training.

Endocrine Disorders: When Hormones Go Wrong

Adrenal Disorders

Addison's Disease: Undersecretion of corticosteroids (adrenal insufficiency). Symptoms: apathy, weakness, irritability, depression, GI disturbance.

Cushing's Disease: Oversecretion of corticosteroids. Symptoms: weight gain, moon face, mood swings, depression, anxiety.

Thyroid Disorders

The thyroid gland controls metabolism. Think of it as your body's thermostat and energy regulator.

Hyperthyroidism (too much thyroid hormone):

• Increased metabolism, elevated temperature, heat intolerance
• Increased appetite with weight loss
• Racing heart, insomnia
• Emotional instability, reduced attention

Hypothyroidism (too little thyroid hormone):

• Decreased metabolism, lowered temperature, cold intolerance
• Reduced appetite with weight gain
• Slowed heart rate
• Depression, lethargy, decreased libido
• Confusion, impaired concentration and memory

EPPP HINT: Thyroid disorders are one of the first medical disorders to suspect when there are psychiatric symptoms. Hyperthyroidism mimics anxiety or mania. Hypothyroidism mimics depression.

The most common form of hyperthyroidism is Grave's disease. Severe cases can even involve hallucinations and delusions.

Pituitary Disorders: Diabetes Insipidus

The pituitary releases antidiuretic hormone (ADH), which controls water excretion in urine. When ADH is too low (due to tumor, infection, stroke, or surgery), it causes central diabetes insipidus (different from diabetes mellitus).

Symptoms include:

• Frequent and excessive urination
• Extreme thirst
• Dehydration, constipation
• Weight loss, low blood pressure

When the kidneys fail to respond to ADH, it's called nephrogenic diabetes insipidus.

Hypopituitarism (undersecretion of growth hormones): In children → dwarfism, pubertal delay. In adults → gonadal failure (impotence, infertility).

Hyperpituitarism (oversecretion of growth hormones): Causes gigantism (if before puberty) or acromegaly (if after puberty, enlarged hands, feet, face).

Pancreatic Disorders: Blood Sugar Problems

The pancreas controls blood glucose through insulin and other hormones.

Hypoglycemia (low blood sugar from too much insulin):

Progressive symptoms from mild to severe:

• Nervousness, shaking, sweating, hunger, dizziness, irritability
• Confusion, weakness, sleepiness, blurred vision
• Fast heartbeat, headaches
• Seizures, loss of consciousness

Can be caused by insulin overdose, skipping meals, excessive exercise or alcohol, liver disease, or adrenal/pituitary problems.

Diabetes mellitus (high blood sugar from too little insulin or insulin resistance):

Type 1 diabetes: Autoimmune disease destroying insulin-producing cells; genetic predisposition is the primary risk factor, can be triggered by viral infections

Type 2 diabetes: More common; insufficient insulin production or body can't use it properly; risk factors include genetics, being overweight, sedentary lifestyle, age over 45, certain racial/ethnic groups (Native Americans, African Americans, Hispanic/Latino Americans)

Gestational Diabetes: Develops during pregnancy in women without prior diabetes. Occurs in 1-3% of pregnancies. May precede development of Type 2 diabetes later.

The classic symptoms of diabetes are the "Three P's": Polyuria (increased urination), Polydipsia (increased thirst), and Polyphagia (increased appetite).

Common symptoms for both types:

• Extreme hunger and thirst
• Frequent urination
• Unexplained weight loss
• Fatigue, blurred vision
• Numbness/tingling in hands or feet
• Frequent infections

Alzheimer's Disease: The Three Stages

According to the 2011 NIA guidelines, Alzheimer's disease progresses through three stages:

1. Pre-clinical AD: Biomarkers indicate early disease, but no symptoms yet
2. Mild Cognitive Impairment (MCI) due to AD: Noticeable changes that don't affect daily activities
3. Dementia due to AD: Full clinical presentation

Key fact: Alzheimer's is now thought to begin up to 20 years before symptoms appear. This is why researchers are increasingly focused on early biomarkers and prevention.

Diagnostic Tools: How We See Inside the Brain

Electroencephalography (EEG)

EEG measures electrical impulses between neurons using small electrodes on the scalp. {{M}}It's like putting microphones on the outside of a concert hall to hear what's happening inside{{/M}}. You get information about groups of neurons near each electrode.

The computer records electrical activity as brain waves showing frequency and amplitude. EEG is useful for:

• Identifying rapid changes in brain activity in response to stimuli
• Diagnosing seizure disorders, brain injuries, tumors, sleep disorders
• Confirming brain death

Neuroimaging: Structural vs. Functional

Structural techniques reveal physical changes in the brain:

CT scan (computerized axial tomography):

• Uses x-rays to create images
• Fast, readily available in emergency rooms, less expensive
• Good for detecting density changes in brain tissue
• Downside: exposes patients to radiation

MRI (magnetic resonance imaging):

• Uses magnetic fields and radio waves (no radiation)
• More detailed three-dimensional images
• Can detect microhemorrhages, contusions, and scarring that CT misses
• Downsides: takes longer, requires staying very still, produces loud noise

DTI (diffusion tensor imaging):

• MRI-based technique for examining white matter tracts (the brain's "wiring")
• Detects abnormalities in how water molecules move along axons
• Used for TBI, concussion, neurocognitive disorders, schizophrenia, autism, epilepsy, multiple sclerosis

Functional techniques show brain activity by measuring glucose or oxygen consumption:

• PET (positron emission tomography): Uses radioactive tracers to measure activity; FDG-PET measures glucose metabolism and helps distinguish Alzheimer's from other neurocognitive disorders
• SPECT (single photon emission computed tomography): Also uses radioactive tracers
• fMRI (functional MRI): Uses magnetic fields and radio waves to measure blood flow

Important note: While neuroimaging helps with diagnosing neurocognitive disorders like Alzheimer's disease by ruling out other causes, these techniques aren't accurate enough to definitively diagnose Alzheimer's on their own.

Common Misconceptions to Avoid

1. "A TIA isn't serious because symptoms go away": Wrong. TIAs are medical emergencies and warning signs of major strokes to come.

2. "Huntington's symptoms are purely motor": Actually, depression and mood changes often appear years before movement problems and result from brain pathology, not just psychological reactions.

3. "Parkinson's is only about tremors": The disease involves multiple motor symptoms (tremor, rigidity, bradykinesia, postural instability, akinesia) plus significant non-motor symptoms including depression, which can precede motor symptoms.

4. "All seizures involve convulsions": Focal onset aware seizures don't affect consciousness at all, and absence seizures just look like brief staring spells.

5. "Diabetes insipidus and diabetes mellitus are related": They're completely different conditions. Diabetes insipidus involves ADH and water balance, while diabetes mellitus involves insulin and blood sugar.

6. "Psychological symptoms always indicate psychological disorders": Many neurological and endocrine conditions produce symptoms that look psychiatric (depression, anxiety, mood swings, cognitive problems). Always consider medical causes.

Medical conditions causing mood symptoms:

• Conditions that can cause mania: hyperthyroidism, Cushing's disease, MS, stroke, TBI
• Conditions that can cause depression: stroke, Huntington's, Parkinson's, TBI, hypothyroidism, Cushing's disease

Practice Tips for Remembering

For stroke symptoms, remember that the middle cerebral artery is most common and causes motor problems (hemiparesis/hemiplegia).

For Parkinson's motor symptoms, use "TRAP + B":

• Tremor
• Rigidity
• Akinesia
• Postural instability
• Bradykinesia

For thyroid disorders, think "hyper = high energy, hypo = low energy" and apply that to every symptom (metabolism, temperature, heart rate, mood, etc.).

For focal seizures by location:

• Temporal = Taste, Time distortions (déjà vu), Tummy sensations, Terrible fear
• Frontal = Fencing postures, Flailing movements
• Parietal = Pain and sensory changes, Perception of body distorted
• Occipital = Optical/visual symptoms

For distinguishing diabetes types, remember:

• Diabetes insipidus = "insipid" means bland or flavorless → dilute urine, excessive urination, thirst
• Diabetes mellitus = "mellitus" means honey-sweet → excess glucose (sugar) in blood and urine

Key Takeaways

• Strokes occur when blood flow to the brain is interrupted (ischemic) or an artery ruptures (hemorrhagic); symptoms depend on which artery is affected and appear on the opposite side of the body
• TBI causes anterograde amnesia (can't form new memories) and often retrograde amnesia (recent memories lost first); most recovery occurs in the first 3 months
• Huntington's disease is autosomal dominant with 50% inheritance risk; affects basal ganglia; progression goes from mood problems to chorea to severe motor impairment
• Parkinson's disease results from dopamine depletion in substantia nigra; five motor symptoms (TRAP + B); treated with levodopa, dopamine agonists, or deep brain stimulation
• Seizures can be focal (one hemisphere, localized symptoms) or generalized (both hemispheres); status epilepticus is a medical emergency
• Migraine headaches involve more than pain. They're linked to neurotransmitter abnormalities and have both preventive and acute treatment approaches
• Hypertension is often asymptomatic but is the leading risk factor for stroke
• Thyroid disorders produce symptoms that mimic psychiatric conditions (hyperthyroidism = high energy/anxiety-like; hypothyroidism = low energy/depression-like)
• Diabetes insipidus (ADH problem) and diabetes mellitus (insulin problem) are completely different conditions
• EEG measures electrical activity; structural imaging (CT, MRI, DTI) shows physical changes; functional imaging (PET, SPECT, fMRI) shows brain activity
• Always consider neurological and endocrine causes when clients present with psychological symptoms

Understanding these conditions will make you a better clinician and help you recognize when to refer clients for medical evaluation. For the EPPP, focus on distinguishing between similar conditions, knowing symptom patterns by location, and understanding treatment approaches.