Endocrine System Overview
The endocrine system regulates metabolism, growth, reproduction, and stress responses through hormone secretion.
Disorders often arise from hypo- or hypersecretion of hormones, receptor dysfunction, or autoimmune destruction.
Diabetes Mellitus
Types
Type 1: Autoimmune destruction of pancreatic beta cells → absolute insulin deficiency.
Type 2: Insulin resistance + relative insulin deficiency; linked to obesity and lifestyle.
Gestational Diabetes: Glucose intolerance during pregnancy.
Pathophysiology
Hyperglycemia due to impaired glucose uptake and increased hepatic glucose production.
Chronic hyperglycemia damages blood vessels → microvascular (retinopathy, nephropathy, neuropathy) and macrovascular (CAD, stroke) complications.
Clinical Manifestations
Polyuria, polydipsia, polyphagia, weight loss (Type 1), fatigue, blurred vision.
Long-term: poor wound healing, infections, neuropathy.
Management
Lifestyle: diet, exercise, weight control.
Medications: insulin (Type 1), oral agents/insulin (Type 2).
Technology: Continuous glucose monitors (CGM), insulin pumps, telehealth for monitoring.
Thyroid Disorders
Hypothyroidism
Causes: Hashimoto’s thyroiditis (autoimmune), iodine deficiency, thyroidectomy.
Pathophysiology: Low T3/T4 → slowed metabolism.
Symptoms: Fatigue, cold intolerance, weight gain, constipation, bradycardia, dry skin.
Complication: Myxedema coma (life-threatening).
Hyperthyroidism
Causes: Graves’ disease (autoimmune), toxic multinodular goiter.
Pathophysiology: Excess T3/T4 → increased metabolism.
Symptoms: Weight loss, heat intolerance, tachycardia, tremors, anxiety, exophthalmos (Graves).
Complication: Thyroid storm (acute, severe hyperthyroidism).
Management
Hypothyroidism: Levothyroxine replacement.
Hyperthyroidism: Antithyroid drugs, radioactive iodine, surgery.
Technology: EHR alerts for abnormal thyroid labs, patient portals for medication adherence.
Adrenal Disorders
Cushing’s Syndrome (Hypercortisolism)
Causes: Prolonged corticosteroid use, adrenal tumors, pituitary adenoma (Cushing’s disease).
Symptoms: Moon face, buffalo hump, truncal obesity, muscle weakness, hypertension, hyperglycemia.
Addison’s Disease (Adrenal Insufficiency)
Causes: Autoimmune destruction, infection, adrenal hemorrhage.
Symptoms: Fatigue, weight loss, hyperpigmentation, hypotension, hyponatremia, hyperkalemia.
Complication: Addisonian crisis (acute adrenal failure → shock).
Pheochromocytoma
Rare adrenal medulla tumor → excess catecholamines.
Symptoms: Episodic hypertension, palpitations, sweating, headaches.
Management
Cushing’s: Surgery, tapering steroids, medications to block cortisol.
Addison’s: Lifelong glucocorticoid/mineralocorticoid replacement.
Pheochromocytoma: Surgical removal, alpha/beta blockers pre-op.
Technology: Wearable BP monitors, telehealth for crisis prevention.
Quick Comparison Table
Disorder Hormone Imbalance Key Symptoms Major Complications
Type 1 Diabetes ↓ Insulin Polyuria, weight loss DKA, microvascular disease
Type 2 Diabetes Insulin resistance Fatigue, infections CAD, stroke, nephropathy
Hypothyroidism ↓ T3/T4 Fatigue, cold intolerance Myxedema coma
Hyperthyroidism ↑ T3/T4 Weight loss, tachycardia Thyroid storm
Cushing’s Syndrome ↑ Cortisol Obesity, hypertension Diabetes, osteoporosis
Addison’s Disease ↓ Cortisol/aldost Fatigue, hypotension Addisonian crisis
Pheochromocytoma ↑ Catecholamines Hypertension, palpitations Stroke, cardiac arrhythmia
Key Takeaway for Nursing Practice:
Endocrine disorders require vigilant monitoring, patient education, and integration of technology (EHRs, wearables, telehealth) to improve outcomes. Nurses play a critical role in recognizing early signs, preventing crises, and supporting long-term management.
