Age and demographic considerations

Pediatrics - Little People, Big Clues

• Age is a primary filter in pediatric differentials. Pathologies cluster in specific developmental stages, from congenital issues to adolescent concerns.

• Newborns (0-28d): Focus on congenital issues (cardiac, GI), TORCH infections, inborn errors of metabolism, and neonatal respiratory distress.
• Infants/Toddlers (1mo-3y): Think infections and ingestions. Bronchiolitis (RSV), croup, intussusception, foreign body aspiration. Febrile seizures peak at 6mo-5y.
• Children/Adolescents (4-18y): Strep pharyngitis, asthma, appendicitis, infectious mononucleosis, juvenile idiopathic arthritis (JIA).

⭐ Kawasaki Disease: A vasculitis of childhood. Suspect in a child <5 years with fever for ≥5 days plus CRASH symptoms.

📌 CRASH: Conjunctivitis, Rash, Adenopathy, Strawberry tongue, Hand/foot changes.

Young Adults - Prime Time Pathologies

• Autoimmune Onset: Multiple sclerosis, Crohn's disease, and SLE frequently manifest.
• First Major Psychiatric Episode: Schizophrenia and Bipolar I disorder (mania) classically present.
• Malignancies: Peak incidence for testicular germ cell tumors and Hodgkin lymphoma.
• Infections & Lifestyle: Sexually transmitted infections (e.g., HPV, HIV), substance use disorders, and trauma are prevalent.
• Reproductive Health: Ectopic pregnancy, Pelvic Inflammatory Disease (PID).

⭐ A painless testicular mass in a male aged 15-35 is considered testicular cancer until proven otherwise. It is one of the most curable solid cancers.

Middle Age - The 40+ Conundrum

Focus shifts from acute illnesses to the onset of major chronic diseases (40-65 years).

• Cardiovascular: Presume chest pain is cardiac. High suspicion for CAD, MI, HTN.
• Metabolic Syndrome: Screen for Type 2 DM (HbA1c), HLD, and central obesity.
• Malignancy: Age of peak incidence. Think colorectal, lung, breast (♀), prostate (♂). Adhere to screening protocols.
• Degenerative Disease: Osteoarthritis, spinal stenosis, vision/hearing loss.
• Mental Health: Mid-life crisis, depression, anxiety.

⭐ A patient >40 with new-onset diabetes and hypertension has a synergistic, not just additive, risk for atherosclerotic cardiovascular disease (ASCVD).

Geriatrics - Golden Year Riddles

• Atypical Presentations: Common diseases manifest differently. Suspect underlying illness with non-specific symptoms.

  • Infection: May present as delirium or a fall, often without fever.
  • Myocardial Infarction: Can be "silent" or present as confusion, syncope, or weakness instead of chest pain.

• Polypharmacy: Use of ≥5 medications. Always consider adverse drug events as a cause for new symptoms.

• Geriatric Giants: Common syndromes requiring a multifactorial approach.

  • Immobility
  • Instability (Falls)
  • Incontinence
  • Intellectual Impairment

⭐ A sudden change in functional status (e.g., a fall) is a red flag; it can be the primary sign of a severe underlying condition like pneumonia or an MI.

High‑Yield Points - ⚡ Biggest Takeaways

• Newborns are susceptible to congenital malformations and perinatal infections (e.g., TORCH, GBS).
• In infants, suspect inborn errors of metabolism with unexplained vomiting or lethargy.
• Adolescents frequently present with STIs, substance abuse, or psychiatric disorders.
• Autoimmune diseases typically emerge in young adults, particularly females.
• Cardiovascular disease and malignancy are top differentials in middle-aged and older adults.
• The elderly often have atypical presentations, polypharmacy issues, and cognitive impairment.